JP3224338B2 - Composite false twisted yarn with lightness - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention, which relates to the composite false twisted textured yarn having a lightness, more particularly, along the longitudinal direction of the filaments, including hollow filaments the hollow state exhibits a pulsing state, those concerning the composite false twisted textured yarn having a lightness.

[0002]

2. Description of the Related Art Conventionally, hollow fibers have been used for imparting various functions including antistatic properties (for example, Japanese Patent Publication No. 60-56802).

[0003] Such hollow fibers have a coarse hardness due to a larger apparent diameter than solid fibers of the same denier,
When used for clothing, various higher-order processing was required.

However, for example, when the hollow fiber is false-twisted, the hollow portion is crushed, so that not only the coarse hardness cannot be improved, but also the function imparted has been impaired.

On the other hand, a method is known in which two or more filament yarns having a difference in elongation are aligned and entangled, followed by false twisting to obtain a bulky, double-layer yarn having an excellent warm feeling. (For example, Japanese Patent Publication No. 60-11130)
And Japanese Patent Publication No. 61-19733.

[0006] However, the above-mentioned double-layered yarn is excellent in bulkiness, but has a large holding weight, and has a double-layered structure, which has a soft feel and a lightweight feeling. The reality was that composite false twisted yarns could not be obtained.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite false twisted yarn having a soft feel and an excellent lightness, which solves the above-mentioned drawbacks of the prior art. It is in.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, among at least two types of filament yarns having a difference in elongation, a filament yarn having a larger elongation has a hollow. When the composite filament was false-twisted under specific conditions using a filament, the hollow state was pulsed to obtain a desired composite false-twisted yarn.

That is, according to the present invention, there is provided a composite false twisted yarn in which at least two types of filament yarns having a yarn foot difference are combined with a yarn foot difference between the yarns. The larger filament yarn is in the longitudinal direction
Along with the hollow ratio fluctuates in the range of 20-80%
In both cases, the maximum hollow ratio is 1.5 to 2.
The hollow state is composed of pulsated hollow filaments in the range of 5 times , and (b) the phase of the pulsing state is different between the filaments, while (c) any of the composite false twisted yarns In the cross section, at least three types of hollow filaments selected from hollow filament yarns having the following cross-sections are mixed together. Cross-section where hollow ratio is substantially maintained Cross-sectional shape before false twisting is maintained, while hollow ratio is increased due to increased cross-section false twisting, and hollow ratio is increased from that before false twisting The cross section is flattened by the false twisting process, and the hollow ratio is reduced from that before the false twisting process. An intermediate cross section between the cross sectional shape before the false twisting process and the flat cross section is provided.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail.

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

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

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

Further, the false-twisted composite yarn is subsequently heat-treated by a second heater (11) via a delivery roller (10), and is cheese-treated by a take-up roller (12) into a winder (13). It is wound up as 14).

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

The hollow rate of the hollow filament is 20%.
When the hollow ratio is less than 20%, pulsing in the hollow state in the longitudinal direction of the filament does not sufficiently occur. However, if the hollow ratio is too large, fibrils are likely to be generated, resulting in a decrease in weaving properties and the like.

The above hollow filaments can be produced by a conventionally known method, and among them, polyester hollow filaments are preferred.

In the above false twisting, the stretching ratio is set to 1.
3 or less, and the yarn temperature at the outlet of the false twist heat setting heater is 7
It is necessary to be 0-100 degreeC.

When the stretching ratio exceeds 1.3, fluff is frequently generated, and the processability is lowered, and the quality of the woven fabric is lowered. However, if the stretch ratio is too low, dye spots will occur, so it is preferable to limit the draw ratio to about 1.1 at most.

If the yarn temperature at the outlet of the heat set heater of the false twist is lower than 70 ° C., the twisting tension becomes too high, and this causes the occurrence of staining spots and irritation. On the other hand, when the yarn temperature is 10
When the temperature exceeds 0 ° C., the crimp ratio becomes too high, and the obtained woven fabric has a rich texture.

The yarn temperature at the outlet of the false twist heat setting heater is set to 70.
To reach ~ 100 ° C, the heater temperature should be 90-130 ° C
The heating may be performed for 0.15 to 0.23 seconds.

The heat treatment in the second heater (11) may be performed under such conditions that the resulting composite false twisted yarn has a boiling water shrinkage of 5 to 15%. A temperature of 150 ° C. or higher is required.

However, if the temperature is too high, fusion between the filaments and the like may occur.
It is preferable to keep the temperature at about ° C.

As shown in FIG. 1 (a), the false twisted and heat-treated composite false twisted yarn under the above-described conditions has portions M and M 'having fine winding in a substantially straight filament.
Are scattered, and the hollow state of each hollow filament is pulsing while making the phases different from each other. Therefore, as shown in FIG. At least three types of hollow filaments selected from among the hollow filament yarns have been mixed, and have a completely new feeling and excellent lightness different from the conventional composite false twisted yarn shown in FIG. 1 (b). Show. A cross-section in which the cross-sectional shape and the hollow ratio before the false twisting are substantially maintained The cross-sectional shape before the false twisting is maintained, while the cross-section in which the hollow ratio is increased is flattened by the false twisting, and the hollow ratio is temporarily reduced. Cross section increased from that before twisting Cross section flattened by false twisting, and hollowness decreased 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 easy to elongate, while the low elongation filament (1) is hard to elongate. Is wound around the hollow filament (2), and the hollow filament (2) is stretched by the length required for winding.

Since the hollow filament (2) is stretched while being twisted, the air existing in the hollow portion is extruded in the longitudinal direction of the filament, and the hollow portions are separated from each other within a hollow ratio of 20 to 80%. A pulsing state in which the fluctuation is repeated while changing the phase is obtained.

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 the false twisting.

If the magnification is less than 1.5, pulsing does not occur sufficiently, and an excellent lightweight feeling may not be achieved. On the other hand, when the magnification exceeds 2.5 times,
The hollow ratio becomes too large, and fibrils are easily generated, which may cause a decrease in weaving properties .

Further, in the above-described composite false twisted yarn, the yarn foot difference between the core yarn and the sheath yarn is preferably 30 to 50%.

When the yarn foot difference is less than 30%, the composite false twisted yarn does not exhibit a two-layer structure, and the hollow portion is crushed to a large extent, so that the pulsing state may not be exhibited. On the other hand, if the yarn foot difference exceeds 50%, uniform stretching becomes difficult, which may result in defects such as staining spots and stripes.

[0031]

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

(1) Yarn foot difference Take out 50 cm of the composite bulked yarn, and add 0.2 g to one end of the yarn.
/ Hang a denier load. Next, add 5 to the middle part of the yarn.
A single mark is made at intervals of cm, and this part is cut out to obtain a sample.

From the sample, 10 hollow filament yarns in the sheath and 10 filaments in the core were taken out, and 1/30
The length is measured by suspending a load of g / denier.

Assuming that the average lengths of the sheath filament and the core filament are 1 _A and 1 _B , respectively, the yarn foot difference is represented by the following equation. Yarn foot difference (%) = (l _B -l _A ) / l _A × 100 Measurement was carried out 10 times, and the result was represented by an average value.

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

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

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

(3) Cross Sectional Shape of Hollow Filament in Arbitrary Cross Section of Composite False Twisted Yarn A cross-sectional micrograph (500 × magnification) of the composite false twisted yarn is shown in FIG.
Photographs were taken arbitrarily at 20 places, and the cross-sectional shape of the hollow filament was observed.

(4) Hollow Ratio of Hollow Filament In the above cross-sectional photograph, the hollow ratio of all hollow filaments was measured, and this was taken as the range of the hollow filament hollow ratio. In addition, the largest value among them was defined as the maximum hollow ratio.

(5) Texture and Lightness of Composite False Twisted Yarn The obtained composite false twisted yarn is knitted by a tubular knitting machine, and the wind of the knitted fabric after refining, dyeing and final setting according to a conventional method. The combination (soft feeling) and lightness (holding weight) were sensory-determined by five skilled persons.

The judgment is 1 (poor) to 5 (extremely good).
Expressed in stages.

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

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

Next, the two filament yarns were supplied to the false twisting apparatus shown in FIG. 3, and were led to and entangled with the 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 at 105 ° C.
And the yarn temperature at the outlet of the heater was set to 90 ° C., and guided to a triaxial friction false twisting device rotating at a surface speed of 630 m / min. Stretching false twisting was performed 25 times at a processing speed of 350 m / min.

Further, the composite false twisted yarn was guided to a second heater at 200 ° C. at an overfeed rate of 0% and subjected to a heat treatment, then wound around a winder, 130 denier / 24 filaments, and a boiling water shrinkage of 9%. Was obtained.

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

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 having the following cross sections were mixed, and the hollow filament was mixed. The pulsing was performed while having a phase difference. A cross-section in which the cross-sectional shape and the hollow ratio before the false twisting are substantially maintained The cross-sectional shape before the false twisting is maintained, while the cross-section in which the hollow ratio is increased is flattened by the false twisting, and the hollow ratio is temporarily reduced. Cross section increased from that before twist processing Flattened by false twist processing and hollow ratio decreased from that before false twist processing Intermediate cross section between cross sectional shape before false twist processing and flat cross section The hollowness of the filament was in the range of 40-70%.

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

The knitted fabric was dyed in an extremely dark color as compared with a normal false twisted yarn.

[Examples 2 and 3, Comparative Examples 1 and 2]
In Example 1, except that the conditions for false twisting were changed as shown in Table 1, the same procedure was performed as in Example 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 and 4 The same as Example 1 except that the hollowness and 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]

According to the present invention, a dyed polyester composite false twisted yarn having a soft, novel feel and excellent lightness can be obtained. Etc. can be suitably used for black formal uses.

[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 the 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]

 DESCRIPTION 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 device 10 Delivery roller 11 Second heater 12 Take-off roller 13 Winder 14 cheese

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI D06B 1/04 D06B 1/04 (56) References JP-A-3-137237 (JP, A) JP-A-7-118793 (JP) JP-A-4-281028 (JP, A) JP-A-9-59834 (JP, A) JP-A-9-111583 (JP, A) JP-A-1-92440 (JP, A) 4-202821 (JP, A) JP-A-8-49130 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 1/00-3/48 D02J 1/00-13 / 00

Claims (5)

(57) [Claims] 1. A composite false twisted yarn in which at least two types of filament yarns having a yarn foot difference are combined with a yarn foot difference between the yarns, (a) a filament yarn having a larger yarn foot difference is , Longitudinal direction
Along with the hollow ratio fluctuates in the range of 20-80%
In both cases, the maximum hollow ratio is 1.5 to 2.
The hollow state is composed of pulsated hollow filaments in the range of 5 times , and (b) the phase of the pulsing state is different between the filaments, while (c) any of the composite false twisted yarns In a cross section, a composite false twisted yarn having a light feeling, wherein at least three kinds of hollow filaments selected from hollow filament yarns having the following cross sections are mixed. The cross-sectional shape before the false twisting and the hollow ratio are substantially maintained. The cross-sectional shape before the false twisting is maintained, while the hollow ratio is flattened by the increased cross-sectional false twisting, and the hollow ratio is temporarily reduced. Cross-section increased by false twisting before twisting and flattened, and hollowness decreased from that before false twisting Intermediate cross-section between cross-sectional shape before false twisting and flat cross-section 2. The lightweight false twisted composite yarn according to claim 1, wherein the yarn foot difference is in the range of 30 to 50%. 3. A double-layered yarn in which the composite false twisted yarn has a core-sheath structure.
The composite false twist having a light feeling according to claim 1 or 2.
Processing thread. 4. A method in which an interlaced portion exists between a core yarn and a sheath yarn.
The composite false twisted yarn having a lightweight feeling according to claim 3. 5. The polyester fiber according to claim 1, wherein the core yarn and the sheath yarn are both polyester fillers.
The composite false twist having lightness according to claim 3, wherein the false false twisting is performed.
Thread.