JP2823233B2 - Polyethylene terephthalate mixed yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polyester yarn exhibiting a bulky and highly drapeable fabric.

More specifically, heat shrinkage is different, and
The present invention relates to a polyethylene terephthalate mixed yarn comprising a polyethylene terephthalate yarn having a low birefringence in both component yarns.

[Conventional technology]

Polyester blended yarns composed of two-component yarns having different heat shrinkage rates have been known for a long time, and include bulky yarns (for example, Japanese Patent Publication No. 61-13009) and silky woven fibers (for example, Japanese Patent Application Laid-Open No. 55-57013). ).

In these prior arts, in order to cause a difference in heat shrinkage of both component yarns, one of them is a homopolymer,
A method of using the other as a copolymer or changing the drawing or heat treatment conditions of both component yarns is employed.

In order to increase the bulkiness by such a conventional method, when the high shrinkage component yarn is a copolymer, the ratio of the copolymerization component is increased, so that the softening temperature is lowered, and iron resistance is impaired. In order to obtain a high shrinkage component yarn from a homopolymer, it is necessary to stretch the yarn at a high magnification and a low temperature.

As the low shrinkage component yarn, polyethylene terephthalate having a birefringence (Δn) of 150 × 10 ⁻³ or more is used. Met.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester mixed fiber which can simultaneously exhibit high bulkiness and drape which are in a trade-off relationship with the conventional polyester mixed fiber.

[Means to solve the problem]

A polyethylene terephthalate yarn produced by a conventional spinning and drawing method usually has a birefringence of 150 × 10 ³ or more and a boiling water shrinkage of 5 to 10%.

The present inventors have conducted intensive studies on high-speed spinning of polyethylene terephthalate yarn, and found that polyethylene terephthalate yarn spun at a spinning speed of 6000 m / min or more has a high crystallinity and a birefringence of 130 × 10 ^{− The} boiling water shrinkage ratio is as low as 2 to 4% at ³ or less.
It was found that by applying the aqueous liquid before the filaments extruded from the spinneret were solidified, the crystallinity and the birefringence were low and the boiling water shrinkage was 5% or more. As a result of intensive studies on polyester mixed yarns obtained by combining the two component yarns obtained by high-speed spinning, the present invention has been reached. That is, the polyethylene terephthalate mixed fiber yarn of the present invention is a polyethylene terephthalate mixed fiber yarn composed of a low shrinkage component yarn and a high shrinkage component yarn, and is obtained by spinning both component yarns at a spinning speed of 6000 m / min or more. The low shrinkage component yarn has a boiling water shrinkage ratio of 4% or less, the high shrinkage component yarn has a crystallinity determined by X-ray diffraction method of 50% or less, and a birefringence outer layer in the cross section of the filament. The difference with the inner layer is 10 × 10 ^-3 or more, and the boiling water shrinkage is 5%
And the birefringence of both component yarns is 80 × 10 ^{-3 to} 13
It is a polyethylene terephthalate mixed yarn characterized by being 0 × 10 ⁻³ .

The mixed fiber of the present invention is formed by mixing a low shrinkage component yarn and a high shrinkage component yarn. The mixing ratio of the two component yarns is not particularly limited, but a range of 10 to 90% by weight is adopted as a range in which the bulkiness and the drape property are good.

In the present invention, the low shrinkage component yarn and the high shrinkage component yarn must be substantially formed of polyethylene terephthalate homopolymer. When the copolymer is used, not only the melting point is lowered and heat resistance is deteriorated, but also the color fastness is lowered. In the present invention, both the low shrinkage component yarn and the high shrinkage component yarn must have a birefringence of 130 × 10 ⁻³ or less. If it exceeds 130 × 10 ⁻³ , the drape property of the fabric will be poor. From the viewpoint of not impairing the mechanical properties of the fabric, the birefringence of both component yarns is preferably 70 × 10 ⁻³ or more, and most preferably 80 × 10 ^{−3 to} 120 × 10 ⁻³ .

The low shrinkage component yarn has a crystallinity (Xc) determined by X-ray diffraction measured by the method described below of about 50% or more. For yarns with a spinning speed exceeding 6000 m / min, Xc is approximately
Over 60%. Due to such high crystallinity, the boiling water shrinkage ratio is 4
% Or less, an extremely low shrinkage yarn is obtained. Such a highly crystalline yarn having a low birefringence exhibits extremely easy dyeability in dyeing.

The high shrinkage component yarn used in the present invention has a birefringence of 130 × 1.
0 ^-3 both a less, Xc is 50% or less, yet at the outer and inner layers birefringence difference measured by the transmission interference microscope described below [delta] ([Delta] n) is in the section of the filament 10
It has a difference of × 10 ^-3 or more.

The boiling water shrinkage of the high shrinkage component yarn needs to be 5% or more. If the boiling water shrinkage is less than 5%, the bulkiness of the fabric cannot be obtained. When it is 10% or more, the difference in boiling water shrinkage from the low shrinkage component yarn becomes large, and good bulkiness can be obtained. When the boiling water shrinkage is 15% or more, extremely high bulkiness can be obtained.

The high shrinkage component yarn used in the present invention does not cure the cloth after the appearance of bulkiness, and has excellent drapability, despite the high boiling water shrinkage.

If the birefringence exceeds 130 × 10 ⁻³ or Xc exceeds 50%, drape property cannot be obtained and the fabric has a hard feel. Xc
Is in the range of 20 to 40%, the bulkiness and drapability are best balanced without impairing the mechanical properties.

Furthermore, the high shrinkage component yarn of the present invention needs to have a birefringence difference δ (Δn) of 10 × 10 ³ or more between the outer layer and the inner layer in the cross section of the filament. δ (Δn) is 10
× is less than 10 ^-3, boiling water shrinkage case of more than 5% can not be obtained drapability.

When δ (Δ10) is 10 × 10 ⁻³ or more, the boiling water shrinkage ratio is 5
% Or more, a good drape property can be obtained. Even more surprisingly, when δ (Δn) is 10 × 10 ⁻³ or more, the mechanical properties of the high shrinkage component yarn are also improved. Specifically, the elongation becomes about 50% or less, and the same handling as ordinary spun drawn yarn becomes possible in the weaving process.

It is surprising that the elongation is about 50% or less in a low crystal and low orientation yarn having a crystallinity of 50% or less and a birefringence of 130 × 10 ⁻³ or less.

From the drapability and mechanical properties, the preferred δ (Δn) is
It is at least 20 × 10 ^−3, more preferably at least 30 × 10 ⁻³ .

The high shrinkage component yarn used in the present invention is also characterized by exhibiting easy dyeing properties comparable to the low shrinkage component yarn used in the present invention due to such a special microstructure.

Therefore, the polyethylene terephthalate mixed fiber yarn of the present invention solved at once a marbling-like dyeing spot based on a large difference in dyeability between the two component yarns, which is a problem with the conventional mixed fiber yarn.

The method for producing the polyethylene terephthalate mixed fiber of the present invention is as follows.

The low shrinkage component yarn is produced by spinning polyethylene terephthalate at a spinning speed of 6000 m / min or more using a known high-speed spinning method (for example, JP-A-57-89754).

The high shrinkage component yarn is produced by spinning at a spinning speed of 6000 m / min or more while applying an aqueous liquid and rapidly cooling before the yarn extruded from the spinneret in the high-speed spinning method is solidified.

The yarn temperature when applying the aqueous liquid is about 100 ° C. or higher. Below 100 ° C, Xc exceeds 50% and δ (Δn) is 10 × 1
0 becomes less than ^-3, a high shrinkage component yarn can not be obtained in the present invention.
As the aqueous liquid, a usual spinning oil or water can be used, and water is simply used. If the spinning speed is less than 5000m / min,
δ (Δn) is less than 10 × 10 ³ .

FIG. 1 shows a specific example of an apparatus for obtaining a high shrinkage component yarn of the present invention. In FIG. 1, a yarn 8 extruded from a spinneret 2 mounted on a spinning head 1 passes through a heating cylinder 3 provided below the spinneret, and is cooled by a cooling chamber 4 while being cooled.
The aqueous liquid is applied by the cooling nozzle 5 to be cooled and solidified. After the oil agent is applied by the oil supply nozzle 6, it is wound up by the winder 7 without stretching.

The polyethylene terephthalate mixed fiber of the present invention is obtained by combining a low shrinkage component and a high shrinkage component using a known blending machine and blending them by an air turbulence method (interlace) or the like.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to examples.

In the examples, the measurement of each characteristic was performed by the following method.

(Crystallinity) Using an X-ray diffractometer, set the thickness of the sample to about 0.5 mm and diffract 2θ each in the equator direction with respect to the fiber axis of the sample under the following conditions.
Drew a diffraction intensity curve from 7 ° to 35 °.

30KV, 80mÅ, scanning speed 1 ゜ / min, chart speed 10mm / min, time constant 1 second, receiving slit 0.3mm.

The three main reflections drawn in the range of 2θ = 17 ° to 26 ° are (100), (010), and (10) from the low angle side.
A diffraction intensity curve lying between 2θ = 7 ° and 35 ° is connected by a straight line and is set as a baseline. As shown in FIG. 2, a valley near 2θ = 20 ° is set as a vertex, connected by straight lines along the low-angle side and the high-angle side, and separated from a crystal part and an amorphous part.

(Birefringence index and birefringence difference) Using a transmission quantitative interference microscope manufactured by Carl Zeiss Jena Co., Ltd., using a green ray (wavelength 549 mμ), a refractive index n _〃 for light vibrating parallel to the fiber axis, from the value of the refractive index n _⊥ for light vibrating perpendicular to the fiber axis, the birefringence index at each point of the filament cross-section is measured at n _〃 -n _⊥.

When the radius of the filament cross section is R and the distance from the center (inner layer) of the cross section to the outer layer is x, the position where x / R is 0.9 is defined as the outer layer.

The birefringence difference δ (Δn) is represented by the difference between the birefringence of the outer layer and the birefringence of the inner layer.

The birefringence Δn referred to in the present invention was obtained by measuring n _〃 −n _ける at each point of x / R and by volume average.

(Boiling water shrinkage percentage) was measured length L ₁ under a load of 0.1 g / d to the fibers. Next, the fiber was subjected to boiling water treatment at 98 ° C. × 5 minutes without load, dried at 40 ° C. or less for 24 hours, and then subjected to a load of 0.1 g / d again to the fiber to obtain a length L ₂
Was measured. The boiling water shrinkage is represented by the following equation.

(Strength / Elongation) Measured with a TENSILON UTM-II-20 type tensile tester manufactured by Toyo Baldwin Co., at an initial length of 20 cm (however, the length after crimping was stretched) and a tensile speed of 20 cm / min.

(Bulkiness) The obtained multifilament was woven into a tubular knitted fabric, and the thickness of the knitted fabric was measured. Next, the knitted fabric is placed in 98 ° C. boiling water for 5 minutes.
After performing the boiling water treatment for minutes, the thickness was measured. The bulkiness was represented by the following equation using the thickness increase rate (%) of the knitted fabric.

If the rate of increase is 10% or more, it can be said that the bulkiness is good.

(Drapability) The tubular knitted fabric after the boiling water treatment of the bulkiness measurement was evaluated in three stages by a sensory test.

3: very soft (pass) 2: soft (pass) 1: hard (fail) (filament temperature) The filament temperature was measured in a non-contact manner along the spinning line using a scanning infrared thermometer.

(Dyeability) The knitted fabric is dyed with resolin blue (3% OWf).
Stained at 98 ° C for 1 hour.

The knitted fabric after dyeing was visually observed, and the presence or absence of marbling due to the difference in dyeing between the yarns was inspected. Those with no marbling were rated as good.

Example 1 A polyethylene terephthalate having [η] = 0.6 was spun at a spinning temperature of 300 ° C. using the apparatus shown in FIG. The spinning conditions were as follows.

Spinneret 0.3φ-24 Hole Heating cylinder temperature 200 ° C Cooling air 20 ° C, 0.3m / sec In spinning the low shrinkage component yarn, the spinning speed was 5000 Spinning was performed at 6000,7000,8000 m / min to obtain a 50 denier / 24f polyethylene terephthalate yarn. (These are A, B, C, and D.) In spinning the high shrinkage component yarn, as the aqueous liquid 5 in FIG. Cooling was performed while adding the amount. Yarn temperature is 120 ℃, 150 ℃, 180 ℃, 20
Spinning was performed at a spinning speed of 6000 m / min while water was applied at 0 ° C. to obtain a polyethylene terephthalate yarn of 50 denier / 24f. (Each of them is referred to as E, F, G, H.) Next, the yarns consisting of the groups A to D and the groups E to H were made into mixed yarns by using a normal interlacing and mixing machine. The obtained mixed fiber yarn was knitted by a one-necked knitting machine to obtain a knitted fabric having a basis weight of about 200 g / m ² . The knitted fabric is dyed at 98 ° C. with the dye resolin blue (3% OW).
Stained for hours. Table 1 shows the physical properties of the original yarn, and Table 2 shows the evaluation results of the knitted fabric of the mixed yarn.

[Effect of the Invention] Since the polyethylene terephthalate mixed fiber of the present invention is configured as described above, a knitted fabric using the mixed fiber exhibits extremely high bulkiness and drapeability by heat treatment. It is useful for women's clothes such as blouses and dresses.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an example of a spinning apparatus for obtaining a mixed fiber of the present invention. DESCRIPTION OF SYMBOLS 1 ... Spinning head, 2 ... Spinner, 3 ... Heating cylinder, 4 ... Cooling chamber, 5 ... Aqueous liquid application nozzle, 6 ... Oil supply nozzle, 7 ... Winder, 8 ... Thread. FIG. 2 is a diagram showing an example of an X-ray diffraction curve.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D01F 6/62

Claims (1)

(57) [Claims] 1. A polyethylene terephthalate mixed fiber comprising a low shrinkage component yarn and a high shrinkage component yarn, wherein both of the component yarns are undrawn yarns obtained by spinning at a spinning speed of 6000 m / min or more. The shrinkage component yarn has a boiling water shrinkage ratio of 4% or less, the high shrinkage component yarn has a crystallinity determined by X-ray diffraction method of 50% or less, and the difference in birefringence between the outer layer and the inner layer in the filament cross section is 10%. × 10 ^-3 or more, and the boiling water shrinkage is 5% or more, and the birefringence of both component yarns is 80 × 10 ^-3.
Polyethylene terephthalate mixed fiber having a size of up to 130 × 10 ^-3 .