JP2002180332A - Polyester-based conjugated yarn, method for producing the same and fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a polyester-based conjugated yarn exhibiting high bulkiness and excellent crimp-developing ability and capable of obtaining excellent high- quality fabric, scarcely developing Yoryu-like (purple willow) crepe even when the yarn is twistless or soft twist yarn and excellent in soft stretchability. SOLUTION: The polyester-based conjugated yarn is characterized in that the yarn is a multifilament composed of a conjugated fiber. The conjugated fiber is obtained by laminating two kinds of polyester-based polymers A and B side by side in the direction of fiber length. The polyester-based polymer A is a polyester mainly consisting of polytrimethylene terephthalate and the polyester-based polymer B is a fiber-forming polyester and the cross section of the conjugated fiber has a flat shape having a conjugate interface in the minor axis direction and the outer periphery of the polyester-based polymer B has a nearly circular shape and the outer periphery of the polyester-based polymer A has a nearly elliptical or square shape and ovality represented by a ratio of the minor axis to the major axis of cross section is 1.3 to 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides a soft stretch property when formed into a fabric due to its excellent crimp developing ability, and because it is non-torque, it is difficult for grain and wrinkles to appear, and it has a soft and resilient texture. Further, the present invention relates to a polyester-based composite yarn capable of imparting excellent coloring properties and aesthetics to a special modified cross section.

[0002]

2. Description of the Related Art Polyester has various excellent properties such as mechanical properties, and is widely used not only for clothing. In addition, various methods have been adopted in order to impart a stretch property to the polyester-based fabric by a recent stretch boom.

For example, there is a method in which polyurethane elastic fibers are mixed in a woven fabric to impart stretchability. However, when polyurethane-based fibers are mixed, the texture is hard as an inherent property of polyurethane, the texture and drape property of the fabric are reduced, and the disperse dye for polyester is hardly dyed, which causes a problem of contamination. This not only complicates the dyeing process, such as strengthening the reduction washing, but also makes it difficult to dye a desired color.

There is also a method of imparting stretchability to a woven fabric by subjecting a polyester fiber to false twisting and using a fiber exhibiting twisting / untwisting torque. However, the false twisted yarn has a problem that it has a sensation of sensation, and the torque tends to be easily transferred to the grain on the surface of the woven fabric, which is likely to be a defect of the woven fabric. For this reason, a torque balance is achieved by heat treatment or S / Z twist to balance the stretchability and the defects caused by the grain formation, but the problem is that the stretchability is generally too low. .

On the other hand, as a method using no polyurethane fiber or false twisted yarn, various types of latently crimp-expressing polyester fibers using a side-by-side composite have been proposed. Latent crimp-expressing polyester fiber has the ability to develop crimp by heat treatment or to develop finer crimp than before heat treatment, and is distinguished from ordinary false twisted yarn .

For example, JP-B-44-2504 and JP-A-4-308271 disclose a side-by-side composite yarn of polyethylene terephthalate (hereinafter abbreviated as PET) having an intrinsic viscosity difference or an intrinsic viscosity difference.
Japanese Patent Publication No. 295634 describes a side-by-side composite yarn of homo PET and copolymer PET having higher shrinkage. If such a latently crimp-expressing polyester fiber is used, it is possible to obtain a certain degree of stretchability, but the stretchability when woven is insufficient.
There was a problem that it was difficult to obtain a satisfactory stretchable fabric. This is because the side-by-side composite yarn as described above has a low crimp development ability under the constraint of the fabric, or the crimp is easily set by external force. The side-by-side composite yarn does not use the stretch property due to the expansion and contraction of the fiber itself like the polyurethane fiber, but uses the expansion and contraction of the three-dimensional coil caused by the difference in the shrinkage ratio between the composite polymers for the stretch property. For this reason, for example, when heat treatment is performed under a woven fabric constraint in which the shrinkage of the polymer is restricted, the heat fixation is performed as it is, and the shrinkage ability is further lost.

Further, Japanese Patent Publication No. 43-19108, Japanese Patent Application Laid-Open No. 2000-239927, and Japanese Patent Application Laid-open No. 2000-25
No. 6918 describes a side-by-side composite yarn using polytrimethylene terephthalate or polybutylene terephthalate. By using the methods described in these publications, an appropriate stretch property can be imparted. However, since the coil crimps between the single fibers have a strong tendency to associate with each other, wrinkles are likely to be formed on the surface of the fabric, or a willow-shaped grain is formed. Etc. are expressed. In addition, when the present inventors supplemented the method described in Japanese Patent Publication No. 43-19108, it was found that spots were generated due to thread spots which seemed to be caused by a low spinning speed, and the quality was poor.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a conventional polyester-based latently crimpable fiber or false twisted yarn which has good spinning properties such as spinning and drawing, does not cause dye contamination which is a problem when mixed with polyurethane. Improve the crimp expression ability under the constraint of the woven fabric, which is a problem, and have excellent stretchability, low appearance of grain and wrinkle, and good color development, and high quality fabric with less occurrence of dye spots. The present invention provides a polyester composite yarn that can be obtained.

[0009]

To solve the above-mentioned problems, the present invention adopts the following constitution. That is, (1) in a composite fiber in which two kinds of polyester polymers A and B are bonded in a side-by-side type along the fiber length direction, the polyester polymer A is a polyester mainly composed of polytrimethylene terephthalate. The polyester polymer B is a fiber-forming polyester, the cross-sectional shape of the composite fiber is a flat shape having a composite interface in the minor axis direction, the outer shape of the polyester polymer B is substantially circular, A multifilament composed of a conjugate fiber in which the outer shape of the polyester-based polymer A is substantially elliptical or substantially square and the flatness represented by the ratio of the major axis / minor axis of the cross section is 1.3 to 6. Polyester composite yarn characterized by the following.

(2) The temperature at which the maximum shrinkage stress is 110
℃ or more and the maximum value of the shrinkage stress is 0.15 cN / dt
ex or more, the polyester-based composite yarn according to the above (1).

(3) The polyester composite yarn according to the above (1) or (2), wherein the Worcester spot U% is 2.0% or less.

(4) The method according to any one of the above (1) to (3), wherein the stretch ratio after heat treatment is 30% or more, and the stretch modulus is 85% or more. Polyester composite yarn.

(5) The polyester composite yarn according to any one of (1) to (4), wherein the bulkiness is 30 cc / g or more.

(6) The polyester composite yarn according to any one of (1) to (5), wherein the CF value is 5 to 100.

(7) The polyester composite yarn according to any one of the above (1) to (6), which contains particles having an average particle size of 0.01 to 2 μm in an amount of 0.1% by weight or more. .

(8) The polyester composite yarn according to any one of (1) to (7), wherein the minimum value of the differential Young's modulus at an elongation of 3 to 10% is 15 cN / dtex or less. .

(9) Elongation at break after boiling water treatment is 100%
The polyester-based composite yarn according to any one of the above (1) to (8), wherein:

(10) Any one of the above (1) to (9), wherein the polyester polymer B is a polyester mainly composed of polytrimethylene terephthalate.
Item 7. The polyester composite yarn according to Item 1.

(11) The polyester composite yarn according to any one of (1) to (9), wherein the polyester polymer B is a polyester mainly composed of polybutylene terephthalate.

(12) A polyester mainly composed of polytrimethylene terephthalate is arranged in the polyester polymer A, and a fiber-forming polyester is arranged in the polyester polymer B. When the composite spinning is performed, each intrinsic viscosity (I
V) forms a composite flow by a combination satisfying the following formulas (1) to (3), and discharges the composite flow from the slit such that the minor axis direction of the slit is a composite interface, and after passing through a cooling zone,
The yarn is drawn at a spinning speed of 1000 m / min or more, and subsequently drawn at a draw ratio of 65% or more of the maximum draw ratio.
A method for producing a polyester-based composite yarn, comprising winding after heat treatment at 10 ° C or higher.

0.30X ≦ Y ≦ 0.45X + 0.30 (1) 0.45 ≦ Y (2) 0.8 ≦ X ≦ 2.0 (3) (where Y : Intrinsic viscosity of polyester polymer B (I
V) X: Intrinsic viscosity (IV) of polyester polymer A (13) After stretching, the relaxation rate is continuously 3 to 15%.
(12) The method for producing a polyester-based composite yarn according to the above (12), wherein the relaxation treatment is performed.

(14) The winding tension in the stretching step is 0.05
cN / dtex or less.
2) or the method for producing a polyester composite yarn according to (13).

(15) The non-twisted or medium-twisted polyester composite yarn according to any one of (1) to (11) having a twist coefficient K of 0 to 10000 is used at least in part. A cloth characterized by the following.

(However, twist coefficient K = T × D ^0.5 T: number of twists per 1 m of yarn length D: yarn fineness (dtex))

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The composite fiber constituting the polyester composite yarn of the present invention has a specific shape in which two or more types of polyester polymers having different viscosities are bonded in a side-by-side type along the fiber length direction. The fiber has a flat cross section. By making the polymers having different viscosities into the composite form, stress is concentrated on the high viscosity side during spinning and drawing, so that the internal strain differs between the components. Therefore, the high-viscosity side largely shrinks due to the difference between the elastic recovery rate after the stretching and the difference in the heat shrinkage rate in the heat treatment step of the fabric, causing distortion within the single fiber to take a form of a three-dimensional coil crimp. The diameter of the three-dimensional coil and the number of coils per unit fiber length may be determined by the difference in shrinkage between the high shrinkage component and the low shrinkage component (the value obtained by adding the difference between the elastic recovery rate and the heat shrinkage rate). The larger the shrinkage difference, the smaller the coil diameter and the larger the number of coils per unit fiber length.

The coil crimp required as a stretch material has a small coil diameter, a large number of coils per unit fiber length (excellent elongation characteristics, good appearance), and good coil set resistance (expansion and contraction). The set amount of the coil according to the number of times is small and the stretch retention is excellent), and the hysteresis loss at the time of recovery from the extension of the coil is small (excellent elasticity and good fit). While satisfying these requirements, by having the properties as polyester, for example, moderate tension, drape, high color fastness,
Stretch material with excellent total balance can be obtained.

Here, in order to satisfy the above-mentioned coil characteristics, a high shrinkage component (a polyester polymer A in the present invention) is used.
Is important. As for the expansion and contraction characteristics of the coil, since the expansion and contraction characteristics of the high shrinkage component with the low shrinkage component as the fulcrum are dominant, the polymer used for the high shrinkage component is required to have particularly high extensibility and recoverability. The present inventors have conducted intensive studies in order to satisfy the above-mentioned properties without impairing the properties of the polyester. As a result, the polyester polymer A uses a polyester mainly composed of polytrimethylene terephthalate (hereinafter abbreviated as PTT). I found that. PT
The T-fiber has mechanical properties and chemical properties equivalent to those of typical polyester fibers such as polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate (hereinafter abbreviated as PBT) fibers, and has an elongation recovery property. Is extremely excellent. This is because in the PTT crystal structure, the methylene chain of the alkylene glycol moiety has a Gauche-Gauche structure (the molecular chain is bent at 90 degrees), and further, the interaction between benzene rings (stacking, parallel).
Due to the low binding point density and high flexibility, the rotation of the methylene group allows the molecular chain to easily elongate.
Think to recover.

Here, the PTT of the present invention is a polyester obtained by using terephthalic acid as a main acid component and 1,3-propanediol as a main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. As the copolymerizable compound, for example, isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimeric acid, sebacic acid, 5-
Dicarboxylic acids such as sodium sulfoisophthalic acid,
Examples thereof include, but are not limited to, diols such as ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol.

The low-shrinkage component (polyester-based polymer B in the present invention) of the present invention is a fiber-forming polyester having good interfacial adhesion to PTT, which is a high-shrinkage component, and having a stable thread-forming property. If there is, it is not particularly limited.
However, in consideration of mechanical properties, chemical properties, and raw material prices, PTT, PET, and PBT having a fiber forming ability are preferable. Furthermore, polyester polymer A (high shrinkage component)
PTT and PBT are more preferred in that by adjusting the melting point and the glass transition point of the above, stress can be concentrated on the higher shrinkage component in the spinning step, and the difference in shrinkage ratio can be increased. Also, PT
Since T and PBT can lower the Young's modulus of the fiber, there is also an advantage that a crimped yarn that is softer and excellent in elasticity can be obtained.

Further, in order to improve the processability (action as a lubricant) in yarn production or textile processing, and to improve the transparency and color development (formation of microcraters), polyester-based polymer A and / or polyester-based polymer are used. Titanium dioxide having an average particle size of 0.01 to 2 μm, silica, alumina,
It is preferable to contain fine particles such as kaolinite and calcium carbonate in an amount of 0.1% by weight or more. A more preferable content of the fine particles is 0.3 to 3.0% by weight. Further, a hindered phenol derivative, a coloring pigment, or the like may be added as an antioxidant. The viscosity referred to in the present invention is the intrinsic viscosity (I
V) is a value measured by dissolving a sample in orthochlorophenol.

The composite fiber of the present invention needs to have a flat cross section having a specific shape, as shown in one embodiment of FIG. Two types of polyester polymer A
(Open area in the figure) and polyester-based polymer B (hatched area in the figure) have a flat shape having a composite interface in the minor axis direction, and the outer shape of the polyester-based polymer B is substantially circular. It is necessary to make a side-by-side composite cross section in which the outer shape of the system polymer A is substantially elliptical or substantially square. The flat cross-section yarn is different from the round cross-section yarn in that it has a cross-sectional anisotropy with respect to bending, and has characteristics such that it is easy to bend in the short axis direction of the flat cross section and hard to bend in the long axis direction. For this reason, when a composite interface is provided in the short axis direction as in the present invention, a bending occurs due to a difference in shrinkage in a direction of high bending stiffness, so that a twist is added to the coil crimp. Therefore, coil crimps do not easily associate with each other in the single fibers constituting the composite yarn, and the crimps are developed independently of each other. For this reason, the bulk height is high and while giving a moderate swelling,
A soft and resilient fabric can be obtained.

Further, since the crimping phase is shifted between the adjacent fibers, the effect of dispersing the torque due to the coil crimping can be enhanced. Therefore, even in the non-twisting to the sweet twisting, there is almost no rise of a willow-like grain, and a flat, high-quality cloth without wrinkles can be obtained.

Further, the outer shape of the polyester-based polymer B is made substantially circular, and the outer shape of the polyester-based polymer B is made substantially elliptical or substantially square to form an asymmetric cross-section, which is bonded side by side. As shown in FIG. 2A, a random arrangement of the cross section is possible as the composite yarn.
Therefore, an effect of suppressing that the crimped phases once shifted are aligned again (rearrangement of the cross section) can be obtained. Further, the flatness expressed by the ratio of the major axis / minor axis of the cross section, while providing the above-described phase shifting effect, is a processability in yarn production and textile processing,
In order to satisfy mechanical properties such as strength and good color development,
It is necessary to be 1.3 to 6. Flatness is 1.4 ~
4 is preferable, and 1.5 to 2.5 is more preferable.

The composite ratio between the two components is in the range of high shrinkage component: low shrinkage component = 70: 30 to 35:65 (% by weight) in view of the spinning properties and the dimensional homogeneity of the coil in the fiber length direction. Is preferable, and the range of 60/40 to 45/55 is more preferable.

Further, in order to overcome the cloth restraining force and stably develop the coil crimp, the shrinkage stress and the temperature at which the shrinkage stress reaches a maximum are important characteristics. The higher the shrinkage stress, the better the crimp development under the constraint of the fabric, and the higher the temperature at which the maximum shrinkage stress is, the easier the handling in the finishing step. Therefore, in order to enhance the crimp development in the heat treatment step of the fabric, the temperature at which the maximum of the shrinkage stress is preferably 110 ° C. or more, more preferably 130 ° C. or more, and still more preferably 150 ° C. or more. Is preferably at least 0.15 cN / dtex, more preferably at least 0.20 cN / dtex, even more preferably at least 0.25 cN / dtex.

Further, the polyester composite yarn of the present invention
1. Worcester unevenness U%, which is an index of thickness unevenness in the yarn longitudinal direction, is 2.
It is preferably 0% or less. Thereby, not only the occurrence of the spots of dyeing of the fabric can be avoided, but also the spots of shrinkage of the yarn when the fabric is formed can be suppressed, and a beautiful fabric surface can be obtained. Worcester spot U% is more preferably 1.5% or less, and further preferably 1% or less.

Further, the polyester composite yarn of the present invention
JIS L1090 (Synthetic fiber filament bulky processed yarn test method) It is preferable that the stretch and elongation shown in Section 5.7 Method C (simple method) be 30% or more and the stretch elasticity be 85% or more. Conventionally, as described in JP-A-6-322661, etc., a latently crimp-expressing polyester fiber was heat-treated under a state close to no load, and the expansion and contraction rate there was defined. It does not necessarily reflect the elasticity under the constraint of the fabric.

The inventors of the present invention focused on the importance of the ability to exhibit crimp under the constraint of the cloth, and heat-treated by the method shown in FIG. Elastic modulus was defined.

Stretch rate (%) = [(L1-L0) / L0] × 100% Stretch modulus (%) = [(L1-L2) / (L1-L0)] ×
100% L0: 90 ° C. hot water treatment is performed for 20 minutes while a 1.8 × 10 ⁻³ cN / dtex load is hung on the fiber cassette, and the cassette length after air-drying for one day and night L1: L0 measurement, L0 measurement load 90 × 10
^-3 cN / dtex load suspended 30 seconds later L2: After measuring L1, the L1 measured load was removed, left for 2 minutes, and again 1.8 × 10 ^-3 cN / dtex load was suspended.
Length after 0 second, that is, 1.8 × 10 ^−3, which corresponds to the binding force in the fabric.
By suspending the same load as the cN / dtex on the fiber case and performing heat treatment, the crimp development ability under the constraint of the fabric can be expressed by the stretch ratio of the fiber case. The higher the stretching / elongation ratio, the higher the crimp developing ability, and a value of 30% or more is preferable because appropriate stretch characteristics can be imparted. The higher the stretch ratio, the better the stretch performance when made into a fabric, so it is preferably at least 50%, more preferably at least 80%.

A PET-based composite yarn having an intrinsic viscosity difference as described in JP-B-44-2504, or a combination of homo-PET and highly shrinkable copolymer PET as described in JP-A-5-295634. In the composite yarn of the above, the expansion / contraction rate is at most about 5%.

When the stretchability is imparted by the expansion and contraction of the coil crimp, the durability of the crimp is also an important factor. The elastic modulus can be referred to as an index. The higher the elastic modulus of elasticity, the better the wearing durability and the fit, and it is preferably 85% or more, more preferably 90% or more.

Further, the polyester composite yarn of the present invention
By shifting the crimp phase between the constituent conjugate fibers and increasing the voids between the single fibers to form a bulky form, a woven fabric having high softness and resilience and having no sense of sheer can be obtained. Therefore, the bulk height of the composite yarn of the present invention is preferably 30 cc / g or more, and more preferably 40 cc / g or more. The bulk height can be measured by the apparatus shown in FIGS. Incidentally, a PET-based composite yarn having an intrinsic viscosity difference as described in JP-B-44-2504 or JP-A-5-2956.
No. 34, homo-PET and highly shrinkable copolymer P
The bulk height of the composite yarn in combination with ET is at most 10cc
/ G, which is described in JP-B-43-19108, JP-A-2000-239927, and JP-A-2000-256.
No. 918 discloses a composite yarn having a bulk height of 20 c
It is about c / g.

The polyester composite yarn of the present invention is preferably subjected to a confounding treatment and has a CF value in the range of 5 to 100. When the CF value is less than 5, the bundle convergence of the yarn is low, so that the yarn breaks and separates into single fibers at the time of knitting and weaving, which causes single yarn breakage. Conversely, if the CF value exceeds 100, the quality of the woven or knitted fabric will be reduced. Therefore, the CF value is more preferably from 10 to 80, and even more preferably from 20 to 60. Further, in order to prevent yarn cracking, it is preferable that the yarn surface is coated with a sizing agent.

The polyester-based composite yarn of the present invention
The Young's modulus is preferably 60 cN / dtex or less, and the minimum value of the differential Young's modulus at an elongation of 3 to 10% is preferably 15 cN / dtex or less. All of these properties are related to the softness, resilience, and elastic recovery of the fabric, and it is preferable that all of the properties have lower values in order to provide soft stretchability. Therefore, the Young's modulus is 40 cN / dt
ex is more preferably less than or equal to ex. Similarly, elongation 3 ~
The minimum value of the differential Young's modulus at 10% is 10 cN / dtex.
It is more preferred that:

The polyester composite yarn of the present invention has a higher stretchability than a woven fabric in a knitted fabric having a low fabric binding force. What prominently shows the characteristic is the elongation at break after the boiling water treatment. The higher the elongation at break after boiling water treatment, the better the stretchability. Therefore, the elongation at break after boiling water treatment is preferably 100% or more, and more preferably 150% or more.

The elongation at break after the treatment with boiling water was measured by treating the fiber as a sample with boiling water under a condition of almost no load to develop coil crimp, and then 1.8 × 10 ⁻³ cN / dtex. It is determined by performing a tensile test while fixing the grip length under load.

Further, experiments by the present inventors have revealed that the higher the crystallinity, the higher the crimp recovery ability and the higher the elastic modulus. Therefore, the higher the crystallinity, the better, preferably 35% or more, more preferably 40% or more.

Here, the degree of crystallinity was measured according to JIS L10
13 (Test method for chemical fiber filament yarn) 7.14.2
The density was measured in accordance with the density gradient tube method described above, and the crystallinity was determined by the following equation (however, the values of dc and da are those of PTT, and are the crystallinity when the composition of the composite fiber is all PTT). ).

Xc [%] = {dc × (d−da)} /
{D × (dc−da)} × 100 Xc: crystallinity (%) d: measured yarn density dc: density of perfect crystalline part da: density of perfect amorphous part where dc: 1.387 g / cm ³ , Da: 1.295
g / cm ³ was used.

The polyester composite yarn of the present invention has no
Even if the fabric is twisted or sweet twisted, there is little embossing and the fabric surface
It can be finished flat. Also, reduce the number of twists
The open state of the single fiber is good because it can be
Excellent damping properties. As a result, it is suitable for thin-walled applications where sheer protection is required.
Can also be deployed. In order to provide sheer resistance,
Since it is necessary to lower the convergence, the twist coefficient K is 0 to 100.
It is preferable to use 00 with no twist or medium twist. However, twist coefficient K = T × D^0.5  T: the number of twists per 1 m of yarn length, D: the fineness of the yarn (dtex) Here, the number of twists T per 1 m of yarn length is 9 with an electric twister.
0x10^-3Untwist under the load of cN / dtex and completely untwist
The value obtained by dividing the number of untwists when twisted by the yarn length after untwisting.
You.

Although the polyester-based composite yarn of the present invention can be used alone, it can impart moisture absorption / release properties and heat retention by combining with a cellulose fiber such as rayon or cupra, or by combining it with wool. It is preferable because the wearing comfort is improved.

The fabric form of the present invention can be appropriately selected depending on the purpose, such as a woven fabric, a knitted fabric, a nonwoven fabric, and a cushion material, and can be suitably used for shirts, blouses, pants, suits, blousons and the like.

Next, a preferred method for producing the polyester composite yarn of the present invention will be described.

The polyester composite yarn of the present invention is a side-by-side composite yarn composed of two types of polyester polymers. A polyester mainly composed of PTT is disposed in the polyester polymer A serving as a high shrinkage component, and the polyester polymer B serving as a low shrinkage component has a fiber forming property having a lower viscosity than the polyester polymer A. After disposing polyester B and using, for example, a die having a structure as shown in FIG. 6 and merging at the upper part of the discharge hole to form a side-by-side composite flow, a discharge hole for obtaining the cross-sectional shape of the present invention, for example, FIG. By discharging such that a composite interface is formed in the short axis direction of the slit shown in FIG. 7, the cross-sectional shape of the present invention can be obtained. However, the die specification is not limited to this as long as the cross-sectional shape of the present invention can be obtained. In addition, the discharged yarn may be cooled and solidified, then may be manufactured by a two-step method of once winding and then drawing, or may be manufactured by a direct spinning drawing method of drawing directly after spinning. Good.

Further, in order to stably produce the composition while achieving the object of the present invention, the intrinsic viscosity of the polymer used as each component and the difference in intrinsic viscosity between the components become important. Even if it is a conjugate fiber, it is not practical if the viscosity of one side component is too low and there is no fiber forming ability, or if it is too high and a special spinning device is required. Further, the degree of bending (bending phenomenon) of the yarn immediately below the discharge hole is determined by the difference in viscosity between the components. If the bending immediately below the discharge hole is large, arrhythmia (pitching) of the discharge flow is likely to occur, which may cause a deterioration in the spinning property. Therefore, in order to achieve good spinning properties while achieving the object of the present invention, the intrinsic viscosity (IV) of each component is preferably a combination satisfying the following formula.

0.30X ≦ Y ≦ 0.45X + 0.30 0.45 ≦ Y 0.8 ≦ X ≦ 2.0 (where Y: intrinsic viscosity of polyester-based polymer B (I
V) X: Intrinsic viscosity (IV) of polyester-based polymer A) When performing the composite spinning, the intrinsic viscosity (IV) of the fiber-forming polyester-based polymer B is set to 0.45 or more, whereby stable yarn production is performed. This is preferred because of its good properties. More preferably 0.5
0 or more. In order to obtain even higher crimp characteristics,
It is preferably 0.7 or less. On the other hand, in order to stably melt extrude the polyester polymer A mainly composed of polytrimethylene terephthalate, the intrinsic viscosity is 0.8 to
2.0 is preferable, and more preferably 1.1 to 1.
7

As a combination of the intrinsic viscosities of the two components, the value of Y is made larger than Y = 0.30X,
This is preferable because excessive spinning of the spun yarn toward the high-viscosity component side can be suppressed, and the yarn can be stably produced for a long time. On the other hand, if Y = 0.45X + 0.30, Y
Is preferable, since the crimping characteristics of the obtained yarn can be set to a target level.

The spinning temperature was set at the polyester polymer B.
In the case of PTT or PBT, the temperature is preferably 245 to 270 ° C., and in the case of PET, it is preferably 265 to 290 ° C. If necessary, a heating cylinder of 2 to 20 cm below the base, a suction device for monomers, oligomers, etc., polymer oxidation An inert gas generator such as air, steam, or N2 for preventing deterioration or contamination of the base hole may be provided.

In order to reduce the thickness unevenness (Worcester unevenness) of the yarn and obtain a high-quality fabric, the spinning speed is set to 1000.
m / min or more, preferably 1200 m / min.
Min, more preferably 1400 m / min or more.

Next, a drawing method for obtaining the polyester composite yarn of the present invention will be described with reference to the drawings. FIG. 8 shows an example of a method in which an undrawn yarn once wound is drawn by using a drawing machine, and FIG. 9 shows an example of a direct spinning drawing method in which, after spinning, drawing is performed once without winding. .
In order to impart the high elasticity characteristic which is the object of the present invention,
It is necessary to increase the difference in shrinkage between the high shrinkage component composed of the polyester polymer A and the low shrinkage component composed of the polyester polymer B, and stretching at a high magnification is effective as a method. Therefore, the stretching ratio is preferably 65% or more of the maximum stretching ratio.
% Is more preferable. here,
The maximum draw ratio is a value obtained by drawing the undrawn yarn obtained by the composite spinning at room temperature with a tensile tester and elongation (%) at the point where the strength is maximum by the following formula. The measurement was performed five times, and the average elongation was E.

Maximum stretching ratio (times) = (E / 100) +1 Here, an example of a stretching method will be described below. In the two-step method shown in FIG.
Step stretching or additional hot roll
Stretch more than steps, and if necessary, hot rolls 11-
The confounding process is performed while relaxing between the cold rolls 13. Further, the winding tension (the tension between the cold roll 13 and the winding machine 14 in FIG. 8) is used to alleviate the residual strain inside the fiber and to maintain the crimp phase between the single yarns. It is necessary to wind up with low tension. The winding tension is preferably at most 0.05 cN / dtex, more preferably at most 0.03 cN / dtex, even more preferably at most 0.02 cN / dtex. The winding tension was determined by measuring the yarn tension using a tension analyzer, model TTA-801, manufactured by Toray Engineering Co., Ltd., and dividing by the fineness (dtex) of the wound yarn.

In the direct spinning drawing method shown in FIG. 9, drawing may be performed between the hot roll 17 and the hot roll 18, and the relaxation treatment may be performed between the hot roll 18 and the godet roll 19, or between the hot roll 17 and the godet roll. 1
After the two-stage stretching between the godet rolls 9 and 9, the entanglement treatment may be performed while relaxing between the godet rolls 19 to 21 as necessary. The winding tension is preferably as low as possible while suppressing the occurrence of reverse winding on the roll.
It is preferable to wind at 15 cN / dtex.

In any case, the maximum stretching ratio indicates the stretching ratio before the relaxation treatment step. In the case of the two-stage stretching, the ratio obtained by multiplying the first and second stretching ratios is 65, which is the maximum stretching ratio. % Or more.

As a means for further increasing the contraction stress, the following method is effective. When the undrawn yarn package once wound by the composite spinning is aged at an ambient temperature of 20 ° C. or more for 8 hours or more, a pseudo-crystalline constraint point is formed inside the PTT fiber. Therefore, when stretching, PPT
Higher stress is applied to the side, and the shrinkage stress can be increased accordingly. However, if the aging time exceeds 2 weeks, the drawability is reduced due to embrittlement of the undrawn yarn.
Aging preferably ranges from 8 hours to 2 weeks.

When a rubbing member is set in a drawing region, for example, between the hot rolls 10 and 11 in FIG. 8 or between the hot rolls 17 and 18 in FIG. 9, the drawing tension of the yarn is reduced by frictional resistance. This is preferable because the shrinkage stress can be increased by increasing the internal strain. As the rubbing body used, the surface of the rubbing body has a matte finish pin,
Hot plates, rotating rolls and the like are preferred. Further, in order to make the temperature at which the maximum of the shrinkage stress reaches 110 ° C. or more, the yarn temperature must be 110 ° C.
The temperature of the heat treatment apparatus (for example, the hot roll 11 in FIG. 8 or the hot roll 18 in FIG. 9) may be set to be higher than or equal to ° C. When the heat treatment apparatus is a contact type as shown in FIGS. 8 and 9, the heat treatment temperature is preferably in the range of 110 to 200 ° C.
The range of 150 to 180 ° C is more preferable. Since the melting point of PTT is around 230 ° C., substantial heat treatment is not possible under conditions where the yarn temperature exceeds 210 ° C. The stretching temperature (for example, the temperature of the hot roll 10 in FIG. 8 and the temperature of the hot roll 17 in FIG. 9) is such that PTT or PB
40 to 80 ° C for T, 55 to 95 ° C for PET
It is preferable that

In order to provide a high-quality appearance, which is the object of the present invention, it is necessary to shift the phase of the coil crimp for each single fiber. As means for that purpose, it is preferable to carry out a bulk-up treatment using a high elastic recovery stress of the PTT fiber in addition to the flat cross-section yarn having the specific shape. Here, an example of a bulk-up method will be described.
The composite yarn of the present invention can exhibit crimp even under relatively high tension due to elastic recovery stress immediately after stretching. For this reason, as described above, after stretching between the hot rolls, a 3-15% relaxation treatment is performed to reduce the yarn tension, so that crimping occurs and the yarn is opened, and the crimping phase shifts and the bulkiness increases. It can be in the form. As described above, it is important for the bulkiness to be improved by the relaxation treatment that the crimp is stably developed. For that purpose, the surface of the supply roll used for the relaxation treatment (for example, between the hot roll 11 and the cold roll 13 shown in FIG. In this case, the surface of the hot roll 11 is preferably used for the relaxation treatment, and the surface of the godet roll 19 is used for the relaxation treatment between the godet roll 19 and the godet roll 21 in FIG. By using a mirror surface roll having a high friction coefficient, slippage of the running yarn can be suppressed, so that a high elastic recovery stress can be maintained up to the yarn separation point.

Further, since the bulk height is proportional to the degree of opening of the yarn in the relaxation treatment zone, it is preferable to reduce the yarn tension in the relaxation treatment zone. Therefore, the yarn tension in the relaxation treatment zone is 0.05 cN /
It is preferable to set the relaxation rate so as to be not more than dtex, and it is more preferable to set the relaxation rate so as to be not more than 0.03 cN / dtex. Here, the yarn tension is a value obtained by dividing the tension (cN) applied to the yarn by the fineness (dtex) of the drawn yarn.

Further, as another method for imparting bulkiness, a drawn yarn is passed through a stacking tube and is once made to be in a non-tension state so as to exhibit crimping. A method of shifting the crimp phase by blending composite fibers having different diameters may be used. Further, the above methods may be combined.

[0069]

The present invention will be described below in detail with reference to examples.
In addition, the measuring method in the Example used the following method.

A. Intrinsic viscosity orthochlorophenol (hereinafter abbreviated as OCP) 10
0.8 g of the sample polymer was dissolved in ml, and the relative viscosity ηr was determined at 25 ° C. using an Ostwald viscometer by the following equation to calculate IV.

Ηr = η / η ₀ = (t × d) / (t ₀ × d ₀ ) IV = 0.0242ηr + 0.2634 where η: viscosity of polymer solution, η ₀ : viscosity of OCP, t: solution D: solution density (g / cm ³ ), t ₀ : OCP fall time (seconds), d ₀ : OCP density (g / cm ³ ).

B. Shrinkage stress Thermal stress meter manufactured by Kanebo Engineering Co., Ltd.
The measurement was performed at a heating rate of 150 ° C./min. Sample is 10cm
× 2 loop, and the initial tension was fineness (dtex) × 0.
9 × (1/10) gf.

C. Worcester spots The thickness unevenness (normal test) in the longitudinal direction of the yarn was measured using a USTER TESTER MO manufactured by Zellbeger Worcester Co., Ltd.
Measured with NITOR C. The condition is that the yarn speed is 50 m / min for 1 minute and the average deviation rate (U%) in the normal mode.
Was measured.

D. Stretching elongation rate, stretching elasticity According to JIS L1090 (Synthetic fiber filament bulky processed yarn testing method), method 5.7 (simple method), heat treatment is performed by the method shown in FIG. The stretch ratio and stretch modulus were defined.

Stretching elongation (%) = [(L1-L0) / L0] × 100% Stretching elasticity (%) = [(L1-L2) / (L1-L0)] ×
100% L0: 90 ° C. hot water treatment for 20 minutes with a 1.8 × 10 ⁻³ cN / dtex load suspended on the fiber cassette, and the length of the cassette after air-drying all day long L1: L0 measurement, L0 measurement load 90 × 10
^-3 cN / dtex load suspended 30 seconds later L2: After measuring L1, the L1 measured load was removed, left for 2 minutes, and again 1.8 × 10 ^-3 cN / dtex load was suspended.
Case length after 0 second E. Bulk Height FIG. 4 is a perspective view of an apparatus for measuring the bulk height M, and FIG. 5 is a sketch for explaining a measuring method using this apparatus. Two cuts 6 are provided on the upper surface of the sample table 1, the distance between the outer edges is 6 mm, and the cut has a width of 2.5 mm.
cm of PET film 2, and a metal fitting 3 with a pointer and a load 4 are coupled under the PET film 2. The pointer of the metal fitting 3 is set so as to indicate the zero position of the scale 5 when the sample is not mounted. The sample is displayed with a fineness of 50,0 using a measuring machine with a circumference of 1 m.
00dtex, yarn length 50 cm (for example, 50 dtex yarn 50,000 ÷ 50 ÷ 2 = 50
Since it is 0, a 500 m yarn is wound 500 times with a measuring machine to make a scab with a display fineness of 50,000 dtex. Next, the obtained scab 7 is inserted between the PET film 2 and the sample table 1 as shown in the front view (a) and the cross-sectional view (b) of FIG. 5, and the shrunk sample is pulled to make the scab length 25 cm. The case 7 as described above. The load 4 is set to be 50 g in total with the metal fitting 3 with the pointer, and the L (cm) indicated by the pointer is read. The measurement is performed three times, and the bulk height M is calculated from the average L value by the following equation.

M (cc / g) = volume in film V / weight of yarn in film W V (cc) = L ² /π×2.5 W (g) = 50000 × (0.5 / 0.25 ) X (0.025 / 10,000) = 0.25 F.R. CF value The CF value was measured under the conditions shown in JIS L1013 (Test method for chemical fiber filament yarn) 7.13. The number of tests was set to 50 times, and a CF value (Coherence Factor) was calculated from the average value L (mm) of the confound length by the following formula.

CF value = 1000 / L Strong elongation, Young's modulus (initial tensile resistance) The original yarn is TENSILON manufactured by Orientec Co., Ltd.
It was measured under constant-speed elongation conditions shown in JIS L1013 (chemical fiber filament yarn test method) by UCT-100. The elongation at break was determined from the elongation at the point showing the maximum strength in the SS curve. The Young's modulus is JIS L
7.1 of 1013 (Test method for chemical fiber filament yarn)
The initial tensile resistance was measured under the conditions shown in FIG.

H. Differential Young's Modulus The stress at each point of the SS curve obtained in the E term was obtained by differentiating the elongation as shown in FIG.

I. Elongation at break after boiling water treatment Orientec Co., Ltd., in which the original yarn was subjected to hot water treatment at 90 ° C. for 20 minutes under almost no load to develop coil crimp.
1.8 × 1 using TENSILON UCT-100
A constant speed elongation test was performed with the grip length fixed under a load of 0 ^-3 cN / dtex. The grip interval is 50mm and the pulling speed is 20
It was pulled at 0 mm / min and determined from the elongation at the point showing the maximum strength.

J. Crystallinity Measure the density according to the density gradient tube method of JIS L1013 (Test method for chemical fiber filament yarn) 7.14.2,
The crystallinity was determined by the following equation.

Xc [%] = {dc × (d−da)} /
{D × (dc−da)} × 100 Xc: crystallinity (%) d: measured yarn density dc: density of perfect crystalline part da: density of perfect amorphous part where dc: 1.387 g / cm ³ , Da: 1.295
g / cm ³ was used.

K. Melt viscosity Using Toyo Seiki Co., Ltd. Capillograph 1B, in a nitrogen atmosphere, temperature 280 ° C., strain rate 1216 sec.
The measurement at c ^-1 was performed three times, and the average value was taken as the melt viscosity.

L. Maximum draw ratio Undrawn yarn is TENSILO manufactured by Orientec Co., Ltd.
It was extended with NUCT-100, and was obtained from the elongation E of the point showing the maximum strength in the obtained SS curve. In addition,
The elongation conditions are as follows: gripping interval 50 mm, pulling speed 400 mm
/ Min, and the measurement was performed 5 times, and the average was E.

Maximum stretching ratio (times) = (E / 100) +1 Example 1 Intrinsic viscosity (IV) containing 0.35% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent is 1.50.
A homo-PTT having a (melt viscosity of 1340 poise) is a polyester polymer A, and a homopolymer having an intrinsic viscosity (IV) of 0.52 (melt viscosity of 570 poise) containing 0.35% by weight of titanium oxide having an average particle size of 0.4 μm is used. PET is melted separately as polyester polymer B,
At a spinning temperature of 275 ° C., the mixture is discharged from the spinneret having the structure shown in FIG. 6 and the composite spinneret having the 36 discharge holes shown in FIG.
An undrawn yarn with a side-by-side composite structure of 36 filaments was drawn at 400 m / min and 245 dtex and 36 filaments. The cross-sectional shape is an asymmetric flat shape in which the outer peripheral shape of the PTT shown in FIG. 1A is substantially elliptical and the outer peripheral shape of the PET is substantially circular. ) Is 1.
It was 8. The maximum draw ratio of the undrawn yarn is 4.8.
It was twice. Further, after the undrawn yarn was aged at an environmental temperature of 25 ° C. × 2 days, the first hot roll was heated to a temperature of 70 ° C. and mirror-finished (surface roughness of 0.8) using a drawing machine shown in FIG.
S) The temperature of the second hot roll 11 is 160 ° C., and the stretching ratio between the first hot roll 10 and the second hot roll 11 is 3.1.
Stretched at 5 times, and further stretched 1.02 times between the second hot roll 11 and the cold roll 13 (the maximum stretch ratio of 67).
%) And wound up while controlling the tension so that the tension (winding tension) between the cold roll 13 and the winder 14 becomes about 0.02 cN / dtex, to obtain a drawn filament of about 83 dtex and 36 filaments. In addition, the relaxation rate between the cold roll 13 and the winder 14 was about 8%. Both spinning and drawing exhibited good spinnability, and no yarn breakage occurred. The physical properties are shown in Table 1, which showed excellent bulkiness and stretchability. In addition, the obtained yarn is untwisted into a weft, 56 dtex,
The 18-filament PET ordinary drawn yarn is untwisted into a warp to create a 2/1 twill (86 warp / inch) greige fabric, relaxed scouring at 80-95 ° C by SOFCER, and intermediate setting at 170 ° C. 12% by weight with a hot aqueous solution of NaOH and dyed at 110 ° C.
Finish setting was performed at 60 ° C. to obtain a stretch fabric. The surface of the fabric was flat without the occurrence of wrinkles and wrinkles in the form of Yangyanagi, and showed excellent stretchability with a soft texture.

Examples 2 and 3 Intrinsic viscosity (IV) containing 0.35% by weight of titanium oxide having an average particle size of 0.4 μm as a matting agent was 0.48.
Homo PET having a melt viscosity of 450 poise or an intrinsic viscosity (IV) of 0.65 (melt viscosity of 1190 poise)
Was evaluated in the same manner as in Example 1 except that the homo PET was used for the polyester polymer B. Table 1 shows the results.
In Example 2 using homo-PET having an intrinsic viscosity (IV) of 0.48, a slight embossment appeared on the surface of the woven fabric, but was superior to the conventional PET / PET side-by-side composite yarn. In addition, the expansion and contraction characteristics were superior to those of Example 1. In addition, a homo PET having an intrinsic viscosity (IV) of 0.65
In Example 3 using, the bending immediately below the die was small, and the spinning property was good. In addition, it exhibited excellent bulkiness, had no grain on the woven fabric, and had good quality.

Example 4 A homopolymer PTT containing 0.1% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent and having an intrinsic viscosity (IV) of 1.02 (melt viscosity of 900 poise) was used as a polyester polymer A. The evaluation was performed in the same manner as in Example 1 except that the above was used. Table 1 shows the results. 1.02 intrinsic viscosity (IV)
In Example 4 using the homo-PTT, the spinning property and the drawing property were good and the yarn breakage did not occur. In addition, although the stretchability was slightly inferior to that of Example 1, it had the potential to be sufficiently used as a stretch material.

Example 5 A homo-PTT having an intrinsic viscosity (IV) of 1.72 (melt viscosity of 1,420 poise) containing 0.1% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent was obtained from a polyester polymer A. And the stretching ratio between the first hot roll 10 and the second hot roll 11 is 3.0 times (the maximum stretching ratio of 6).
8%), and evaluated in the same manner as in Example 1.
Table 1 shows the results. In Example 5, the spinnability was good in both spinning and drawing, and no yarn breakage occurred. Example 1
As in the case of, excellent bulkiness and elasticity were exhibited.

Comparative Example 1 Evaluation was made in the same manner as in Example 3 except that the outlet of the die was circular. The cross-sectional shape of Comparative Example 1 is almost circular (flatness 1)
Met. In addition, the willow-like grain was partially generated on the fabric surface, and wrinkles were concentrated on the ears of the fabric, resulting in poor quality.

Comparative Example 2 Evaluation was made in the same manner as in Example 1 except that the temperature of the second hot roll 11 in the stretching step was 35 ° C. Since the peak temperature indicating the maximum value of the shrinkage stress of the raw yarn of Comparative Example 2 was as low as 97 ° C., the fabric was suddenly shrunk in the relaxing step, wrinkled, and the surface quality was poor. In addition, the obtained fabric had a rough feeling and a low elasticity, and lacked the potential as a stretch material.

Comparative Example 3 The stretching ratio between the first hot roll 10 and the second hot roll 11 in the stretching step was 2.85 times (61% of the maximum stretching ratio).
%) Was evaluated in the same manner as in Example 1. Table 1 shows the results. The raw yarn of Comparative Example 3 had a low expansion / contraction ratio due to shrinkage stress, had a low ability to exhibit crimp under the constraint of a woven fabric, and was inferior in elasticity, and thus lacked the potential as a stretch material.

Comparative Example 4 A homo-PET (melt viscosity 250 poise) having an intrinsic viscosity (IV) of 0.4 and containing 0.35% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent was polyester polymer B. Table 1 shows the results of the evaluation performed in the same manner as in Example 1 except that the evaluation was made. With the polymer combination of Comparative Example 4, the bending immediately below the die was severe and spinning could not be performed stably.

EXAMPLE 6 A homopolymer PTT (melt viscosity 260 poise) containing 0.65% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent and having an intrinsic viscosity (IV) of 0.65 was a polyester polymer. B, the spinning temperature was 265 ° C., the temperature of the first hot roll 10 was 60 ° C., and the stretching ratio was 3.0 times (70% of the maximum stretching ratio), and evaluated in the same manner as in Example 1. . Table 1 shows the results. The spinning property of Example 6 was good. In addition, it has soft elasticity due to the low Young's modulus and differential Young's modulus of the original yarn.
In addition to being superior in soft stretchability, the elastic modulus showing the crimp fastness was high.

Example 7 A homopolymer PBT (melt viscosity 440 poise) containing 0.1% by weight of titanium oxide having an average particle diameter of 0.4 μm as a matting agent and having an intrinsic viscosity (IV) of 0.75 was a polyester polymer. The evaluation was performed in the same manner as in Example 6 except that B was used. Table 1 shows the results. The spinning property of Example 7 was good. Further, the bulkiness was good as in Example 1, and the soft stretch property and the resilience after stretching (stretch back property) were superior to Example 1.

[0094]

[Table 1] Example 8 Table 2 shows the results of the evaluation performed in the same manner as in Example 1 except that the shape of the discharge hole was changed as shown in FIG. As shown in FIG. 1D, the cross-sectional shape of the eighth embodiment is such that the outer peripheral shape of the PET is substantially circular,
The outer shape of the PTT was an asymmetric flat shape having a substantially square shape, and the flatness was 1.6. Example 8 had slightly lower bulkiness and lower softness than Example 1, but had good surface quality.

Example 9 Example 9 was carried out in the same manner as in Example 1 except that the winding tension was controlled to be 0.07 cN / dtex. Table 2 shows the results
Shown in In Example 9, although the stretch properties were good, the bulkiness was low, and small grains were generated on the surface of the fabric, and the quality was slightly inferior.

Example 10 In the stretching step, a polyjet nozzle 12 made by Heberline was placed between the second hot roll 11 and the cold roll 13.
Installed, relaxation rate 1%, confounding pressure pneumatic 0.3MPa
The yarn obtained by the entanglement treatment is tricotted, and the yarn is subjected to relaxing scouring and dyeing at 80 to 95 ° C. by a conventional method to obtain a tricot.
The procedure was carried out in the same manner as in Example 1 except that the finishing was set at 0 ° C. Table 2 shows the results. The yarn of Example 10 is CF
The value was 60. Further, in the knitting process, a process defect called “adhesion” generated in the non-entangled yarn (CF value zero) of Example 1 did not occur, and the knitting property was excellent. The bulkiness, softness and stretchability were all good.

Example 11 Second hot roll 11 and cold roll 1 in the stretching step
The procedure was performed in the same manner as in Example 10 except that the relaxation rate between the three was 2%. Table 2 shows the results. The raw yarn of Example 11 had a CF value of 105. In Example 11, although the knitting property was excellent, "irritation" occurred on the surface of the fabric, so that the quality was slightly inferior.

Example 12 At a spinning speed of 920 m / min, a 285 dtex, 36 filament, side-by-side type composite structure undrawn yarn was obtained. The drawing ratio between the first hot roll 10 and the second hot roll 11 in the drawing step was 3.7. Times (maximum stretch ratio of 69)
%) Was evaluated in the same manner as in Example 1. Table 2 shows the physical property values. Example 12 showed excellent bulkiness, softness and stretch properties, as in Example 1.
Since U%, which is an index of yarn spots, was as high as 2.5%, "irritation" occurred on the fabric surface, and the quality was slightly inferior.

Comparative Example 5 A matting agent containing 0.35% by weight of titanium oxide having an average particle diameter of 0.4 μm and an intrinsic viscosity (IV) of 0.85
Homo PET having a (melt viscosity of 3000 poise) was used as a polyester polymer A and spun at a spinning temperature of 290 ° C.
Evaluation was performed in the same manner as in Example 1 except that the hot roll 10 was stretched at a temperature of 80 ° C. Table 2 shows the results. Comparative Example 5 had good spinnability and stretchability, but was low in both bulkiness and stretchability. When it was made into a woven fabric, it produced Yangyan-like grains and lacked the potential as a stretch material. .

[0100]

[Table 2] Example 13 and Example 14 The polyester-based composite yarn obtained in Example 1 was 300
t / m (twist coefficient K: 2750, Example 13), 1000
An S / Z twist of t / m (twist coefficient K: 9165, Example 14) was applied to form a weft, and a plain weave was produced using 110 dtex, 48 filament ordinary PET drawn yarn (boiling yield 6%) as the warp yarn. . 80-95 ° C by SOFCER
Relax scouring, 3% after intermediate setting at 170 ℃
Reduce the weight by 15% by weight with a hot aqueous solution of NaOH,
, And finished at 160 ° C. All the obtained fabrics were soft and excellent in stretchability. In addition, those having a twist number of 1000 t / m had fine uneven surfaces and exhibited a texture suitable for a spring-summer material having a refreshing feeling.

[0101]

EFFECT OF THE INVENTION By using the polyester-based composite yarn of the present invention, excellent stretchability is imparted by soft touch, and since it is non-torque, it is difficult for the twist or wrinkle of the Yangyan style to appear even in non-twisted to sweet-twisted, It is possible to obtain a high-quality cloth without dye contamination which is a problem in mixing polyurethane.

[Brief description of the drawings]

FIG. 1 is a diagram showing a fiber cross-sectional shape of a single fiber constituting a composite yarn of the present invention.

FIG. 2 is a view showing an arrangement of a composite yarn of the present invention in a cross-sectional direction.

FIG. 3 is a diagram for explaining a method of measuring a stretch rate and a stretch modulus.

FIG. 4 is a perspective view of an apparatus for measuring bulk height.

FIG. 5 is a sketch showing a method of measuring bulk height.

FIG. 6 is a longitudinal sectional view of a die preferably used for producing the fiber of the present invention.

FIG. 7 is a view showing the shape of a discharge hole preferably used for producing the fiber of the present invention.

FIG. 8 is a schematic diagram of a stretching device used in an embodiment of the present invention.

FIG. 9 is a schematic view of a direct spinning and stretching apparatus used in an example of the present invention.

FIG. 10 is a stress and differential Young's modulus-elongation curve of the fiber of the present invention (Example 1).

[Description of Signs] 1: Sample table 2: PET film 3: Metal fitting with pointer 4: Load 5: Scale 6: Cut 7: Ledge 8: Unstretched yarn package 9: Feed roll 10, 11: Hot roll 12: Entangled nozzle 13: Cold roll 14: Winding machine (drawn yarn package) 15: Spun yarn 16: Entangled nozzle 17, 18: Hot roll 19, 21: Godet roll 20: Entangled nozzle 22: Winding machine (drawn yarn package)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D03D 15/04 102 D03D 15/04 102A D04B 1/16 D04B 1/16 1/20 1/20 21/00 21/00 BF term (reference) 4L002 AA07 AB02 AB04 AB05 AC01 AC06 CA01 DA01 DA04 DA05 EA06 FA01 4L036 MA05 MA17 MA20 MA33 PA01 PA03 PA17 PA42 RA04 UA01 4L041 AA07 BA02 BA05 BA09 BA34 BA36 CA06 CA08 CB05 A22A21 A08 AA37 AA46 AA48 AA49 AA55 AA56 AB08 AB12 AB13 AB21 AC07 AC09 AC10 AC12 BA01 BA02 CA00 CA04 CA12 CA15 DA01 EB04 EB05

Claims (15)

[Claims] 1. A conjugate fiber in which two kinds of polyester polymers A and B are bonded side by side along the fiber length direction, wherein the polyester polymer A is a polyester mainly composed of polytrimethylene terephthalate. The polyester polymer B is a fiber-forming polyester, the cross-sectional shape of the composite fiber is a flat shape having a composite interface in the minor axis direction, the outer shape of the polyester polymer B is substantially circular, A multifilament composed of a conjugate fiber in which the outer shape of the polyester-based polymer A is substantially elliptical or substantially square and the flatness represented by the ratio of the major axis / minor axis of the cross section is 1.3 to 6. Polyester composite yarn characterized by the following. 2. The polyester composite yarn according to claim 1, wherein the temperature at which the maximum of the shrinkage stress is 110 ° C. or more, and the maximum value of the shrinkage stress is 0.15 cN / dtex or more. 3. The polyester composite yarn according to claim 1, wherein the Worcester spot U% is 2.0% or less. 4. The polyester composite yarn according to claim 1, wherein the stretch ratio after heat treatment is 30% or more, and the stretch modulus is 85% or more. 5. The polyester composite yarn according to claim 1, wherein the bulkiness is 30 cc / g or more. 6. The polyester composite yarn according to claim 1, wherein a CF value due to entanglement is 5 to 100. 7. Particles having an average particle size of 0.01 to 2 .mu.m are added to a particle of 0.1.
The polyester-based composite yarn according to any one of claims 1 to 6, wherein the polyester-based composite yarn is contained in an amount of 1% by weight or more. 8. The polyester composite yarn according to claim 1, wherein the minimum value of the differential Young's modulus at an elongation of 3 to 10% is 15 cN / dtex or less. 9. The polyester composite yarn according to claim 1, wherein the elongation at break after treatment with boiling water is 100% or more. 10. The polyester composite yarn according to claim 1, wherein the polyester polymer B is a polyester mainly composed of polytrimethylene terephthalate. 11. The polyester composite yarn according to claim 1, wherein the polyester polymer B is a polyester mainly composed of polybutylene terephthalate. 12. A polyester mainly composed of polytrimethylene terephthalate is arranged in a polyester polymer A,
When the fiber-forming polyester is disposed on the polyester-based polymer B and the composite spinning is performed, a composite stream is formed by a combination in which each intrinsic viscosity (IV) satisfies the following formulas (1) to (3). It is discharged from the slit so that the minor axis direction of the slit is a composite interface, passes through a cooling zone, is taken up at a spinning speed of 1000 m / min or more, and is subsequently stretched at a draw ratio of 65% or more of the maximum draw ratio.
A method for producing a polyester-based composite yarn, which comprises winding after heat treatment as described above. 0.30X ≦ Y ≦ 0.45X + 0.30 (1) 0.45 ≦ Y (2) 0.8 ≦ X ≦ 2.0 (3) (where, Y: polyester type) Intrinsic viscosity of polymer B (I
V) X: intrinsic viscosity (IV) of polyester polymer A) 13. A stretch rate of 3 to 3 after stretching.
2. A relaxing process at 15%.
3. The method for producing a polyester composite yarn according to item 2. 14. The winding tension in the stretching step is 0.05 cN /
The method for producing a polyester-based composite yarn according to claim 12 or 13, wherein the dtex is not more than dtex. 15. The polyester-based composite yarn according to any one of claims 1 to 10, wherein the polyester composite yarn has a twist coefficient K of 0 to 10000 and is twisted or non-twisted. Fabric. (However, twist coefficient K = T × D ^0.5 T: number of twists per 1 m of yarn length, D: yarn fineness (dtex))