JP2001214335A - Low-shrinkage polyester slub yarn and combined polyester filament yarn composed thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-shrinkage polyester yarn for the production of a cloth having excellent processability in advanced processing, bulkiness, softness and resilience as well as excellent beautifulness of the cloth surface and wearing comfortability such as light weight and heat-retaining property. SOLUTION: The objective low-shrinkage polyester slub yarn is a conjugated sheath-core fiber containing a polymer (A) composed essentially of a polyester at the sheath part and a polymer (B) having a temperature dependency of the tensile viscosity higher than that of the polymer (A) at the core part, having thick parts and thin parts continuously arranged in longitudinal direction, having partial hollow part formed by the breakage of the polymer (B) of the core part and satisfying the following requirements. Boiling water shrinkage is 4-10%, dry-heat shrinkage after the boiling water shrinking is <=0%, the sum of the boiling water shrinkage and the dry-heat shrinkage after the boiling water shrinking is <=8%, the elongation is 60-100% and the U% is >=2.5%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fabric which is excellent in texture such as swelling, softness, resilience, and dryness, is excellent in aesthetics of a fabric surface, and is excellent in wearing comfort such as lightness and heat retention. The present invention relates to a low-shrinkage polyester yarn that can be provided.

[0002]

2. Description of the Related Art Polyester has various excellent properties including mechanical properties, and is therefore used in various fields including clothing. In clothing applications, quality has been improved targeting natural fibers, but especially as a means to realize a swelling and soft texture.
A so-called shrinkage difference mixed yarn which mixes fibers having different shrinkage characteristics due to heat is widely used. Especially as low shrinkage yarn,
Japanese Patent Application Laid-Open Nos. 9-27043 and 7-20754
No. 0, etc., the boiling water shrinkage (B
WS) is 10% or less, and the yarn that has been further shrunk in boiling water exhibits irreversible elongation when subjected to dry heat treatment at 160 ° C. or higher.
If a material having a negative B) is used, a sufficient difference in yarn length can be obtained after the dyeing process even if the density of the woven fabric increases, and a fabric having excellent swelling and softness can be obtained.

[0003] However, the yarn described in Japanese Patent Application Laid-Open No. 9-230443 can surely swell to some extent and obtain a fabric excellent in soft feeling. Since the yarn is a yarn, the elongation of the yarn is large (estimated to be 120% or more), the difference in elongation from the high shrink yarn to be mixed is too large, and the low shrink yarn is looped or sagged on the surface of the mixed yarn. And there is a problem in that the yarn is frequently broken in the weaving and knitting process, and the handleability in high-order processes is poor. For this reason, if the tension at the time of heat treatment is increased and the elongation is reduced, the yarn is excessively oriented, and not only is it not possible to obtain sufficient shrinkage properties, but also the rigidity of the yarn is excessively increased, and both the swelling feeling and the soft feeling are satisfactory. I couldn't get anything. In addition, by applying a high degree of entanglement, it is not impossible to improve the convergence of the yarn and suppress loops and sagging, but since the mixed fiber yarn is excessively tightly assembled and loses flexibility, There has been a problem in that the swelling feeling and the soft feeling are impaired when made into a fabric. In addition, since fibrous grooves are formed on the fiber surface, the fibers are liable to fibrillate, and when made into a fabric, there is a problem that whitening occurs due to slight friction and pilling characteristics are poor.

The yarn described in JP-A-7-207540 is also a heat-treated POY yarn, and has the same disadvantages as the yarn described in JP-A-9-273443.

On the other hand, conventionally, as a method of expressing a surface change with a natural spot on a fabric surface, a thick and thin yarn having a thick portion and a detail alternately in the yarn longitudinal direction has been used. this is,
Improvements have been made successively.
Japanese Patent Application Laid-Open No. 9-27043 describes that a low shrinkage yarn having a DSAB <0% as described in JP-A-9-273443 can be obtained and a fabric having an excellent texture can be formed. However, the thick and thin cycle is several tens cm to several meters, and there is room for improvement such as further shortening the thick and thin cycle in order to obtain an extremely delicate touch like a natural fiber.

[0006] In recent years, demands for polyester fabrics have been further advanced, and in addition to the above-mentioned feeling, wearing comfort such as lightness and heat retention is also required as basic performance. However, in the above-mentioned conventional technology, these wearing comforts were not at a satisfactory level.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks and is excellent in swelling, softness and resilience, and also excellent in aesthetics of the fabric surface, and is also excellent in wearing comfort such as lightness and heat retention. An object of the present invention is to provide a low-shrinkage polyester yarn for forming an excellent fabric.

[0008]

The object of the present invention is to provide a polymer (A), which is substantially a polyester, in a sheath portion, wherein the temperature dependence of the elongational viscosity is larger than that of the polymer (A). Is a core-sheath composite yarn having a thick portion and details continuous in the yarn longitudinal direction, and a hollow portion is partially formed by cutting the polymer (B) disposed in the core portion. This is achieved by a low-shrink polyester thick yarn having the following characteristics, characterized by having:

Boiling water shrinkage = 4-10% Dry heat shrinkage after boiling water shrinkage ≦ 0% Boiling water shrinkage + dry heat shrinkage after boiling water shrinkage ≦ 8% Elongation = 60-100% U% ≧ 2 .5%

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester used as the polymer (A) disposed on the sheath portion refers to a polymer having an ester bond.
T) is the most general and preferred. Further, a part of the diol component and a part of the acid component may be substituted with another copolymerizable component in a range of 15 mol% or less.
They may also contain additives such as other polymers, matting agents, flame retardants, antistatic agents, pigments and the like. further,
When the polyester contains a compound having the ability to form internal particles, the formed internal particles irregularly reflect light inside the fiber, and a beautiful silky luster is preferably obtained. Examples of the compound having the ability to form internal particles include a weak acid salt of an alkali metal or alkaline earth metal such as sodium acetate and calcium acetate, and calcium acetate is most preferred. The term “internal particles” as used in the present invention refers to fine particles that have been added to a compound having the ability to form internal particles and a polyester or an oligomer or an impurity contained therein to form a complex and precipitated in the polyester. . And the size of the formed internal particles, when observed with a microscope in a molten state of the polyester, as an average diameter of 0.01 ~
It is preferably about 5 μm.

As the polymer (B) disposed on the core, it is important to use a polymer whose temperature dependence of elongational viscosity is larger than that of the polymer (A). This is disclosed in
In the case where PET is used as the polymer (A), examples of the polymer (B) include polystyrene-based polymers, polyacrylate-based polymers, and methylpentene-based polymers. . From the viewpoint of cost and spinnability, polystyrene polymers are most preferred.

Further, the higher the viscosity of the polymer (B) is,
The hollow portion due to partial cutting of the polymer (B), which will be described later, greatly contributes to the softness, resilience, lightness, and heat retention, which is preferable. Further, the polymer (B) has a composition disclosed in
As described in Japanese Patent No. 246247, there is also an advantage that the productivity can be improved by the effect of suppressing the orientation, and from this viewpoint, it is preferable that the viscosity of the polymer (B) is higher. In the case of polystyrene, the melt flow rate (MFR, a smaller value indicates higher viscosity), which is an index of viscosity, is preferably 3.0 or less, more preferably 1.5 or less.

It is important that the polymer (B) is disposed at the core of the core-sheath composite yarn and is not exposed on the fiber surface. When the polymer (B) is exposed on the fiber surface, troubles such as fusing at the time of drawing or yarn processing and dullness when fabric is dyed after dyeing occur. In addition, when the polymer (B) is not a core-sheath composite yarn but a polymer blend, not only the same trouble occurs, but also a decrease in the spinning property due to blend unevenness and unevenness in physical properties are likely to occur. The form of the core-sheath composite may be concentric or eccentric, but concentric circles are preferred in view of composite stability.

If the composite ratio of the polymer (B) disposed in the core to the whole core-sheath composite yarn is 1% by weight or more, the contribution of the hollow portion due to partial cutting of the polymer (B) described later becomes large, and the soft feeling is obtained. This is preferable because it can improve resilience, lightness and heat retention. In addition, the composite ratio is preferably 1% by weight or more from the viewpoint of improving the effect of suppressing the orientation of the polymer (B). However, if the composite ratio of the polymer (B) is excessively high, the spinning property is deteriorated and the yarn strength is reduced. Therefore, the composite ratio of the polymer (B) is preferably 20% by weight or less. In particular, in the case of the modified cross-section fiber, when the alkali is reduced, the polymer (A) in the sheath portion is removed, so that the polymer (B) is easily exposed on the fiber surface. Therefore, the composite ratio of the polymer (B) is preferably 10% by weight or less.

It is important that the low shrinkage polyester thick yarn of the present invention has the following shrinkage characteristics. First of all B
It is important that WS is between 4 and 10%. BWS is 1
If it is more than 0%, the shrinkage is too high, and when blended with a high shrinkage polyester yarn, sufficient swelling cannot be obtained. If the BWS is less than 4%, the shrinkage is too low, and when mixed with a high shrinkage polyester, a loop is formed on the surface of the yarn if a twist-prevention set or the like is performed, resulting in a trouble in the knitting and weaving process. A BWS of 5 to 8% is preferable because these two requirements can be highly satisfied. Second, DSA
B is 0% or less, that is, it is important that the yarn elongates when the yarn after boiling water shrinkage is subjected to high-temperature dry heat treatment. Normally, when the low-shrinkage polyester mixed yarn is twisted, when both the low-shrinkage polyester thick yarn and the high-shrinkage polyester yarn shrink, the low-shrinkage polyester thick yarn is pulled by the high-shrinkage polyester yarn and the shrinkage difference is hardly developed. . However, DSAB is 0
% Or less, the low-shrinkage polyester yarn extends in the opposite direction to the high-shrinkage polyester yarn, so that even in a twisted state, a difference in shrinkage from the high-shrinkage polyester yarn is easily exhibited, and the sense of swelling is further increased. When DSAB is larger than 0%, such an effect cannot be obtained, and only a fabric having poor swelling and softness can be obtained. Third, BWS + DSAB
It is important that is less than 8%. This is to obtain sufficient swelling when blended with a high shrinkage polyester yarn as in BWS. BWS + DSAB is preferably 2
~ 7%. Note that BWS + DSAB is the BWS value and D
This is the sum of the SAB values, and corresponds to the total shrinkage when the yarn is continuously subjected to boiling water treatment and dry heat treatment.

It is important that the low-shrinkage polyester thick yarn of the present invention has a Worster spot (U%) of 2.5% or more. Here, U% is USTE manufactured by Zellweger.
This is a value indicating the degree of fineness of the yarn, which was measured in the normal mode while supplying the yarn at a speed of 8 m / min using RTESTER 1 Model C. If the U% is less than 2.5%, the feeling of heat and dryness when the low-shrink polyester thick yarn of the present invention is used alone is insufficient. U% is preferably 4.0% or more. Further, the period of the thick part and the detail observed in the U% measurement is preferably several cm to several tens cm. This can be evaluated at intervals at which a sudden portion occurs in the U% measurement chart as shown in FIG. In addition, if there is a change in fineness of a super long pitch of several tens of meters apart from this, a more subtle feeling is added, which is preferable. This is also US made by Zellweger
TER TESTER 1 Using ModelC, 2
It can be evaluated by the wavelength of the wave (fineness change cycle) observed when the measurement is performed in the half mode while feeding the yarn at a speed of 00 m / min (FIG. 4).

In the low shrinkage polyester yarn of the present invention, it is particularly important that the polymer (B) disposed in the core part has a hollow part by being cut. One example of this is shown in FIG. 1, in which a solid portion in which the polymer (B) is present and a hollow portion in which the polymer (B) is cut to form voids are alternately present on the order of several tens of μm. . The presence of the hollow portion on the order of several tens of μm lowers the bending rigidity as compared with a normal solid yarn, and provides a sufficient softness even if the yarn is stretched to 100% or less. The feeling is expressed. In addition, this hollow portion serves as a cushion, and not only improves the soft feeling, but also dramatically improves the rebound feeling of the yarn.
If the average length of the solid portion is 10 to 100 μm and the average length of the hollow portion is 5 to 100 μm, the softness and resilience are further improved, which is preferable. Here, the hollow portion refers to a portion having a length of 1 μm or more, and a crack that may enter a solid portion in some places is not included in the hollow portion. In addition, when the hollow part is slightly crushed, it becomes a very fine thread that is super-fine, in which the thick part / detail is alternately arranged on the order of several tens of μm, which is incomparable to the conventional thick and thin thread. It is preferable because of its delicate soft and dry feel and beautiful gloss due to irregular reflection of light. FIG. 2 is a side view photograph of the low shrinkage polyester yarn of the present invention under a polarizing microscope. The appearance of interference fringes is different between a solid portion and a hollow portion. This indicates that the orientations of the solid portion and the hollow portion are different from each other, and there has been no yarn having a different orientation in the yarn longitudinal direction at an ultrafine pitch of the order of several tens of μm. As a result, the unique delicate soft and dry tactile sensation and the beautiful luster due to the irregular reflection of light, which could never be obtained with a conventional thick thread, are further emphasized, which is preferable. Also, usually PE
The specific gravity of the T yarn is about 1.37, but the low shrinkage polyester yarn of the present invention has a hollow portion, and the apparent specific gravity is apparent when a lightweight polymer such as polystyrene or polymethylpentene is used as the polymer (B). However, it is one of the features of the present invention that it is smaller than ordinary PET yarn, and a large lightening effect can be obtained. The specific gravity of polystyrene is 1.1 and that of polymethylpentene is 0.8. Further, the heat retention is improved by the hollow portion as compared with the ordinary solid PET yarn.

It is important that the low shrinkage polyester yarn of the present invention has an elongation of 60 to 100% in view of the versatility of subsequent processing. If the elongation exceeds 100%, a problem as in the prior art occurs, and if the elongation is less than 60%, the soft feeling is impaired. The elongation is preferably 70 to
80%.

The cross-sectional shape of the low shrinkage polyester yarn of the present invention is not particularly limited.
Irregular sections such as molds and W-shaped sections, hollow sections, and the like can be employed. To get a dry and squeaky feeling,
A multi-leaf section such as Yatsuha is preferred. In order to further enhance the silky luster, a trilobal section is particularly preferred. The single-fiber fineness is also not particularly limited, but considering the case where the single-fiber fineness is used as a sheath yarn of mixed fiber, the single-fiber fineness is preferably 0.3 to 5.0 dtex. More preferably, it is 0.6 to 3.0 dtex.

Although the low shrinkage polyester yarn of the present invention can be used alone, it can be mixed with a high shrinkage polyester yarn having a higher BWS + DSAB. As a result, a higher level of swelling can be added to the above characteristics, and the softness and the resilience can be improved. When the BWS + DSAB of the high shrinkage polyester yarn is 12% or more, it is more excellent in swelling feeling and is preferable.

Further, when the U% of the mixed fiber is 1.5% or less, unlike a marbling-like fabric surface obtained by a so-called conventional thick and thin yarn, the surface is apparently beautiful without any dye spots. It is preferable to obtain a fabric rich in surface aesthetics which shows a subtle change in color when viewed closely. U of mixed fiber
% Is more preferably 1.0% or less. In particular, such characteristics are easily exhibited in the mixed fiber obtained by the spinning method. The reason why the spun mixed fiber of the present invention has such a unique property is not clear, but it is presumed that the drawing tension share during the mixed fiber drawing is different from that in the case of drawing a single yarn.

Further, when a polyester yarn having crimp is used as the polyester yarn mixed with the low shrinkage polyester yarn of the present invention, rich swelling, stretchability and resilience with a texture different from the high shrinkage polyester yarn are obtained. It is possible to give. It is more preferable to use a latently-crimped yarn formed by side-by-side composite as the polyester yarn having this crimp, because the resilience is further improved. Further, when a polyester yarn having excellent stretchability such as polytrimethylene terephthalate or polytetramethylene terephthalate is used as the high shrinkage polyester yarn, the texture becomes excellent in resilience, which is different from the high shrinkage polyester yarn and is preferable. .

In the case where the mixed yarn is formed by air entanglement, if the entanglement degree of the mixed yarn is set to 20 or less, the degree of freedom of the yarn is increased, and the low shrinkage yarn and the high shrinkage yarn are used during the scouring or intermediate setting of the fabric. This is preferable because a difference in shrinkage ratio of shrinkable yarn is easily exhibited. The degree of confounding is preferably 10 or less.

As a fiber mixing method, a spinning fiber mixing method in which a low shrinkage polyester yarn and a high shrinkage polyester yarn are spun from the same die is preferable because the cost is much lower than that of the post-fiber mixing method. It is also possible to separately manufacture the low-shrink yarn and the high-shrink yarn, and then to perform the blending after using the interlace nozzle, but to improve the blending of the low-shrink yarn and the high-shrink yarn, A high degree of entanglement is applied to suppress the slack of the yarn surface, and the degree of entanglement often becomes 20 or more.
Even if it is reduced to 0 or less, there is also an advantage that the fiber separation is good and the yarn surface does not loosen. Of course, a fiber blending method such as using a Taslan nozzle or ply twisting or composite false twisting can of course be employed.

The low shrinkage polyester yarn of the present invention can be obtained, for example, by the following production method. That is, a core-sheath composite yarn in which polystyrene is provided in the core as the low shrinkage polyester yarn and PET containing calcium acetate as the compound having the ability to form internal particles is provided in the sheath portion, and isophthalic acid (IPA) is used as the high shrinkage polyester yarn. The copolymerized PET yarn is spun from the same die as a spun mixed yarn at a spinning temperature of 280 to 300 ° C and a spinning speed of 2500 to 6000 m / min, and the mixed POY is once wound. This mixed fiber POY
At a stretching temperature of 80 to 105 ° C. and a heat setting temperature of 110 to 13
Stretch at 0 ° C. At this time, the stretching ratio is set so that the elongation of the low shrinkage polyester yarn is 60 to 100%. In addition, it is of course possible to employ a direct spinning drawing method in which the spun yarn is drawn without being wound once.

The yarn obtained by the present invention is made into a fabric such as a woven or knitted fabric, and is suitably used for clothing such as blouses, suits, pants and coats.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. In addition, the measuring method in an Example used the following method. Intrinsic viscosity [η] Measured at 25 ° C. in orthochlorophenol. B. Melt flow rate (MFR) Measured at 200 ° C. under a load of 5 kg according to ISO R 1133. C. Shrinkage boiling water shrinkage _{(BWS) = [(L 0} -L 1) / L 0)] ×
100 Dry heat shrinkage after boiling water shrinkage (DSAB) = [(L ₁ -L ₂ )
/ L ₁ )] × 100 L ₀ : The original length of the skein which has been skeined and measured under an initial load of 0.09 cN / dtex. L ₁ : The skein which has been measured for L ₀ is substantially free of load and is in boiling water. For 15 minutes, and after air drying, initial load 0.09 cN
Skew length under / dtex L ₂ : The skein measured L ₁ was treated with dry heat (180 ° C.) for 15 minutes in a substantially load-free state, and the initial load was 0.09 c.
Skew length under N / dtex Elongation A load-elongation curve was determined according to JIS standard L1013, and the elongation was divided by the initial sample length to obtain the elongation. E. FIG. Observing the average length of the solid and hollow fiber sides over 200 μm with an optical microscope,
Then, the lengths of the solid portion and the hollow portion are measured. 100 each
Measure each part and determine the average value. F. U% (Worcester spots) USTER TESTER manufactured by Zellweger
The measurement was performed in the normal mode while supplying the yarn at a speed of 8 m / min using 1 Model C. G. FIG. Degree of confounding Take out a yarn of appropriate length and apply 0.089 cN / d to the lower end.
A load of tex (0.1 gf / d) is applied. Then, a suitable needle is inserted into the thread and gently lifted, and the distance (cm) at which the needle stops is measured 100 times, and the average value L
(Cm) is calculated, and the degree of confounding is calculated by the following equation. Degree of confounding = 100 ° (2 × L) Fabric Evaluation Sensory evaluation was performed on grades 1 to 5 for the swelling, softness, resilience, lightness, and heat retention of the obtained fabric.

Example 1 Homo-PET containing 0.07% by weight of PET based on PET as a compound having internal particle-forming ability with [η] = 0.63 as a polymer (A) and not containing titanium oxide
(Bright PET) and “STYRON” 685 (MF), a polystyrene manufactured by Asahi Kasei Corporation, as the polymer (B).
R = 2.1) was used. On the other hand, IPA was used as a polymer to form a high-shrinkage polyester yarn in an amount of 8 m with respect to all acid components.
ol%, bisphenol A ethylene oxide adduct (B
PA-EO) was copolymerized with 3 mol of all glycol components, and a high shrinkage PET having no titanium oxide and [η] = 0.65 was used. Then, as the low shrinkage polyester yarn side, a core-sheath composite yarn obtained by melting the bright PET at 295 ° C. and disposing the polystyrene at 210 ° C. and disposing it on the core of the trilobal cross section at a spinning temperature of 295 ° C. Discharged at 290 ° C. At this time, the polystyrene composite ratio was set to 4.5% by weight based on the weight of the entire core-sheath composite yarn. On the other hand, the high-shrinkage PET was melted at 285 ° C. as the high-shrinkage polyester yarn side, and was discharged as a trilobal cross-section yarn at a spinning temperature of 290 ° C. from the same die 3 as the low-shrinkage polyester yarn side (FIG. 5). At this time, all three types of polymers were filtered using a stainless steel nonwoven fabric filter 2 having an absolute filtration diameter of 15 μm, and then guided to a base 3. Then, after the bundle was refueled 1.8 g below the base by the guide refueling device 6, confounding was given by the interlace nozzle 7. The supply air pressure to the interlace nozzle was 0.07 MPa. And the spinning speed 3000m /
Minutes, low shrinkage polyester yarn side 46 dtex, 18 filaments, high shrinkage polyester yarn side 46 dtex, 18
The mixed fiber POY was wound into a filament. At this time, the peripheral speeds of the first roller 8 and the second roller 9 were the same, and this was used as the spinning speed.

This mixed fiber POY was subjected to a stretching heat treatment using a stretching machine having a pair of hot rollers (FIG. 6). At this time, the stretching ratio was 1.63 times, and the first hot roller (1H
R) The temperature was 97 ° C, the second hot roller (2HR) temperature was 122 ° C, the stretching speed was 950 m / min, and the yarn was wound around the hot roller six times.

The physical properties of the obtained mixed yarn are shown in Table 1. The low shrinkage polyester yarn has a sufficiently low BWS and a negative DSAB, which is an excellent shrinkage property. And excellent shrinkage characteristics. The low-shrinkage polyester yarn has U% = 4.2%, and the polystyrene disposed on the core is cut to form a hollow part, and several cm to several tens cm in the yarn longitudinal direction.
In addition to the fineness of the order, it had a thickness of several tens of μm and uneven alignment. This was subjected to a weak twist having a twist coefficient of 3000, and a twist preventing set was performed with steam. This was used for warp and weft to make plain weave. And 9
After shrinking by relaxing scouring in hot water at 0 ° C, 18
An intermediate set was performed at 0 ° C. And according to the usual law 2
After the alkali weight reduction of 0% by weight, a blue dyeing was carried out using a disperse dye in the usual manner. The obtained fabric has a delicate swelling feeling, and is excellent in softness and resilience,
Moreover, a delicate dry touch was obtained and the texture was excellent. Also, it was excellent in lightness and heat retention. Furthermore, it has a beautiful silk-like luster due to the effects of the trilobal section and the internal particles, and at first glance it looks like there is no staining spot, but when viewed closely, it shows a fine change in color and is excellent in fabric surface aesthetics. Was.

[0031]

[Table 1]

[0032]

[Table 2]

Example 2 Stretching was carried out in the same manner as in Example 1 except that the 2HR temperature was 115 ° C. The physical properties of the obtained mixed yarn are shown in Table 1. The low shrinkage polyester yarn has a sufficiently low BWS and a negative value of DSAB, which is an excellent shrinkage property. Shrinkage properties. Further, the low-shrinkage polyester yarn has U% = 4.3%, and the polystyrene disposed in the core is cut to form a hollow part partially, and has a thickness of several cm to several tens cm in the yarn longitudinal direction. In addition to the fineness, the film had a thickness of several tens of μm and had uneven alignment. Using this, a fabric was produced in the same manner as in Example 1. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. Furthermore, it has a beautiful silk-like luster due to the effects of the trilobal section and the internal particles, and at first glance it looks like there is no staining spot, but when viewed closely, it shows a fine change in color and is excellent in fabric surface aesthetics. Was. However, because of the high shrinkage of the low shrinkage polyester yarn, the feeling of swelling was one step further than in Example 1.

Example 3 Using the apparatus shown in FIG. 7, spinning was performed directly, and spinning was performed in the same manner as in Example 1 except that the die and the discharge amount were changed. At this time, the first
Hot Nelson roller (1HNR) speed 2700m
/ Second, the speed of the second hot Nelson roller (2HNR) is 4700 m / min, the temperature of the 1HNR is 105 ° C., the temperature of the 2HNR is 138 ° C.
Winding was performed at a speed of 4655 m / min. The resulting mixed yarn had a low shrinkage polyester yarn having a trilobal cross section of 56 dtex and 72 filaments, and a high shrinkage polyester yarn having a 33 dtex and 12 filaments. The physical properties are shown in Table 1. The low shrinkage polyester yarn had a sufficiently low BWS and a negative value of DSAB, which was an excellent shrinkage property. The high shrinkage polyester yarn also had a sufficiently high shrinkage rate and an excellent shrinkage property. U% = 2.
9%, and further, the polystyrene disposed in the core is cut to form a hollow part partially, and several c in the yarn longitudinal direction.
In addition to the thickness of about m to several tens of cm, it had a thickness of about several tens of μm and an uneven alignment. Using this, a fabric was produced in the same manner as in Example 1. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. In addition, it has a beautiful silky luster due to the effect of the trilobal section and internal particles,
In addition, although it appears that there is no staining spot at first glance, the fabric surface is excellent in aesthetics showing a slight change in color when viewed closely.

Example 4 The polymer used on the high shrinkage polyester yarn side was high shrinkage P
From the ET, homopolybutylene terephthalate (homo-PBT) containing no titanium oxide [η] = 0.90 and a draw ratio of 1.40 times were subjected to spinning and drawing heat treatment as in Example 1. The physical properties of the obtained mixed fiber are shown in Table 1. The low shrinkage polyester yarn has a sufficiently low BWS and a low DSA.
B also became a negative value and was an excellent shrinkage property, and the high shrinkage polyester yarn side also had a sufficiently high shrinkage rate and an excellent shrinkage property. Further, the low-shrinkage polyester yarn has U% = 4.5%, and the polystyrene disposed in the core is cut to form a hollow part, and several cm to several tens in the longitudinal direction of the yarn.
In addition to the thickness of about 0 cm, it had a thickness of several tens of μm and a variation in alignment. Example 1 using this
A fabric was produced in the same manner as described above. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. Furthermore, it had a beautiful silky luster due to the effect of the trilobular section and internal particles. Furthermore, since the low shrinkage polyester yarn is an ultrafine yarn, a unique powder touch and soft feeling can be obtained, and the PBT used as the high shrinkage polyester yarn exhibits good stretchability, and additionally provides a different color effect, The appearance was rich in surface changes.

Example 5 The polymer used for the high shrinkage polyester yarn was a high shrinkage P
ET containing 0.05% by weight of titanium oxide, and 2.5 mol of 5-sodium sulfoisophthalic acid based on all acid components
% Copolymerizable [η] = 0.67 cationic dyeable PET
In the same manner as in Example 1, spinning and drawing heat treatment were performed at a draw ratio of 1.50 and a 2HR temperature of 125 ° C. The physical properties of the obtained mixed yarn are shown in Table 1. The low shrinkage polyester yarn has a sufficiently low BWS and a negative value of DSAB, which is an excellent shrinkage property. Shrinkage properties. The low-shrinkage polyester yarn has a U% of 4.5%, and the polystyrene disposed on the core is cut to form a hollow part, and a thick portion of about several cm to several tens cm in the yarn longitudinal direction. In addition to the fineness, the film had a thickness of several tens of μm and had uneven alignment. Using this, a fabric was produced in the same manner as in Example 1. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. Furthermore, it had a beautiful silky luster due to the effect of the trilobular section and internal particles. In addition, the cationic dyeable yarn used as the high shrinkage polyester yarn provided a different color effect, resulting in an appearance rich in surface change.

Example 6 Stretching was carried out in the same manner as in Example 1 except that the 1 HR temperature was 90 ° C. The physical properties of the obtained mixed yarn are shown in Table 1. The low shrinkage polyester yarn has a sufficiently low BWS and a negative value of DSAB, which is an excellent shrinkage property. Shrinkage properties. Further, the low-shrinkage polyester yarn has U% = 7.5%, and the polystyrene disposed in the core is cut to form a hollow part, and a thick portion of several cm to several tens cm in the yarn longitudinal direction. In addition to the fineness, the film had a thickness of several tens of μm and had uneven alignment. Using this, a fabric was produced in the same manner as in Example 1. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. In addition, it has a beautiful silky luster due to the effect of the trilobal section and internal particles. However, since the U% of the mixed fiber was as high as 2.3%, the aesthetics of the fabric surface was one step further than that of Example 1.

Comparative Example 1 The polymer used for the high shrinkage polyester yarn was high shrinkage P
From the ET, the bright PET used in Example 1 was used, and the spinning and drawing heat treatment were performed in the same manner as in Example 1 except that the 2 HR temperature in drawing was 145 ° C. Table 1 shows the physical properties of the obtained mixed fiber.
As shown in the figure, DSAB> 0% for the low shrinkage polyester yarn, and the shrinkage ratio of the high shrinkage polyester yarn was low. Using this, a fabric was produced in the same manner as in Example 1.
The resulting fabric was inferior in swelling, softness and resilience.

Example 7 As the polymer (A), a homo PET (semi-dal PET) containing 0.30% by weight of titanium oxide with respect to PET without [η] = 0.63 and containing no compound capable of forming internal particles was used. As the polymer (B), "Styrone" 685 (MFR = 2.1), which is a polystyrene manufactured by Asahi Kasei Corporation, was used.
Then, PET was melted at 290 ° C. and polystyrene was melted at 210 ° C., and filtration was performed using a stainless steel nonwoven fabric filter 2 having an absolute filtration diameter of 15 μm. The concentric core-sheath composite yarn was discharged at a spinning temperature of 290 ° C. (FIG. 8). At this time, the composite ratio of polystyrene was 7% by weight. Then, after converging and refueling with the guide refueling device 6 1.8 m below the base, confounding is given by the interlace nozzle 7,
The spinning speed is set to 5000 m / min, and the yarn is taken up.
The dtex, 24 filament POY was wound (FIG. 8). At this time, the peripheral speeds of the first roller 8 and the second roller 9 were the same, and this was used as the spinning speed. The supply air pressure to the interlace nozzle was 0.30 MPa.

The POY was subjected to a stretching heat treatment using a stretching machine having a pair of hot rollers (FIG. 6). At this time,
Stretch ratio is 1.35 times, 1st hot roller (1HR)
The temperature is 95 ° C, the second hot roller (2HR) temperature is 1
The yarn was wound six times around a hot roller at 28 ° C. and a stretching speed of 950 m / min.

The physical properties of the obtained low-shrinkage polyester yarn are shown in Table 3. As a result, BWS was sufficiently low and DSAB was a negative value, indicating excellent shrinkage characteristics. The low-shrinkage polyester yarn is U% = 4.1%, and the polystyrene disposed in the core is cut to form a hollow part, and a thick portion of about several cm to several tens cm in the yarn longitudinal direction. In addition to the fineness, the film had a thickness of several tens of μm and had uneven alignment. 33 dt separately prepared with this low shrinkage polyester yarn
Ex and 12 filaments of BWS + DSAB = 15% high shrinkage homo PET yarn were mixed with air using an interlace nozzle to obtain a polyester mixed yarn. This was subjected to weak twisting with a twist coefficient of 4000, and a twist-stopping set was performed at a dry heat of 80 ° C. Then, a tubular knitting was prepared using this, and the alkali was reduced by 10% by weight according to a conventional method, and then blue was dyed with a disperse dye. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Furthermore, although it appeared that there was no staining spot at first glance, the fabric surface was excellent in aesthetics showing a slight change in color when viewed closely. Also, it was excellent in lightness and heat retention.

[0042]

[Table 3]

[0043]

[Table 4]

Example 8 Spinning was carried out in the same manner as in Example 7 except that the composite ratio of polystyrene was 12% by weight and the discharge amount was changed, and a 90 dtex, 24 filament POY was wound up. Using this POY,
Stretching was performed in the same manner as in Example 7, except that the stretching ratio was 1.65 times. However, although within the allowable range, yarn breakage occurred during the spinning and drawing processes.

The physical properties of the obtained low-shrinkage polyester yarn are shown in Table 3. The BWS was sufficiently low, and the DSAB was a negative value, indicating excellent shrinkage characteristics. . Further, the low-shrinkage polyester yarn has U% = 6.1%, and the polystyrene disposed in the core is cut to form a hollow part partially,
In addition to the thickness of several cm to several tens of cm in the longitudinal direction of the yarn, the yarn had a thickness of several tens of μm and unevenness of orientation. Using this low-shrinkage polyester yarn, it was mixed with a high-shrinkage polyester yarn in the same manner as in Example 7, to obtain a polyester mixed yarn, and twisted. Using this, a tubular knit was produced in the same manner as in Example 7. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. In particular, lightness and heat retention were superior to those of Example 7.

Example 9 Spinning was performed in the same manner as in Example 7 except that the composite ratio of polystyrene was 2% by weight, and the discharge amount was changed, and a 60 dtex, 24-filament POY was wound up. Using this POY,
Stretching was performed in the same manner as in Example 7 except that the stretching ratio was 1.05.

The physical properties of the obtained low-shrinkage polyester yarn are shown in Table 3. As a result, BWS was sufficiently low and DSAB was a negative value, indicating excellent shrinkage characteristics. . The low-shrinkage polyester yarn has U% = 2.5%, and the polystyrene disposed on the core is cut to form a hollow part,
In addition to the thickness of several cm to several tens of cm in the longitudinal direction of the yarn, the yarn had a thickness of several tens of μm and unevenness of orientation. Using this low-shrinkage polyester yarn, it was mixed with a high-shrinkage polyester yarn in the same manner as in Example 7, to obtain a polyester mixed yarn, and twisted. Using this, a tubular knit was produced in the same manner as in Example 7. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. However, swelling, softness, resilience, lightness, and heat retention were one step further than in Example 7.

Example 10 Polystyrene "STYRON" manufactured by Asahi Kasei Corporation
Spinning was carried out in the same manner as in Example 7 except that the discharge amount was changed to 8259 (MFR = 1.1), and a 85 dtex, 24 filament POY was wound up. Using this POY, stretching was performed in the same manner as in Example 1 except that the stretching ratio was 1.52 times. However, although within the allowable range, yarn breakage occurred during the spinning and drawing processes.

The physical properties of the obtained low-shrinkage polyester yarn are shown in Table 3. As a result, BWS was sufficiently low and DSAB was a negative value, indicating excellent shrinkage characteristics. In addition, the polystyrene disposed on the core part was partially cut more than in Example 7, and the degree of thick and fine spots and alignment unevenness was larger than that of Example 7. Using this low-shrinkage polyester yarn, it was mixed with a high-shrinkage polyester yarn in the same manner as in Example 7, to obtain a polyester mixed yarn, and twisted. Example 7 using this
A tubular knit was prepared in the same manner as described above. The resulting fabric had a delicate swelling feeling, was excellent in softness and resilience, and had a delicate dry touch and an excellent texture. Also, it was excellent in lightness and heat retention. In particular, lightness and heat retention were superior to those of Example 7.

Comparative Example 2 Stretching was carried out in the same manner as in Example 7 except that the stretching ratio was 1.70 times and the stretching temperature was 100 ° C. The physical properties of the obtained yarn are shown in Table 3, where U% = 1.5% and DSAB was a positive value. This low shrinkage polyester yarn was mixed with a high shrinkage polyester yarn using an interlace nozzle (supply air pressure 0.30 MPa) in the same manner as in Example 7 to obtain a polyester mixed yarn and twisted. Using this polyester mixed yarn, a tubular knit was produced in the same manner as in Example 7. The obtained fabric had poor swelling, softness and resilience. Moreover, the heather feeling was poor.

Comparative Example 3 Stretching was carried out in the same manner as in Example 7 except that the stretching ratio was 1.20. The physical properties of the obtained yarn are shown in Table 3, and the elongation was excessively large. This low shrinkage polyester yarn was mixed with a high shrinkage polyester yarn in the same manner as in Comparative Example 2 to obtain a polyester mixed yarn and twisted. Using this polyester mixed yarn, a tubular knit was produced in the same manner as in Example 7. However, since the BWS of the low-shrinkage polyester was excessively low and the elongation was excessively high, the low-shrinkage polyester yarn formed a loop on the yarn surface. Many yarn breaks occurred during the making and knitting process.

Comparative Example 4 After completion of the esterification reaction of PET, 1 wt% of sodium alkylbenzenesulfonate having 15 carbon atoms was added, and homo PET containing 0.25 wt% of titanium oxide and [η] = 0.67 alone was used. The yarn is spun at a temperature of 290 ° C. and a spinning speed of 3000.
m / min, spin at 62 dtex, 24 filaments P
The OY was wound up. This was subjected to contact heat treatment at a heater temperature of 120 ° C. and a processing speed of 100 m / min under a tension of 1.10 and a tension of 0.09 cN / dtex using the apparatus of FIG. The physical properties of the obtained fiber are shown in Table 3, but the elongation was excessively high. This low shrinkage polyester yarn was mixed with a high shrinkage polyester yarn in the same manner as in Comparative Example 2 to obtain a polyester mixed yarn and twisted. A tubular knitting was made using this polyester mixed yarn in the same manner as in Example 7, but since the elongation was excessively high, a low-shrinkage polyester yarn formed a loop on the yarn surface, and the yarn was frequently broken during the knitting process. The obtained fabric was poor in resilience, lightness, and heat retention.
Furthermore, it did not have a beautiful marbling-like heather feeling but had a dirty cloth surface dotted with spot-like deeply dyed portions.

[0053]

The use of the low-shrinkage polyester yarn of the present invention provides high processability, excellent softness, swelling, and resilience, as well as excellent wearing comfort such as lightness and heat retention. It can provide a high quality fabric.

[Brief description of the drawings]

FIG. 1 is a view showing that a core portion of a low-shrinkage polyester yarn of the present invention is partially cut.

FIG. 2 is a view showing ultra-fine orientation unevenness of the low shrinkage polyester yarn of the present invention.

FIG. 3 is an example of a U% chart based on normal mode measurement at a yarn feeding speed of 8 m / min.

FIG. 4 is an example of a U% chart based on half mode measurement at a yarn feeding speed of 200 m / min.

FIG. 5 is a diagram showing a mixed fiber spinning and winding device.

FIG. 6 is a view showing a stretching device.

FIG. 7 is a diagram illustrating a direct spinning drawing apparatus.

FIG. 8 is a diagram illustrating a spinning and winding device.

FIG. 9 is a diagram illustrating a contact heat treatment apparatus.

[Explanation of symbols]

 1: spin block 2: non-woven fabric filter 3: base 4: chimney 5a: low shrinkage polyester yarn side yarn 5b: high shrinkage polyester yarn side yarn 6: lubrication guide 7: interlace nozzle 8: first roller 9: second roller 10: Winding yarn 11: Supply yarn 12: Feed roller 13: First hot roller (1HR) 14: Second hot roller (2HR) 15: Cold draw roller 16: Draw yarn 17: First hot Nelson roller (1HNR) 18: Second hot Nelson roller (2HNR) 19: Winding yarn 20: Contact heater 21: Delivery roller 22: Heat treated yarn

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) D02G 3/36 D02G 3/36 F term (reference) 4L036 MA05 MA15 MA20 MA26 MA39 PA01 PA03 PA26 PA42 RA03 RA14 UA01 UA30 4L041 AA07 AA20 AA22 BA02 BA05 BA21 BA38 BA41 BA52 BB05 BC04 BC05 BC20 CA06 CA12 CA47 CB05 CB06 DD01 DD10 DD14 DD21 4L045 AA05 BA15 BA18 BA25 BA45 CA09

Claims (7)

[Claims] 1. A core-sheath in which a polymer (A) which is substantially a polyester is disposed in a sheath, and a polymer (B) in which the temperature dependence of elongational viscosity is larger than that of the polymer (A) is disposed in a core. A composite yarn having a continuous thick part and details in the longitudinal direction of the yarn, and having a hollow part partially by cutting the polymer (B) disposed on the core part. A low-shrink polyester thick yarn having the following characteristics. Boiling water shrinkage = 4-10% Dry heat shrinkage after boiling water shrinkage ≦ 0% Boiling water shrinkage + dry heat shrinkage after boiling water shrinkage ≦ 8% Elongation = 60-100% U% ≧ 2.5% 2. The polymer according to claim 1, wherein the length of the solid portion of the polymer (B) disposed on the core portion is 10 to 100 μm on average, and the length of the hollow portion is 5 to 100 μm on average. Low shrink polyester thick yarn. 3. The low-shrink polyester thick yarn according to claim 1, wherein the polymer (B) is a polystyrene-based polymer. 4. The low-shrink polyester thick yarn according to claim 1, wherein the polymer (A) contains a compound capable of forming internal particles. 5. A polyester blended yarn comprising the polyester thick yarn according to any one of claims 1 to 4 and a high shrinkage polyester yarn having the following shrinkage ratio. Boiling water shrinkage + Dry heat shrinkage after boiling water shrinkage ≧ 12% 6. The polyester mixed fiber yarn according to claim 5, wherein U% of the mixed fiber is 1.5% or less. 7. The polyester blended yarn according to claim 5, wherein the degree of entanglement is 20 or less.