JP2001123343A - Polyester blended multifilament yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester blended multifilament yarn capable of giving woven/knitted fabrics with sufficient puffiness and soft touch through simultaneously manifesting three-dimensional crimps and self-elongation and also manifesting crimps in a core yarn by heat treatment under dyeing and fishing operation. SOLUTION: This polyester blended multifilament yarn comprising a sheath yarn (a) and a core yarn (b) and having 0.5-5 slack(s) and/or loop(s)/cm on the whole yarn surface is characterized by that the sheath yarn (a) consists of a multifilament yarn manifesting three-dimensional crimps 2-10% in stretch elongation (CS) and >=60% in stretch elongation recovery (CD) and simultaneously manifesting self-elongation at 0-10% in the yarn axial direction by dry heat treatment at >=130 deg.C or heat treatment equivalent thereto, and the core yarn (b) consists of a polyester multifilament yarn exhibiting shrinkage at >=10% and at the same time manifesting the number of crimps at 2-10/cm by the above heat treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latently three-dimensional crimp-developing self-extended mixed fiber yarn composed of polyester multifilament yarn. More specifically, the present invention relates to a non-crimp yarn during weaving or knitting. By performing ordinary dyeing processing after weaving and knitting, the sheath yarn exhibits three-dimensional crimping and self-elongation at the same time, and the core yarn also exhibits crimping, so that the woven and knitted fabric has unprecedented swelling and softness. The present invention relates to a polyester mixed fiber yarn capable of giving a feeling and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, many woven or knitted fabrics using polyester multifilaments have been put on the market from thin to medium-thick fabrics. It's being used.

[0003] As means for obtaining a woven or knitted fabric rich in swelling or softness, weaving and knitting is performed by using a filament obtained by blending or twisting a filament which contracts by heat treatment with a core yarn and a filament which exhibits self-extensibility with a sheath yarn. A number of proposals have been known for embossing the self-extensible yarn of the sheath yarn on the surface of the woven or knitted fabric by a heat treatment such as a dyeing process, for example, Japanese Patent Publication No. Hei 4-1097 and Japanese Patent Publication No. Hei 4-18051. Has been proposed and has a certain effect.

[0004] However, in the methods proposed in these, the sheath yarn component exhibits self-extensibility due to the progress of crystal orientation by heat treatment such as a dyeing process, but the self-extensible constituent filaments are uniformly formed. Since it stretches in the fiber axis direction, it not only has a uniform surface feeling, but also needs a large self-extensibility to obtain a sufficient swelling feeling, and as a result, glue and twist prevention set in the weaving preparation process At the stage of the above, the sheath yarn was thermally elongated, which was accompanied by a decrease in processability such as poor opening on the loom.

[0005] In addition, if the heat shrinkage is increased to obtain a difference in yarn length from the sheath yarn, the core yarn has a disadvantage that the core yarn tends to have a hard feeling with a core.

Accordingly, Japanese Patent Application Laid-Open Nos. 8-325871 and 9-3739 propose a method of imparting a sufficient swelling feeling to a woven or knitted fabric and imparting a crimp to the yarn so as not to exhibit simple and uniform self-extensibility. Gazette, JP-A-9-21026
Although it is made according to Japanese Unexamined Patent Application Publication No. H10-150, it has a crimp already at the stage before the heat treatment, so that it is as strong as a normal temporary twisted yarn, or has a crimp after heat treatment. However, not only is the crimp developing power weak,
Due to the dimensional crimping, the bulkiness could not be sufficiently exhibited under the binding force of the fabric. Therefore, the present inventors have proposed a method for simultaneously expressing three-dimensional crimping and self-extensibility in a sheath yarn by boiling water treatment and / or dry heat treatment at the time of dyeing processing or heat treatment equivalent thereto, as disclosed in Japanese Patent Application Laid-Open No. 3
No. 17245, it was possible to achieve a material which does not show uniform self-extensibility. However, it is hard to say that the development of swelling is sufficient, and the yarn processing step becomes complicated in order to obtain a mixed fiber. Had.

[0007] Japanese Patent No. 2930606 discloses a method for producing a mixed fiber by a false twist drawing technique at a temperature not higher than the glass transition temperature, but this is a proposal for a composite false twist yarn between undrawn yarns. Since the difference in elongation is small, it is not completely satisfactory in terms of the appearance of a yarn length difference for imparting sufficient swelling to the woven or knitted fabric.

[0008]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems, the present invention relates to a method of fabricating a yarn after knitting while having a thread and / or a loop on the surface of the mixed fiber which does not reduce the processability during weaving. By carrying out the usual dyeing process of
The sheath yarn substantially expresses three-dimensional crimp and self-extensibility at the same time as the core yarn also expresses crimp at the same time. In addition, the present invention provides a polyester mixed fiber yarn having sufficient swelling and softness when formed into a woven or knitted fabric, and a method for producing the same, because the porosity of the mixed fiber yarn can be increased.

[0009]

The polyester mixed yarn of the present invention has the following structure to solve the above-mentioned problems.
(1) The sheath yarn a has a stretch elongation (CS) of 2% or more and 10% or less and a stretch elastic modulus (CD) of 60% or more by a dry heat treatment at 130 ° C or more or a heat treatment equivalent thereto. 0% or more in the direction of the yarn axis at the same time as dimensional crimping
It is composed of a multifilament yarn having a self-extensibility of 0% or less, and the core yarn b shows a shrinkage of 10% or more by a dry heat treatment at 130 ° C. or more or a heat treatment equivalent thereto, and 2 (peaks / cm) to 10 ( The multifilament yarn comprises a polyester multifilament yarn containing a copolymer component exhibiting high shrinkage and exhibiting a crimp of not more than 以上 / cm). Alternatively, a polyester mixed fiber yarn having a loop of 0.5 (pieces / cm) or more and 5 (pieces / cm) or less.

However, CS (%) = ｛(LC2-LC
1) / LC1｝ × 100 CD (%) = ｛(LC2-LC3) / (LC2-LC
1)｝ × 100 Here, LC1: 0.0018 cN after dry heat treatment at 180 ° C.
/ Dtex Length under load (mm) LC2: 0.088cN / dtex after 180 ° C dry heat treatment
Length under load (mm) LC3: 0.0018 cN / dtex again after LC2 measurement
Length under load (mm) (2) After the whole mixed fiber is subjected to boiling water shrinkage treatment, it is subsequently heated to 180 ° C.
The polyester mixed fiber yarn according to the above (1), wherein the difference in the length of the decomposed yarn between the sheath yarn a and the core yarn b after the dry heat shrinkage treatment is 10% or more and 60% or less.

(3) The degree of entanglement of the sheath yarn a and the core yarn b is 60
The polyester mixed fiber yarn according to the above (1) or (2), wherein the fiber is mixed with a confound in the range of (pieces / m) to 170 (pieces / m).

(4) The average breaking elongation of the sheath yarn a is 80%.
(1) to (30) or less.
The polyester blended yarn according to any one of (3).

(5) The above-mentioned (1) to (4), wherein at least a part of the core yarn b is a side-by-side type composite yarn composed of a polymer comprising a copolymer component having high shrinkage. The polyester mixed yarn according to any one of the above.

(6) The birefringence (Δn) of the sheath yarn a is 5
A polyester highly oriented unstretched yarn of 0 × 10 ⁻³ or more and 80 × 10 ⁻³ or less, and a polyester stretched yarn containing a copolymer component exhibiting high shrinkage to become a core yarn b, and a room temperature or more of a sheath yarn a After performing composite false twisting at a yarn temperature below the transition point,
After performing a relaxing heat treatment at 0% or more and 15% or less under a temperature condition where the yarn temperature is 120 ° C or more and 200 ° C or less,
A method for producing a polyester mixed yarn, which comprises performing a confounding treatment.

(7) The polyester mixed fiber yarn according to the above (6), wherein the sheath yarn a is oversupplied in a range of 2% to 15% with respect to the core yarn b during the composite false twisting. Manufacturing method. It is.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

The sheath yarn constituting the polyester mixed fiber yarn of the present invention is a material which simultaneously exhibits sufficient three-dimensional crimping and self-extensibility by a dry heat treatment at 130 ° C. or higher or a heat treatment equivalent thereto after boiling water treatment. is there.

The dry heat treatment at 130 ° C. or higher or a heat treatment equivalent thereto is a range corresponding to the heat treatment employed in the dyeing process of ordinary synthetic fiber woven or knitted fabric. Indicates a high-temperature relaxation treatment under moist heat performed using a dyeing machine or the like and an intermediate setting treatment with a tenter under dry heat performed at 170 to 200 ° C. as an upper limit before alkali weight loss.

In order to increase the resilience of the woven fabric, it is sufficient to increase the change in the void at the intersection of the woven fabric before and after the heat treatment. For this purpose, three-dimensional crimping, which is known for ordinary temporary twisted yarn, is effective. At this time, the stretch ratio (CS) is set to 2% or more, and if it is less than this, the bulking effect is inferior. If it exceeds 10%, the feeling of flapping like a normal temporary twisted yarn is strong. It is not preferable. Further, the elastic modulus of elasticity (CD) at this time is set to 60% or more.
%, It is not preferable because the bulking effect is reduced.

The term "three-dimensional crimp" as used herein refers to a spiral or inverted structure of a single yarn of a normal temporary twisted yarn when a so-called indentation-type folded crimp is defined as a two-dimensional crimp. It is.

The sheath yarn constituting the polyester mixed fiber yarn of the present invention exhibits self-extensibility simultaneously with the appearance of crimp. The term “self-extensibility” as used herein means heat treatment in a state where tension is not applied to the fiber. When the heat treatment is performed, the length of the yarn after heat treatment is longer than that before heat treatment. In addition to the improvement of the yarn and the woven or knitted fabric, the apparent cover factor is dense but has voids, which has the effect of improving the swelling and softness.

In order to impart a large yarn length difference, it is preferable that the self-elongation ratio of the sheath yarn is large. However, if the yarn length difference is too large, the self-elongation ratio becomes zero because the twitching becomes strong.
% Or more and 10% or less.

Next, the polyester mixed fiber of the present invention is treated with the above-mentioned sheath yarn component by boiling heat treatment, followed by a dry heat treatment at 130 ° C. or more, or a heat treatment equivalent thereto.
% Or more, and 2 (peaks / cm) or more and 10 or more.
It is composed of at least two yarns of a core yarn component exhibiting a number of crimps of (peak / cm) or less.

Although the void effect of the yarn itself can be increased by heat shrinkage of the core yarn, the heat shrinkage of the core yarn is 10% or more in consideration of the binding force between the woven fabrics. It is important that there is. For the same reason, the number of crimps is also set to 2 peaks / cm or more.

However, as the number of crimps increases, the bending recovery of the core yarn decreases, and the rebound of the woven fabric decreases. Therefore, the number of crimps of the core yarn is set to 10 (peaks / cm) or less. .

Further, the mixed fiber of the present invention expresses a three-dimensional crimp in order to prevent the filament exhibiting self-extensibility from elongating uniformly and becoming a uniform surface. In order to increase the weight,
Alternatively, a loop is provided to give a large unevenness in the distribution of self-elongation. In order to obtain this effect, there should be at least 0.5 (pieces / cm) of tarmi and / or loops having a diameter of 1/3 or more of the mixed fiber diameter. However, in order to avoid a decrease in processability during weaving, the size should be no more than one time the mixed fiber diameter and the number should be 5 (pieces / cm) or less. In this case, if there is only Talmi, count the number of only Talmi, if there is only a loop, count the number of loops only, and if there are both loop and Talmi, count both the loop and Talmi. I do.

When used in combination with the heat-shrinkable yarn, the above-mentioned sheath yarn component exhibits self-extensibility simultaneously with the appearance of crimp by heat treatment, while the core yarn component undergoes heat shrinkage and exhibits crimp. Therefore, the expansion of the void of the yarn itself can be increased.

Further, as a whole, the mixed fiber yarn of the present invention is subjected to a dry heat treatment at 180 ° C. after the boiling water treatment, so that the difference in the decomposed yarn length between the sheath yarn and the core yarn is 10% or more and 60% or more.
% Or less.

One of the major factors influencing the swelling of the fabric is the porosity of the yarn itself described above. The larger the porosity, the larger the swelling of the fabric tends to be. In order to increase the voids of the yarn itself, it is effective that the single yarns constituting the mixed yarn have a difference in length, so-called yarn length difference. After the heat treatment corresponding to the dry heat setting temperature at which the treatment is performed at the highest temperature in the process, it is preferable that the yarn length difference between the shortest single yarn group and the longest single yarn group of the mixed yarn is 10% or more. . However, on the other hand, if the yarn length difference is too large, the swelling will be passed and swelling will be felt. Therefore, it is preferably 60% or less.

The fineness of the mixed fiber of the present invention is not particularly limited as long as it is composed of polyester multifilaments. For example, a third component which can be dyed with a cationic dye is copolymerized. It may be a polymer obtained by blend spinning of the above components or a particle to which particles are added. Similarly, the cross section may be a hollow or triangular shaped cross section yarn.

Further, the polyester mixed fiber of the present invention has a degree of entanglement of 60 (pieces / m) or more, since the mixed fiber is not separated by ironing in a later step and does not adversely affect the high-order passing property.
It is preferable that the fibers are mixed and entangled in a range of 0 (pieces / m) or less.

If the degree of entanglement is less than 60 (pieces / m), the convergence of the mixed yarn is insufficient, and the process passability such as poor opening of the warp yarn during weaving is undesirably reduced. Meanwhile 17
If it exceeds 0 (pieces / m), the entanglement becomes too strong, the voids in the yarn decrease, and the desired sufficient swelling and softness cannot be achieved, which is not preferable.

If the sheath yarn is a highly oriented drawn yarn, it has a drawback that the slimy feeling becomes strong. However, this slimy feeling can be eliminated by the undrawn yarn, and can be changed to a dry touch. For such a dry touch, the average elongation at break is preferably 80% or more. However, when the average elongation at break exceeds 130%, a large amount of cracks are generated on the fiber surface in the alkali weight reduction step after weaving, and the strength cannot be maintained, which is not preferable.

Further, the shrinking yarn constituting the core yarn is preferably a polyester obtained by copolymerizing a third component having high shrinkage typified by isophthalic acid.

Since the third component is copolymerized, high shrinkage is obtained, and the yarn length difference between the core and the sheath becomes large, so that the space between the fibers increases, and a soft feeling and a swelling feeling are obtained. You can do it.

The core yarn is preferably a composite yarn in which two or more polymers having different shrinkage differences are formed in a side-by-side type. This is because, by the heat treatment, the mixed fiber develops self-crimp, so that in addition to the improvement of the swelling feeling, an appropriate stretch property can be imparted to the woven or knitted fabric.

Next, a method for producing the mixed fiber of the present invention will be described.

In the present invention, the yarn to be the sheath yarn a
And the birefringence (Δn) is 50 × 10 ^-380 × 10 or more^-3
Using the following highly oriented polyester unoriented yarn, the core yarn b
As a yarn that becomes
Using a polyester stretch yarn, these are both composite false twisted
It is to be processed.

The processing temperature at the time of false twisting is set lower than the glass transition temperature of the sheath yarn in order to prevent loss of spontaneous elongation due to rapid crystallization of the highly oriented undrawn yarn as the sheath yarn. And preferably at about room temperature.

By such false twist stretching, the sheath yarn is stretched more than the core yarn to provide a yarn length difference between the core and the sheath. It is important that the heat treatment is performed at 120 ° C. or higher. By this heat treatment, the sheath yarn of the false-oriented drawn high-oriented undrawn yarn is subjected to relaxation heat treatment for the difference in yarn length,
It will have spontaneous elongation. However, if the treatment temperature during the heat treatment is too high, rapid crystallization is promoted, and spontaneous elongation is lost, and fusion occurs, so the temperature is set to 200 ° C. or lower.

At the time of this heat treatment, it is preferable to set relaxation conditions in order to enhance the spontaneous elongation of the highly oriented undrawn yarn which becomes the sheath yarn. The overfeed rate of this relaxation is 0% or more and 15 for the yarn to pass stably.
%, More preferably 5% or less.

As a means for imparting entanglement to the yarn, a commonly used interlaced air-mixed nozzle is preferable.
Further, in the production method of the present invention, the yarn length difference between the core and the sheath becomes large, so that nep is easily generated and the process becomes unstable.

A description will be given of the appearance of tarmi and loops on the surface of the mixed fiber which is a feature of the mixed fiber form of the present invention. When the yarn temperature is lower than the glass transition temperature of the sheath yarn and the composite false twist drawing is performed, when the highly oriented undrawn yarn that becomes the sheath yarn is wound around the fully drawn yarn of the core yarn and drawn, The sheath yarn is not drawn uniformly, and the drawn state becomes uneven. For this reason, when the sheath yarn shrinks in the subsequent secondary heater, the shrinkage becomes uneven, and the single yarn of the sheath yarn that has not been absorbed by the mixed yarn becomes a tarmi or a loop.

At this time, if the sheath yarn is excessively supplied to the core yarn, the stretching of the sheath yarn becomes more uneven, so that the thickness and the loop can be increased. In order to obtain this effect, it is preferable that the oversupply be at least 2% or more. However, when weaving and knitting increase the amount of lumps and loops, the passability of the process is reduced.
It is preferable that the content be 5% or less.

[0045]

Next, the present invention will be described in detail with reference to examples and drawings, but the present invention is not limited thereto. Each physical property value described in the text and in the examples is based on the following measurement methods. (1) Talmi, number of loops and height of pile Cut the mixed fiber into an appropriate length, attach it to an appropriate board without applying tension, count the number per 10cm and 1cm
Convert to the number per hit. There are five test points, and the average is the measured value. The height of the mountain was determined by enlarging the yarn with a projection device. In addition, the diameter of the mixed fiber was measured from five places where no tarmi and loops appeared from the projection view, and the average value was obtained. (2) Stretch Elongation (CS) and Stretch Elastic Modulus (CD) JIS-L1090 According to the method of stretch A (details are as follows).
Treat at 0 (° C) for 10 minutes. After the sample was taken out and cooled, the upper end of the sample was fixed with a clamp, and 0.0018 (c
(N / dtex), and after 30 seconds, weigh 20 (cm) (LC1) correctly from the upper clamp and mark, and then apply a load of 0.0018 (cN / dtex). The length of the sample after 30 seconds (LC2) was measured, and after unloading, the sample was left to stand for 2 minutes, the initial load was applied again, and the length of the sample after 30 seconds (LC3) was measured. (%) And elastic modulus (%) are calculated. The number of tests is 20 times, and the average value is represented by one digit after the decimal point.

Expansion and contraction rate (%) = ｛(LC2-LC1)
/ LC1｝ × 100 Stretch elastic modulus (%) = ｛(LC2-LC3) / (LC2-
LC1)｝ × 100 If the sample is not long enough, the test length under initial load (LC1) is optional. (3) Dry heat shrinkage (ΔSW) Using a scale measuring machine with a frame circumference of 1.125 (m),
With an initial load of 018 (cN / dtex)
Make a skein with 10 turns, and 0.088 (cN / d
tex), and measure its length.
m). Next, the temperature of the dryer is set to 180 ° C., and the treatment is performed for 15 minutes while applying a load. The length L2 (mm) of the skein taken out of the dryer with a load applied
Is measured. The dry heat shrinkage is calculated by substituting the above L1 and L2 into the following equation. In addition, the average value of the number of times of measurement 5 is defined as the measured value.

ΔSW (%) = {(L1-L2) / L1} × 100 (4) Self-elongation rate (ΔSH) A load of 0.088 (cN / dtex) is applied to the sample, and its length L3 (mm) Is measured. Next, the load is removed, and the sample is put in a bath in a state of being wrapped in gauze or the like, and treated with boiling water at a normal pressure of 98 (° C.) for 10 minutes. After taking out the sample and allowing it to air dry, put it in a dryer and dry heat at 180 (° C) for 10 minutes.
Process for a minute. After cooling, the sample was again charged with 0.088 (cN / d
tex), and the length L4 (mm) is measured. The above L3 and L4 are substituted into the following equation to calculate a 180 (° C.) self-elongation rate (ΔSH). In addition, the average value of the number of times of measurement 5 is defined as the measured value.

ΔSH (%) = {(L4−L3) / L3} × 100 (5) Degree of Entanglement A yarn of an appropriate length is taken out and 0.088 (cN /
dtex) and suspend vertically. Then, a suitable needle is inserted into the yarn and slowly lifted, and the distance (cm) required to move until the load is lifted is measured 100 times, and an average value L (cm) is obtained from the measured value.

Degree of entanglement (pieces / m) = 100 / (2 × L) (6) Decomposition Yarn Length Difference Take out a yarn of an appropriate length and carefully divide it into single yarns so that the fibers themselves do not stretch. Decompose. The disassembled single yarn is placed on a scale plate coated with glycerin, and stretched to a degree that crimping and habit are eliminated, and the length L of one single yarn is measured (1).
mm unit). It is classified into a short single yarn group and a long single yarn group, and the average length of the short single yarn group is L1 and the long single yarn group is L2, and is calculated by the following equation. The average value of five measurements is used as the measured value.

Decomposition yarn yarn length difference (%) = ｛(L2-L1) /
L2｝ × 100 (7) Number of crimps
With an initial load of (cN / dtex) applied, three single yarns are stretched over a frame and projected on a screen by a projector, and the number of peaks and valleys between 1 cm is read and set to 1/2. The average value of five measurements is used as the measured value. (8) Average breaking elongation Measured by a tensile tester. The average value of five measurements is used as the measured value. (9) Birefringence (Δn) Determined by measuring the retardation and optical path length of a single yarn using a BH-2 deflection microscope manufactured by OLIMPUS.

Examples and comparative examples will be described below. Table 1 shows the processing conditions of each example, and Table 2 shows the physical properties of the original yarn and the obtained processed yarn. (Example 1) Polyethylene terephthalate was melt-spun as a sheath yarn at a spinning speed of 3700 m / min to obtain a birefringence (△).
A highly oriented undrawn yarn 1 having 48 filaments of 111 dtex and n) of 62 × 10 ⁻³ was obtained. On the other hand, a total of 87 mol% of isophthalic acid and 5 mol% of 2-2 bis [4- (2-hydroxyethoxy) phenyl] propane were used as the core yarn, for a total of 87 mol%.
Using a polyester component obtained by copolymerizing mol% of ethylene glycol and terephthalic acid, a highly shrinkable fully drawn yarn 2 having 83 decitex 12 filaments was obtained by a melt spinning method and a conventionally known drawing method. These highly oriented undrawn yarns and fully drawn yarns are combined with a first roller 3 and a second
After the sheath yarn is divided and supplied between the roller 4 and the core yarn so as to be oversupplied at a rate of 10% with respect to the core yarn, the sheath yarn is applied by a triaxial friction twister 7 on the unheated primary heater 6. After the false twist stretching while twisting, a relaxation heat treatment is performed by a secondary heater 9 provided between the third roller 5 and the fourth roller 8. Next, the fiber is mixed between the fourth roller 8 and the fifth roller 10 by the interlace air nozzle 11 and wound around the winder 12.

As shown in FIG. 2, the three-dimensional crimp was not generated in the sheath yarn before heat treatment, but about 1/3 to about 1 of the mixed fiber diameter was obtained. 1.3 times as many tarmi and loops / cm were expressed. The degree of entanglement of this mixed fiber is 108 (pieces / m), and the average breaking elongation of the sheath yarn is 11
1%. Next, the mixed fiber was decomposed into a core component and a sheath component, and subjected to dry heat treatment at 180 ° C., respectively. As a result, the sheath component exhibited -1.5% shrinkage, and the stretching and elongation rate was 5.2.
%, The elastic modulus of elasticity is 78.5%, and the core component is 28.6.
% Shrinkage.

When the mixed fiber is subjected to a boiling water treatment and subsequently to a dry heat treatment, a three-dimensional crimp is developed on the sheath yarn as shown in FIG. A reduced number was expressed. Further, when the yarn length difference was measured after being decomposed into a core component and a sheath component, it was 25.0%. After applying 800 (T / m) twisting yarn to the obtained mixed fiber by a usual method, twist setting is performed at 60 ° C. for 30 minutes using a steam setter.
A twill fabric was woven using the warp and weft. There was no particular problem in the warp yarn opening property during weaving, and the weaving property was good.

After the woven fabric is relaxed and scoured,
Set at 80 ° C, apply 17% alkali weight loss processing,
After dyeing with a disperse dye using a jet dyeing machine,
Final set at ℃. The obtained woven fabric had moderate swelling and tightness, and particularly had a delicate surface touch and a texture excellent in resilience. When the surface of the woven fabric was observed using a scanning electron microscope, it was confirmed that the yarns constituting the woven fabric surface exhibited fine crimps. (Example 2) The same raw yarn as that used in Example 1 was used as the sheath yarn, and as the core yarn, polyethylene terephthalate was added with 50 /
Using a composite spun polyethylene terephthalate 56 decitex 12 filament bonded in a side-by-side type at 50, a mixed fiber was obtained under the processing conditions of the process of FIG. On the surface of the obtained mixed fiber, about 1/3 to 0.8 times the diameter of the mixed fiber was found to have 1.5 pieces / cm of tarmi or loop, and the entanglement degree was 115 (pieces / m2). )Met. The average breaking elongation of the sheath yarn was 108%. Next, the mixed fiber was decomposed into a core component and a sheath component, and subjected to dry heat treatment at 180 ° C., respectively. As a result, the sheath component exhibited -1.6% shrinkage, and the elongation and contraction rate was 7.0. %, The elastic modulus of elasticity was 81.2%, and the core component showed shrinkage of 27.2%. After the mixed fiber was subjected to boiling water treatment and subsequently to dry heat treatment, the yarn was divided into a core component and a sheath component, and the difference in yarn length was measured. The result was 25.0%. Further, a crimp of 5.2 (crests / cm) was developed in the core yarn.

After twisting the yarn at 800 (T / m) by a conventional method, the yarn is heated at 60 ° C. and 30 ° C. using a steam setter.
Twisting was set for one minute and used for warp and weft yarns, and a twill fabric was woven. There was no particular problem in the warp yarn opening property during weaving, and the weaving property was good.

After the woven fabric is relaxed and scoured,
Set at 80 ° C, apply 17% alkali weight loss processing,
After dyeing with a disperse dye using a jet dyeing machine,
Final set at ℃. The resulting fabric had moderate swelling and tightness. In addition, the core yarn had a large stretch property which is considered to be caused by the side-by-side type composite yarn. Further, as in Example 1, it has a delicate surface touch and a texture with excellent resilience. When the surface of this woven fabric was observed using a scanning electron microscope, the yarns constituting the woven fabric surface were fine. It was confirmed that a high crimp was developed. (Comparative Example 1) Using the same raw yarn as in Example 1, in the step of FIG. 1, the first heater temperature 6 was heated to 180 ° C. to perform false twist stretching. After the obtained mixed fiber was subjected to boiling water treatment and subsequently to dry heat treatment, it was decomposed into a core component and a sheath component, and the yarn length difference was measured. As a result, the shrinkage of the sheath yarn was 2.6% and self-elongation was exhibited. Did not.

After the fabric obtained by twisting and weaving in the same manner as in Example 1 was relaxed and scoured, it was set at 180 ° C., subjected to a 17% alkali weight reduction treatment, and subsequently dispersed with a jet dyeing machine. And then final set at 160 ° C. The obtained woven fabric was inflated and inferior in tension to those of the examples. (Comparative Example 2) Polyethylene terephthalate was melt-spun as a sheath yarn at a spinning speed of 3000 m / min to obtain a birefringence (△).
A 133 decitex 48 filament having n) of 35 × 10 ⁻³ was obtained. This yarn was stretched at 1.60 times without heat treatment, and then subjected to a 20% relaxation heat treatment at 180 ° C., then mixed with the same yarn as the core yarn of Example 1 by an interlace air nozzle, and wound around a winder. There were no tarmi or loops on the surface of the obtained mixed fiber. Further, even when subjected to the boiling water treatment and subsequently to the dry heat treatment, neither the core yarn nor the sheath yarn exhibited three-dimensional crimping. (Comparative Example 3) The same sheath yarn as that of Comparative Example 2 was used as the sheath yarn, and the same core yarn as that of Example 1 was used as the core yarn. Heat-treating without applying false twisting. Then, after a relaxation heat treatment of 5% was performed at a yarn temperature of 180 ° C., the film was wound around a winder. No tarmi or loops were found on the surface of the obtained mixed fiber.

[0058]

[Table 1]

[0059]

[Table 2]

[0060]

The polyester mixed yarn of the present invention is formed into a woven or knitted fabric and then subjected to a usual dyeing step, so that the sheath yarn becomes 3 yarns.
Dimensional crimping and self-elongation that is not uniform at the same time, and at the same time crimping of the core yarn, even if high shrinkage is developed, the core hardness does not remain in the woven or knitted fabric and sufficient swelling A wonderful texture that combines softness and softness can be obtained without deteriorating weaving or knitting.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing an example of a method for producing a polyester mixed fiber according to the present invention.

FIG. 2 is a schematic side view showing an example of the polyester mixed fiber yarn according to the present invention.

FIG. 3 is a drawing of a polyester mixed fiber according to the present invention, which is treated with boiling water;
It is a side schematic diagram which shows an example of the mixed fiber which performed the dry heat treatment subsequently.

[Explanation of symbols]

 1: Highly oriented polyester unstretched yarn 2: Polyester stretched yarn 3: First roller 4: Second roller 5: Third roller 6: Primary heater 7: Triaxial friction twister 8: Fourth roller 9: Secondary heater 10 : Fifth roller 11: Interlace air nozzle 12: Winder

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L036 MA17 MA26 PA05 PA10 PA18 PA20 PA33 PA42 RA03 RA04 RA05 UA01 UA30

Claims (7)

[Claims] (1) The sheath yarn a has a stretch elongation (CS) of 2 when subjected to a dry heat treatment at 130 ° C. or higher or a heat treatment equivalent thereto.
% And 10% or less and a three-dimensional crimp having a stretch modulus (CD) of 60% or more, and at the same time, 0% in the yarn axis direction.
The core yarn b is made of a multifilament yarn having a self-extensibility of at least 10% or less, and the core yarn b shows a shrinkage of 10% or more by a dry heat treatment at 130 ° C. or more or a heat treatment equivalent thereto, and 2 (peaks / cm) or more. (Crests / cm) A polyester multifilament yarn containing a copolymer component exhibiting a high shrinkage exhibiting a crimp of not more than 1/3 of the diameter of the mixed fiber and not more than 1 times the diameter of the mixed fiber. /
Or loop more than 0.5 (pieces / cm) and 5 (pieces / cm)
A polyester mixed fiber comprising: Where CS (%) = {(LC2-LC1) / LC1} ×
100 CD (%) = ｛(LC2-LC3) / (LC2-LC
1)｝ × 100 Here, LC1: 0.0018 cN after dry heat treatment at 180 ° C.
/ Dtex Length under load (mm) LC2: 0.088cN / dtex after 180 ° C dry heat treatment
Length under load (mm) LC3: 0.0018 cN / dtex again after LC2 measurement
Length under load (mm) 2. After the whole mixed fiber has been subjected to boiling water shrinkage treatment,
2. The polyester mixed fiber yarn according to claim 1, wherein a difference in length of the decomposed yarn between the sheath yarn a and the core yarn b after the dry heat shrinkage treatment at 80 ° C is 10% or more and 60% or less. . 3. The sheath yarn a and the core yarn b are entangled at a degree of entanglement of 60 / piece.
The polyester mixed fiber yarn according to claim 1 or 2, wherein the mixed fiber is mixed with an entanglement in a range from m) to 170 (pieces / m). 4. An average elongation at break of the sheath yarn a of 80% or more.
4. The method according to claim 1, wherein the amount is 30% or less.
The polyester mixed fiber according to any one of the above. 5. A side-by-side composite yarn comprising at least a part of said core yarn b comprising a polymer comprising a copolymer component having high shrinkage.
The polyester blended yarn according to claim 4. 6. The birefringence (Δn) for forming the sheath yarn a is 50 × 1.
0 and polyester highly oriented undrawn yarn is ^-3 80 × 10 ^-3 or less, and a polyester drawn yarn containing copolymerizable component showing a high shrinkage of the core yarn b, the glass transition point of room temperature or more sheath yarn a After the composite false twisting is performed at the following yarn temperature, 0% is applied under the temperature condition where the yarn temperature becomes 120 ° C. or more and 200 ° C. or less.
A method for producing a polyester mixed fiber, wherein a entanglement treatment is performed after performing a relaxation heat treatment at 15% or less. 7. The polyester mixed fiber yarn according to claim 6, wherein the sheath yarn a is oversupplied in a range of 2% to 15% with respect to the core yarn b during the composite false twisting. Method.