JPH1072735A - Combined false twisted yarn having improved heat shrinkage characteristic, its production and middle worsted yarn-like woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conjugate false twisted yarn capable of forming and increasing a bent crimp structure having a large texture of woven fabric by heat treatment of a woven fabric finishing process and of retaining high bulkiness even if subjected to compression finishing, as calender processing and to provide a method for producing the conjugate false twisted yarn. SOLUTION: Two or more polyester multifilament yarns different in elongation are doubled and false twisted to give a conjugate false twisted yarn comprising a core yarn and a side yarn. The core yarn is a highly shrinkable polyester yarn copolymerized with 5-18mol% of a copolymerization component, the difference in length between the core yarn and the side yarn is 10-45%, the percentage crimp is 0.1 to <15% and the heat shrinkage percentage (boiling water shrinkage percentage + 180 deg.C dry heat shrinkage percentage) is 10-75%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false twist yarn having improved heat shrinkage characteristics and a method for producing the same, and more particularly, to obtaining a shrink milled fabric, a high bulk and light weight fabric, a nubuck fabric and the like. The present invention relates to a composite false twist yarn having improved heat shrinkage properties and a method for producing the same.

[0002]

2. Description of the Related Art Composite false twisted yarns are widely used as processed yarns that can express the feeling and appearance of spun yarns, even though they are long fibers. A typical composite false twist yarn is obtained by combining two or more types of polyester multifilament yarns having a difference in elongation and subjecting them to composite false twisting. The processed yarn is characterized by a two-layer structure consisting of a core yarn and a sheath yarn, a bulky structure due to the difference in yarn length between the core sheath yarn, and a structure in which the sheath yarn is wound alternately around the core yarn. Because it can express the texture and appearance of wool worsted fabric, it is widely used for outerwear for men and women. Such a composite false twist yarn is disclosed in, for example, JP-A-54-101946.

[0003] Also, a similar composite false twisted yarn having a core-sheath two-layer structure having a difference in yarn foot and a high crimp rate has been proposed as a material in the field of wool.

[0004] In the processing of the composite false twist yarn described above, a low false twist temperature and a low false twist number can be obtained. Has been proposed as a processed yarn capable of expressing the feeling and appearance of silk spinning. Such a composite yarn is disclosed, for example, in Japanese Patent Publication No. 7-68655.

Further, in the composite false twisting process, a so-called outdraw composite false twisting process is performed by using a drawn yarn of a polyester filament containing a copolymer component on the low elongation side yarn to form a silk false twist. It has been proposed as a yarn that can express a wool-like feel and appearance. This composite false twist yarn is characterized by an intermediate level of crimping ratio, yarn foot difference, and high heat shrinkage ratio between the purpose of worsting and the purpose of silk. Such a composite yarn is disclosed, for example, in JP-A-6-57564.

[0006] As described above, the composite false twisted yarn can change the bulkiness of the yarn from a high bulkiness aimed at worsting to a low bulkiness aimed at silk spinning. Expression of silky drape was made possible.

[0007] However, these composite false twisted yarns include:
When the warp / weft forming the fabric is subjected to the fabric dyeing finishing treatment, there is no characteristic that can cause a large structure bending structure, and therefore, the worsted with a shrink-milled tone-like ground tightness which is the object of the present invention. It has been difficult to express a woven fabric, a full-fledged woven fabric having a high bulk and lightness, and a nubuck-like fabric as if it were made by impregnating a short fiber nonwoven fabric with a urethane resin.

[0008] The wool crimped milled woven fabric which is the object of the present invention is subjected to steam in the fabric finishing step to shrink in the warp and weft directions to generate a large bent crimp structure in the warp and weft constituting the fabric structure. Further, the fabric is compressed in the thickness direction of the woven fabric using an electric press or a calender roll to create a feeling.

[0009] The woven fabric has a characteristic that it has a feeling of ground tightness and also has a bulky property that is soft in compression deformation and shows elasticity. Therefore, based on the idea that if the composite false-twisted yarn has a high crimp rate and a high heat shrinkage rate, it will be possible to obtain a shrink-milled fabric, I made a model yarn ignoring the functionality and examined the fabric.

[0010] As a result, the warp / weft becomes bulky due to the high crimp ratio, and the woven fabric shrinks in the warp / weft direction, but the warp / weft bent crimp structure of the woven fabric structure is close to the straightness of the greige machine. Did not provide a large bent structure with only a slight increase in bending. Therefore, although the feeling was bulky, it was a feeling with a core and far from the shrink feeling.

[0011]

DISCLOSURE OF THE INVENTION The present invention is capable of producing and increasing a large crimped structure of a fabric structure by a heat treatment in a fabric finishing step, and has a high bulkiness even when subjected to a compression finish such as calendering. And a method for producing the same.

[0012]

The object of the present invention cannot be solved by making a composite false twisted yarn having both a high crimping rate and a high heat shrinkage rate, as described above with reference to an example of a model experiment. The present inventors have investigated and analyzed this phenomenon, and found that a yarn having a high crimping rate causes heat-induced crimping while causing crimping, resulting in bulkiness. Even if the tissue friction is increased and the heat shrinkage ratio is high, the heat shrinkage does not cause crimping of the tissue, but merely causes fiber shrinkage to make the tissue compact. I found that I was.

[0013] This led to the idea that the crimp rate of the composite false twist yarn had to be low even though the fabric required high bulkiness. In addition, we considered that the role of the initiator, which creates the trigger for increasing the occurrence of the tissue bending crimp by the heat treatment, could be played with a high heat shrinkage rate. Then, the technical idea that high bulkiness is created by the difference in the yarn length and the difference in heat shrinkage between the core yarn and the sheath yarn has been established. The present invention embodying such a technical idea is as follows.

(1) A composite false twisted yarn composed of a core yarn and side yarn obtained by combining and multiplying two or more kinds of polyester multifilament yarns having a difference in elongation, wherein the core yarn is copolymerized. Highly shrinkable polyester yarn obtained by copolymerizing the components in an amount of 5 to 18 mol%, and a difference in yarn length between the core yarn and the side yarn is 10% to 45%.
, The crimp rate is in the range of 0.1% to less than 15%, and the heat shrinkage rate of the entire false twisted yarn (boiling water shrinkage rate + 180 ° C. dry heat shrinkage rate)
(2) a polyester multifilament yarn having a difference in elongation of at least two kinds, wherein the polyester multifilament yarn has an improved heat shrinkage property.
In the method for producing a composite false-twist yarn which is subjected to false twisting, a high-shrinkable polyester yarn which can be drawn and has a copolymerization component of 5 to 18 mol% is used as the low-elongation filament yarn. As a filament yarn on the side, a polyester false yarn having an elongation difference of 80% or more from the low-elongation filament yarn is stretched and false-twisted. (3) A composite false twisted yarn comprising a core yarn and side yarns obtained by laying two or more kinds of polyester multifilament yarns having a difference in elongation and performing false twisting, wherein the core yarn is 5 polymerization components
A high-shrinkage polyester yarn copolymerized with a core yarn and a side yarn in a range of 10% to 45%, and a crimp ratio in a range of 0.1% to less than 15%. The heat shrinkage rate (boiling water shrinkage rate + 180 ° C. dry heat shrinkage rate) of the entire false twist yarn is 10% to
A milled worsted fabric comprising a composite false twist yarn in the range of 35% for warp and / or weft yarns. Hereinafter, the composite false twisted yarn with improved heat shrinkage properties and the method for producing the same according to the present invention will be described in more detail.

The composite false twist yarn of the present invention is a composite false twist yarn comprising a core yarn and side yarn obtained by combining and twisting two or more kinds of polyester multifilament yarns having a difference in elongation. The crimp rate of the composite false twisted yarn of the present invention must be low crimp because of the necessity of generating a large tissue bending crimp in the finishing process of the fabric, even though the target fabric requires high bulkiness. Must.

The crimp rate of the composite false twist yarn of the present invention is less than 15%. In a conventional composite false twist yarn, 4% or less for silk spinning tone, 15 to 23% for silk wool tone, and 28% for worsted tone.
%, And the crimping ratio is 3 even with 2-feed Taslan yarn of false twisted wooly yarn aiming at the spun like feeling.
It is around 0%. Compared with these conventional processed yarns, the composite false twisted yarn of the present invention needs to have a low crimp ratio of less than 15% in the worsted woven fabric, in spite of particularly aiming for high bulkiness.

When the crimp ratio is higher than 15%, the woven or knitted fabric is shrunk by high crimp simultaneously with heat shrinkage, so that the occurrence of crimping of the woven fabric structure is inhibited, and the obtained fabric is easily stretched. However, it is not suitable for a worsted-like fabric having a sense of ground tightness or a high-bulk, high-weight fabric having a stiffness. This crimp rate is 10%
The following is more preferred. The high bulkiness of the composite false-twisted yarn of the present invention is based on the difference in yarn length between the core yarn and the side yarn and the high heat shrinkage difference developed in a later step, as described later, and the fiber obtained by crimping the sheath yarn. Because it is formed by adding turbulence, it is not necessary to have bulkiness due to the crimping rate, as in conventional composite false twisting yarns, in which crimps are developed by heat treatment and the yarn length apparently shortens and the yarn swells. Is good. Although it may be about 0.1%, it is preferable to attach a crimp crimp so that the constituent filaments may be disturbed in the finishing step in order to express a spanned feel and appearance,
In that sense, 4% to 8% is preferable.

The heat shrinkage of the composite false twisted yarn of the present invention is high, because the heat treatment in the fabric finishing step acts as an initiator for generating a trigger for generating a large tissue bending crimp structure and an effect for increasing the crimp. Need a rate.

The heat shrinkage rate (boiling water shrinkage rate + 180 ° C. dry heat shrinkage rate) must be 10% or more. If it is less than 10%, a large texture crimp cannot be formed. Preferably, 15% or more is required. On the other hand, the higher the heat shrinkage, the better, but 35% is sufficient to achieve the object of the present invention.
Range. When it exceeds 35%, when worn as a woven fabric, wearing fatigue such as knees and elbows may occur.

The need for such a high heat shrinkage,
Its heat shrinkage behavior is shrunk by boiling water treatment,
It is necessary for shrinkage to increase when subjected to
For example, if the film shrinks significantly in the boiling water treatment but self-stretches in the dry heat treatment at 180 ° C., it is not possible to obtain a large tissue bending crimp and a feeling of ground tightness, which are the objects of the present invention.

For this reason, the core yarn of the composite false twist yarn of the present invention must be a copolymerized polyester obtained by copolymerizing a copolymer component with 5 to 18 mol%. As this copolymer component,
At least one selected from the group consisting of dicarboxylic acids, diols and bisphenols is used. Other copolymer components have problems such as high polymer cost, poor spinning properties, and the inability to obtain the desired heat shrinkability.

Here, the dicarboxylic acid is a dicarboxylic acid other than terephthalic acid, such as sebacic acid, phthalic acid and isophthalic acid. The diol is diethylene glycol, butylene glycol, propylene glycol or the like. Bisphenol is bisphenol A, bisphenol sulfone or an ethylene oxide adduct thereof.

The copolymerization amount is 5 to 5 based on terephthalic acid.
The range is 18 mol%. If it is less than 5 mol%, the necessary heat shrinkage cannot be obtained, and if it exceeds 18 mol%, the false twisting processability deteriorates due to the melting point drop, and the shrinkage is not completed in the dyeing and finishing step, resulting in poor dimensional stability of the product. Cause such problems.

Among the above copolymer components, isophthalic acid is the easiest to use from the viewpoint of polymer cost, spinnability, yarn workability and product quality. When a polyester fiber obtained by copolymerizing bisphenol A or an ethylene oxide adduct thereof as a diol component is used, there is a characteristic that the shrinkage force is high even under the restraining force of the fabric structure. However, this type of fiber may have a problem of light fastness, and in the case of a composite false twisted yarn in which bisphenol A copolymer yarn appears on the surface of a woven fabric, the content needs to be 4.8 mol% or less. In the composite false twisted yarn of the present invention, since it is hidden inside the woven fabric, there is no problem up to more than 4.8 mol% and up to 7 mol%.

When bisphenol A is 4.8 mol% or less or 7 mol% or less, isophthalic acid is copolymerized as the fourth component, and the total copolymerization amount is 18 mol%.
The shrinkage can be increased by the following.

Since the composite false twist yarn described above is used, the difference in yarn length between the core yarn and the side yarn is required to be 10% or more, and more preferably 20% or more, in order to impart high bulkiness to the woven fabric. 1
If it is less than 0%, the desired bulkiness cannot be obtained even if the heat shrinkage is high. The yarn length difference is preferably as large as possible, but is mainly determined by the elongation difference of the original yarn and the deformation of the stretch false twist.

The yarn structure of the composite false twist yarn of the present invention may be a structure in which side yarns are wound alternately around a core yarn, a structure in which side yarns are wrapped around a core yarn, or a mixed structure thereof. Good.

In order to heat-treat the greige fabric to generate and increase the crimping of the texture bending, it is preferable that the core yarn and the side yarn of the composite false twisted yarn behave integrally so as to cause bending. It is good to give a confound between a core thread and a side thread, or to give a twist thread. Further, when subjected to heat treatment by entanglement or twisting, the side yarn covers the core yarn, and the problem of light fastness of the core yarn can be prevented. The confounding may be so-called interlaced confounding or Taslan confounding with fine loops.

In the case of twisting, for example, in a worsted mill-like woven fabric, the twist coefficient is preferably in the range of 3,000 to 13,500. Here, the twist coefficient (α) = √De × T, where De is the fineness (denier) of the composite false twisted yarn, and T is the number of twists (T / m).

The side yarns of the composite false twisted yarn of the present invention may also include various value-added polyesters in order to further increase the added value of the product by adding the feeling, appearance, and function to the woven or knitted product in addition to the effects of the present invention. Filament yarns can be used. Normally, polyester filament yarn made of polyethylene terephthalate is used, but single fiber fineness is changed from thick denier to microfiber in order to make the feel rough and soft, and titanium oxide and barium sulfate are used to change gloss and dry touch feeling. Particles can be added.

Thick-and-thin yarns can be used to give a thick feeling, a marbled appearance, and a scuffed appearance. In order to express the nubuck feeling, various types of split ultrafine composite fibers can be used.

In order to impart a refreshing feeling and a dry feeling to the woven or knitted fabric, fine fiber holes are formed on the fiber surface by using a polyester yarn in which an incompatible organic substance is dispersed in fine particles by reducing the alkali in a later step. Can also. Next, a method for producing the composite false twist yarn of the present invention will be described.

First, a method of producing a composite false twisted yarn in which two or more kinds of polyester multifilament yarns having a difference in elongation are combined and false-twisted is adopted. A copolymerized polyester yarn obtained by copolymerizing a polymerization component with 5 to 18 mol% is used. This is for obtaining a high heat shrinkage as described above, and the above-mentioned copolymer component is used.

When the polyester of the core yarn is polyethylene terephthalate, as in the case of the conventional composite false twisted yarn, if the false twisting temperature exceeds 130 ° C., crystallization is promoted, the specific gravity increases, and the boiling water shrinkage ratio becomes 3.5%. It will be low. Therefore, composite false twisted yarn woven fabric has less shrinkage width in the dyeing finishing process,
Although it is devised to relax with a high pressure relaxer,
It is not possible to obtain the shrinkage characteristics intended for the present invention.

On the other hand, when processing is performed at a false twist temperature of 120 ° C. or less, crystallization is suppressed, specific gravity is low, and boiling water shrinkage is 8.
About 5% of the processed yarn can be obtained. However, such heat shrinkage due to low-temperature false twisting and low crystallinity causes shrinkage at about 80 ° C., which is the glass transition point. The application of heat at 0 ° C. results in a loss of most of the heat shrinkage and does not contribute to the formation of crimped tissue in the fabric.
Even if it is used without twist, it shrinks in the pre-dyeing process such as the scouring process, so it may not shrink in the process after scouring or may slightly elongate, and the fabric structure will loosen and drape properties will appear, so silky fabrics Although suitable, it does not provide the desired effect of the present invention.

In the present invention, since the copolyester is used for the core yarn, it shrinks in the twist setting in the fabric preparation step, in the dyeing finishing step, and in the heat setting step after dyeing.

The filament yarn on the low elongation side must be a drawable raw yarn. When the composite false twist is performed using the drawn filament yarn, the crimp rate of the composite false twist yarn increases, and the drawing distortion is reduced by the heating of the false twist processing, so that a high heat shrinkage rate is maintained. Difficult to do. By performing draw composite false twist using a drawable raw yarn, processing can be performed while generating fiber internal strain due to drawing, so even if a part of the yarn is relaxed by false twist heating, processing is performed using the drawn raw yarn. It is possible to obtain a higher shrinkage ratio than in the case where However, on the other hand, it is difficult to obtain a high crimp rate, but since the composite false twist yarn of the present invention aims at low crimp and high heat shrinkage rate,
It is rather convenient. That is, in the method for producing a composite false twist yarn of the present invention, a so-called outdraw false twist, in which overdrawing is performed using a drawn yarn on the low elongation side yarn, is inappropriate, and the low elongation side yarn is not suitable. Indo-row false twisting, in which false twisting is performed while stretching using an undrawn yarn or a halfway drawn yarn that can be stretched in advance, is suitable.

At this time, the higher the draw ratio of the raw yarn, the larger the drawing strain, and the higher the heat shrinkage. Therefore, as the filament yarn on the low elongation side, an original yarn that can be drawn at least 1.1 times or more, preferably 1.2 times or more, and most preferably 1.4 times or more is used.

On the other hand, if the elongation of the yarn on the low elongation side becomes too large, the elongation of the yarn on the high elongation side of the mating yarn to be subjected to composite false twisting must be increased accordingly. In some cases, the drawability of the undrawn yarn may be poor, or the problem of fusing during false twisting may occur. Therefore, the yarn on the low elongation side has a draw ratio of 2 times or less, preferably 1.8 times or less. The yarn which can be false-twisted at a draw ratio of is preferred.

The draw ratio of the composite false twist may be at least 65% of the cut elongation of the filament yarn on the low elongation side. It is preferably set to 70 to 80% of the degree.

The difference in elongation between the filament yarn on the high elongation side and the filament yarn on the low elongation side must be 80% or more. Since the composite false twist yarn of the present invention obtains bulkiness not by bulkiness due to crimping but by difference in yarn length between core yarn and side yarn and difference in heat shrinkage, the difference in elongation is preferably large. When the difference in elongation becomes large, the filament yarn having a large elongation is drawn by the drawing and twisting of the composite false twist, and a large yarn length difference can be obtained. Therefore, the elongation difference is preferably 150% or more.

On the other hand, the upper limit of the elongation of the yarn on the high elongation side is restricted by the above-mentioned reason.
60% or less, preferably 330% or less provides better yarn workability.

Next, the false twist temperature will be described. The lower the temperature, the larger the stretching strain generated during the composite stretch false twist and the higher the heat shrinkability can be obtained. The higher the temperature, the greater the difference in yarn length between the core yarn and the side yarn, and the higher the temperature, the more the crimping of the side yarn and its turbulence.

Therefore, according to the method for producing a composite false twisted yarn of the present invention, a characteristic false twisted yarn is obtained by using the thermal deformation behavior of the polyester fiber microstructure and dividing it into the following three temperature ranges. Can be.

No. 1 is a composite false twist having a false twist temperature (T) of 80 ° C. <T, which has a small difference in yarn length but a heat shrinkage of 30%.
%, And shrinks by 30% or more by boiling water treatment.
By utilizing this, it is possible to produce a nubuck-like fabric by shrinking the warp of the woven fabric so that it cannot be distinguished.

Second, the false twist temperature (T) is 80 ° C. ≦ T ≦
A composite false twist having a temperature of 130 ° C. and a moderate difference in yarn length, but a processed yarn exhibiting high heat shrinkage at both boiling water and 180 ° C. can be obtained. By utilizing this, a high-bulk high-lightweight woven fabric having a large sum of a yarn length difference generated by false twisting and a yarn length difference generated by heat shrinkage can be produced.

The third is that the false twist temperature (T) is 130 ° C. <T
≦ 200 ° C., with a large difference in yarn length,
The heat shrinkage is several percent or more in boiling water, but further shrinks by 13% or more when a dry heat treatment at 180 ° C. is further applied.
When this is used, a varnished worsted tone fabric can be obtained by passing through a free setting process after dyeing.

The number of false twists is preferably large in order to generate a large yarn length difference, and the false twist coefficient (α) is preferably α> 0.8. This α is α = T × √D / 32,500 when the number of false twists is K (times / m) and the fineness of the processed yarn is D (denier).
Is the value represented by

In the composite false twist of the present invention, it is preferable to impart confounding before and / or after false twist in order to promote the occurrence of crimping of the tissue in the fabric finishing step. As the entanglement means, a method of air entanglement using an interlace nozzle or a Taslan nozzle is suitable.

Among them, it is necessary to reduce the crimp of the composite false twist yarn and to suppress the crimp floating of the side yarn filament on the surface of the composite yarn so as to obtain a yarn which is liable to cause a tissue bending crimp. Interlacing is preferred, and the nozzle is preferably an interlacing nozzle.

The heat shrinkage ratio as referred to in the present invention is as follows.
It refers to the total heat shrinkage when subjected to dry heat treatment for 0 minutes.

The crimp ratio was 3% in boiling water under a load of 2 mg / de.
It refers to the rate of crimping and shrinking when treated for 0 minutes.

The yarn length difference is measured by measuring the length of each fiber constituting a 5 cm long processed yarn, and taking the frequency distribution thereof, and expressing it by the ratio of the length of the shorter peak to the length of the longer peak.

In order to obtain a worsted milled woven fabric using the composite false twist yarn of the present invention, the warp yarn has a twist coefficient (α) = 3,000.
It is preferable to apply a twist yarn in the range of 13,500 to finish the woven fabric so that the cover factor of the woven fabric satisfies 2,500 ≦ CF ≦ 3,300. Here, CF is a cover factor, and is represented by CF = √D ₁ × N ₁ + √D ₂ × N ₂ ,
D ₁ fineness of the warp (denier), N ₁ is the warp density (the /
Inches), D ₂ is the fineness of the weft yarn (denier), N ₂ is the weft density (lines / inch).

[0055]

【Example】

[Example 1] A high-density undrawn yarn having 115 denier, 36 filaments and an elongation of 123% spun at 3,200 m / min from a polyester obtained by copolymerizing a polyester obtained by copolymerizing a bisphenol A ethylene oxide addition polymer as a 10 mol% copolymer component, 128 denier 48 obtained by spinning polyester made of polyethylene terephthalate at 1,400 m / min.
The filaments are untwisted using an unstretched yarn having an elongation of 301%, and then mixed and entangled at an overfeed ratio of 1.5% with a pneumatic pressure of 2 kg / cm ² using an interlace nozzle. Magnification 1.6 times, ratio of peripheral speed of false twist friction disk to yarn speed 2.1, processing speed 3
Stretch false twisting was performed at 00 m / min.

The obtained composite false twisted yarn had a structure in which side yarns were wrapped around a core yarn, and had a fineness of 154 de84fils, a heat shrinkage of 21%, a crimping ratio of 2.6%, and a yarn length difference of 28%.

Using the obtained composite false twisted yarn, 820 T /
m, and woven at a warp density of 100 yarns / inch and a weft density of 63 yarns / inch, relaxed at 120 ° C, set at 170 ° C, and used for warp yarns.
% Alkali was reduced, dyed at 130 ° C, and free-set at 180 ° C to finish.

The obtained woven fabric was a millworsted-like woven fabric having a large tissue bending crimp, a feeling of ground tightness and elasticity of compressive deformation. There was no problem with light fastness because the core yarn was covered with the side yarn.

Example 2 6 mol% of bisphenol A,
12 filaments of 115 denier spun spun copolyester obtained by copolymerizing 4 mol% of isophthalic acid as a copolymer component, 48 filaments of 150 denier spun spun highly oriented unstretched yarn of 130% elongation and polyethylene terephthalate, 330% elongation Using an unstretched yarn, combining and using an interlace nozzle, an overfeed rate of 1.5%,
After mixed and entangled at a compressed air pressure of 2 kg / cm ² , the heater temperature is 150 ° C., the draw ratio is 1.7 times, the ratio of the peripheral speed of the false twist friction disk to the yarn speed is 2.0, and the processing speed is 300 m / m.
The film was stretched and false-twisted in.

The obtained composite false twist yarn has a structure in which side yarns are alternately twisted around a core yarn, and has a fineness of 158 de-60.
films, heat shrinkage 22%, crimp rate 7%, yarn foot difference 32%
Met.

Using the obtained composite false twisted yarn, 800 T /
m, and weaving at a warp density of 100 yarns / inch and a weft density of 63 yarns / inch,
Relaxed at 120 ° C, set at 170 ° C, reduced by 17% alkali, dyed at 130 ° C, and free-set at 180 to finish.

The obtained woven fabric was a millworsted-like woven fabric having a large tissue bending crimp, a feeling of ground tightness and a single fiber crimp floating microscopically on the surface, and had no problem with light fastness.

[0063]

According to the composite false twisted yarn of the present invention, a large crimped structure of the fabric structure can be generated and increased by the heat treatment in the fabric finishing step, and it is high even when subjected to compression finishing such as calendering. Bulkiness can be maintained, and a shrink milled fabric, a bulky and lightweight fabric, a nubuck-like fabric, and the like, which cannot be obtained with a conventional composite false twist yarn, can be obtained.

Continued on the front page (72) Inventor Kimihiro Ogawa 3-4-1 Amihara, Ibaraki-shi, Osaka Teijin Limited Inside Osaka Research Center, Ltd. (72) Inventor Mitsuo Matsumoto 3-4-1, Aimihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center

Claims (6)

[Claims] 1. A composite false twist yarn comprising a core yarn and a side yarn obtained by combining and twisting two or more types of polyester multifilament yarns having a difference in elongation, wherein the core yarn is a copolymer component. Is a highly shrinkable polyester yarn obtained by copolymerizing 5 to 18 mol% with a yarn length difference between the core yarn and the side yarn of 10% to 45%, and a crimp ratio of 0.1% to less than 15%. The heat shrinkage (boiling water shrinkage + 180 ° C. dry heat shrinkage) of the entire false twist yarn is 1
A composite false twist yarn having improved heat shrinkage characteristics, which is in the range of 0% to 35%. 2. The composite false twist yarn with improved heat shrinkage characteristics according to claim 1, wherein the copolymer component is at least one copolymer component selected from the group consisting of dicarboxylic acids, diols and bisphenols. 3. The composite false twisted yarn with improved heat shrinkage characteristics according to claim 1, wherein the copolymerization component is isophthalic acid and / or bisphenol A. 4. The composite false twist yarn having improved heat shrinkage characteristics according to claim 1, wherein the yarn is entangled between the core yarn and the sheath yarn. 5. A method for producing a composite false twisted yarn in which two or more kinds of polyester multifilament yarns having a difference in elongation are combined and false-twisted, wherein a stretchable filament yarn can be drawn, and A high shrinkage polyester yarn obtained by copolymerizing a copolymerization component in an amount of 5 to 18 mol% is used, and a polyester yarn having an elongation difference of 80% or more from the low elongation filament yarn is used as a high elongation side filament yarn. And a method of producing a composite false twisted yarn having improved heat shrinkage characteristics, wherein the false false twisting is performed. 6. A composite false twisted yarn obtained by combining and twisting two or more kinds of polyester multifilament yarns having a difference in elongation, wherein the core yarn contains 5 to 18 mol% of a copolymer component.
It is a copolymerized high shrinkage polyester yarn having a yarn length difference of 10% to 45% between a core yarn and a side yarn, and a crimp ratio of 0.1%.
Heat shrinkage (boiling water shrinkage + 180 ° C)
A milled worsted fabric comprising a composite false twist yarn having a dry heat shrinkage ratio of 10% to 35% for warp and / or weft yarns.