JP2001279547A - Polyester composite yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a polyester composite yarn by which the alkali weight reduction is not required or low weight reduction can be obtained and the resultant fabric is soft and lightweight and has sufficient bulkiness. SOLUTION: This polyester composite yarn is produced by doubling a highly oriented undrawn yarn (component A yarn) 11 at 2,500-4,000 m/min spinning speed with a high-speed spin drawn yarn or a drawn yarn (component B yarn) 12 at >=4,000 m/min spinning speed, carrying out simultaneous false twisting (16 and 17) at a temperature within the range of normal temperature to <=100 deg.C and at <=1.2 times draw ratio, imparting a yarn length difference of >=5% to the component A yarn than that of the component B yarn, deforming a part of the component A yarn and then carrying out heat treatment in an ultrashort time for shrinking the component A yarn at >=150 deg.C heater temperature so as to provide the resultant yarn with an extent of no substantially yarn length difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composite yarn which is very lightweight, bulky, stiff, and does not require alkali weight reduction or a sufficiently soft texture at a reduction rate, and a method for producing the same. It is.

2. Description of the Related Art JP-B-61-19733 and JP-B-61-20662 have been proposed as false-twisted two-layer yarns having a spun-like appearance and texture. These have moderate rebound, drapability, and spun-like appearance texture, but at the yarn stage, there is a difference in yarn length, and it is necessary to strongly twist and suppress tatsuki, and alkali weight loss is 20 to 30% by weight. It is indispensable to obtain a hard woven fabric and not a light and bulky woven fabric. As a means for forming a soft woven or knitted fabric, there is a method of performing false twisting at a low temperature. For example, Japanese Patent Publication No. Hei 7-91709, Patent No. 27712
No. 48 proposes a method in which two or more polyesters having a difference in elongation of 70% or more are false-twisted at a glass transition temperature or less and heat-treated at 130 ° C. or more. In this method, the sheath component is evenly stretched, so that the sheath component undergoes uniform spontaneous elongation after boiling water treatment and / or dry heat treatment after boiling water treatment, and is bulky due to a difference in shrinkage from the core yarn. In the bulky structure due to the difference in the contraction of the core and sheath, as in the case of shrink-blend yarn, the loop of the raised sheath yarn is large, long, and the entire sheath yarn is uniformly and uniformly raised. I can't. So it is soft,
Sufficient bulkiness and lightness have not been obtained. In addition, Japanese Patent No. 2760840 discloses a method of increasing the resilience by increasing the single yarn fineness of the yarn having a high elongation to 3.5 denier or more and imparting a fineness variation, but this method contributes to the resilience. Does not have a bulky yarn structure or a potential yarn structure, and a similarly bulky and lightweight woven or knitted fabric has not been obtained.

As described above,
In the prior art, there is a problem that a soft texture and resilience can be obtained, but a material having a light weight and sufficient bulkiness cannot be obtained. For this reason, conventional woven or knitted fabrics using polyester fibers require an alkali weight loss of about 25% by weight, and there are many alkali terephthalate salts generated with the alkali weight loss. There was a big problem of wasting. The present invention solves these problems of the prior art, and it is not necessary to reduce the amount of alkali, or the amount of alkali can be reduced, and the obtained fabric is soft, lightweight and has sufficient bulkiness. An object of the present invention is to provide a polyester composite yarn and a method for producing the same.

To achieve the above object, the polyester composite yarn of the present invention has a birefringence Δn of 40 ×.
A polyester multifilament (component A yarn) in the range of 10 ^{−3 to} 90 × 10 ⁻³ and a birefringence Δn of 100 × 10 3
A simultaneous false twisted composite yarn containing a polyester multifilament (component B yarn) in the range of ^{-3 to} 160 × 10 ^-3 , wherein there is substantially no difference in yarn length between the filaments, and the composition of the component A yarn The filament is characterized by having a deformed portion and / or a thick portion partially and having the following properties. (1) Crimp restoration rate of composite yarn (K1) K1 ≦ 2% (2) Crimp restoration rate after boiling water treatment of composite yarn (K2) 3% ≦ K2 ≦ 15% (3) Latent bulk height (S = K2 / K1) S ≧ 5 In the composite yarn, the boiling water shrinkage is 0% or more and 10% or more.
% Is preferable. In the composite yarn, when the composite yarn is treated in boiling water for 30 minutes, the constituent filaments exhibit fine crimps and become bulky.
It is preferable that the yarn has integrity. That is,
Although the constituent fibers have a degree of freedom, the yarns do not fall apart, but are bulky but have integrity as a yarn. Further, in the composite yarn, it is preferable that the composite yarn has a raw silk-like appearance and has a higher processing passability up to the woven / knitted material forming step. Next, the method for producing a polyester composite yarn of the present invention comprises a highly oriented undrawn yarn (component A yarn) having a spinning speed of 2500 to 4000 m / min, and a high-speed spun drawn yarn or drawn yarn (component B) having a spinning speed of 4000 m / min or more. Yarns), and perform simultaneous false twisting at a temperature range of room temperature to 100 ° C or less and a draw ratio of 1.2 times or less, and the A component yarn gives a yarn length difference that is 5% or more longer than the B component yarn. Then, a part of the A component yarn is deformed, and then a heat treatment is performed at a heater temperature of 150 ° C. or more and a shrinkage of the A component yarn so that there is substantially no difference in yarn length. In the above method,
The heat treatment time at a heater temperature of 150 ° C. or more is preferably 0.2 seconds or less for a contact type heater, and 0.3 seconds or less for a non-contact type heater. Further, in the above method, it is preferable that after the A-component yarn and the B-component yarn are aligned and before the false twisting is performed, a confounding treatment is performed. In the above method, it is preferable that the boiling water shrinkage after simultaneous false twisting is 20% or more, the yarn length difference is 5% or more, and a part of the sheath yarn is deformed.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyester composite yarn comprising at least two kinds of filaments, wherein the polyester multifilament (A component) has a birefringence Δn in the range of 40 × 10 ^{−3 to} 90 × 10 ^−3. Thread) and the birefringence Δ
It is a simultaneous false twist composite yarn containing a polyester multifilament (component B yarn) in which n is in the range of 100 × 10 ^{−3 to} 160 × 10 ⁻³ . The A component yarn is a highly oriented undrawn yarn having a spinning speed of 2500 to 4000 m / min. The B component yarn has a spinning speed of 4000 m / mi.
n or more high-speed spun drawn yarns or drawn yarns. The A-component yarn and the B-component yarn are aligned and simultaneously twisted in a temperature range from room temperature to 100 ° C., whereby the A-component yarn becomes a sheath component, and is drawn to exhibit a difference in yarn length. The B component yarn becomes the core component. At this time, a part of the sheath yarn is deformed by simultaneous false twisting within the range of normal temperature to 100 ° C. Thereafter, heat treatment is performed for a very short time with a heater. Thereby, a processed yarn having substantially no yarn length difference can be obtained. When heat treatment is performed for a very short time by the heater, the deformed portion of the sheath yarn shrinks, and the portion thicker than other filaments remains deformed without heat treatment. As a result, a difference in shrinkage and a difference in spontaneous elongation are given between the filaments of the sheath yarn and in the length direction, and a latently crimped fiber is obtained. Then, dimensional stability is imparted, handleability is improved, and high-order workability up to the process of forming a woven or knitted material is improved. FIG. 1 is an external view of a composite yarn 1 according to one embodiment of the present invention. The composite yarn 1 is composed of a entangled portion 3 and a non-entangled portion 2, and has an appearance of a raw silk (naito) style. That is, there is substantially no yarn length difference between the filaments. Figure 2
FIG. 3 is an observation view of a cut surface of the composite yarn 1, and the constituent filament of the A component yarn has a partially deformed portion and / or a thick portion 4. The composite yarn 1 is a latently crimped fiber, and when treated in boiling water for 30 minutes, as shown in the composite yarn 5 of FIG. 3, the constituent filaments exhibit fine crimps and become bulky. That is, although the constituent fibers have a degree of freedom, the yarns do not fall apart, but are bulky but have integrity as a yarn. This state is also manifested by heat treatment at the time of high-order processing such as dyeing after forming on a woven or knitted fabric. That is, the crimps of the sheath filaments are randomly generated to form voids and become bulkier than before. Although the crimp restoring rate (K1) of this processed yarn is small, the crimp restoring rate (k2) increases by performing boiling water treatment. At this time, when the potential bulk height (S = K2 / K1) is 5 or more, a material having a feeling of bulkiness and lightness can be obtained. In the case of woven or knitted fabrics, the crimps emerge randomly in the dyeing finish, and voids are formed between the filaments,
It is bulky, light and has a soft touch like natural fibers such as wool or cashmere. As a result, the composite yarn of the present invention does not need to be used, or becomes a product in a very reduced amount, in the conventional polyester woven fabric using the polyester twisted yarn, which is indispensable for the alkali weight reduction processing for forming voids between filaments. It became possible. In addition, since it can be used without weight reduction treatment, one step can be omitted, thereby reducing costs and reducing the amount of alkali terephthalate that must be processed after reducing the alkali weight, which affects the global environment. There are no benefits. In the conventional false-twisted two-layer composite yarn 9 shown in FIG. 6, the yarn length difference between the core yarn and the sheath yarn is about 30%, and the core yarn is wound around the sheath yarn, and the density is reduced. It becomes a thread. For this reason, it is difficult to handle, and if used as it is, it will be too strong, and it is necessary to perform strong twisting. As a result, there are no voids,
There is a problem that the fabric becomes hard and a high weight loss is required. In contrast, the polyester composite yarn of the present invention
Substantially no difference in yarn length, good high-order processability up to the woven / knitted fabric forming step, no need for strong twist, sweet twist to medium twist, and no hardening. In addition, the sheath component shrinks and spontaneously expands at random, making it bulkier than before. Further, the conventional different shrinkage mixed yarn 6 shown in FIG. 5 uses a high shrinkage yarn 7 as a core yarn and a non-shrinkage yarn 8 as a sheath yarn. The yarn shrinks, and the non-shrink yarn 8 swells greatly. However, random crimps do not occur, and the sheath yarn has a uniform floating structure, which is bulky but easy to settle. In addition, since the core yarn has a high shrinkage, the density of the woven fabric is reduced and the fabric becomes hard. Therefore, it was necessary to forcibly make a soft finish due to high weight loss. On the other hand, unlike the bulkiness due to the difference in shrinkage from the core yarn, the polyester composite yarn of the present invention does not require the use of a high shrinkage yarn as the core yarn, so it is necessary to forcibly perform a soft finish due to a high weight loss. There is an advantage that there is no. That is, in the present invention, since the sheath yarn becomes bulky, a soft and bulky material can be obtained without the density of the woven fabric being blocked. In addition, this effect makes it possible to obtain a lighter material than ever before. Next, the production method of the present invention will be described in detail. The present invention relates to a composite yarn comprising at least two or more filaments, and has a spinning speed of 4000 as a B component yarn.
High-speed spun drawn yarn or drawn yarn obtained at m / min or more is used. By using a high-speed spun drawn yarn or a drawn yarn obtained at a spinning speed of 4000 m / min or more, it becomes possible to process at a low draw ratio during false twisting. When a highly oriented undrawn yarn having a spinning speed of less than 4000 m / min is used, drawing at a high magnification of more than 1.2 times is required during false twisting, and the sheath component is stretched while being wound around the core yarn, and a false twist zone. Therefore, the sheath yarn is not sufficiently deformed and has a relatively uniform cross section. For this reason, the core yarn has a spinning speed of 40
It is necessary to use a high-speed spun drawn yarn or a drawn yarn obtained at a speed of at least 00 m / min. A component yarn spinning speed 2500-4000m / mi
Use n highly oriented undrawn yarns. If the spinning speed is less than 2500 m / min, the crystal orientation is unstable, so that yarn breakage and fluff are likely to occur in the false twisting step. In addition, since the heat treatment is easily performed, the thick portion and the deformed portion become uniform. For this reason, a spinning speed of less than 2500 m / min is not preferable. 4000m / min
Exceeding this is undesirable because the boiling water shrinkage rate decreases, and random shrinkage and spontaneous elongation characteristics during heat treatment hardly occur.
Therefore, the component A yarn used in the present invention has a spinning speed of 2500 to 4000 m /
A highly oriented undrawn yarn of min is preferred. Next, the A-component yarn and the B-component yarn are aligned, and an entanglement process is performed by jetting an air jet. This is because if the core-sheath component separates after false twisting and untwisting and heat treatment, it becomes a nep, and handling becomes difficult in high-order passage. Preferably, the number of entanglements is 10 to 100 / m. If the number of entanglements is less than 10, the yarn is separated by ironing in a high-order passage, resulting in a nep. On the other hand, if the number exceeds 100, the number of entanglement points becomes too large and it is difficult to increase the bulk, which is not preferable. This entanglement treatment may be performed after the A component yarn and the B component yarn are aligned, or may be performed after the heat treatment. In addition, the number of entanglements may remain even after the knitted fabric is obtained. A
When the blending of the component yarn and the B component yarn is good, the entanglement treatment can be omitted. Next, simultaneous false twisting is performed in the range of room temperature to 100 ° C. Room temperature is generally around 25 ° C, but the room temperature for processing in summer and winter may change, and about 15 to 35
It is around ° C. The false twisting temperature is preferably from room temperature to 100 ° C., and if the temperature is lower than room temperature, it is difficult to control the temperature, which is not preferable. Also, 10
When the temperature exceeds 0 ° C., the crystallization of the yarn proceeds and the crimp is fixed, so that the composite yarn of the present invention is not obtained. In the present invention, it is essential that the false twist temperature is from room temperature to 100 ° C. When simultaneous false twisting is performed at this temperature, the sheath yarn having high elongation is drawn while being wound around the core yarn having low elongation, and then untwisted. In this step, most of the filaments of the sheath yarn are not deformed as in the case of ordinary composite false twisting.
Even in the temperature range of, a part of the filament of the sheath yarn is deformed. Since the sheath component is subjected to false twisting at a temperature of 100 ° C. or less, crystallization hardly progresses, and the shrinkage rate remains high. It is important that a shrinkage ratio remains after false twisting, and the difference in yarn length is almost eliminated in the next heat treatment step, and shrinkage and spontaneous elongation characteristics can be imparted between filaments and in the length direction. As a result, a loop can be randomly generated in the heat treatment step of the higher processing. The yarn immediately after the simultaneous false twisting has a yarn length difference as obtained by composite false twisting. At this time, the yarn length difference is preferably 5% or more, and if it is 5% or less, it becomes difficult to obtain random shrinkage and spontaneous elongation characteristics by heat treatment. Therefore, the yarn length difference is preferably 5% or more. Further, if the yarn length difference exceeds 40%, a nep tends to occur after untwisting. Therefore, the yarn length difference is preferably 5 to 40%, and more preferably 15 to 35%. Next, heat treatment is performed by a heater. The heater temperature is
150-250 ° C is preferred. If it is lower than 150 ° C., the heat treatment is insufficient and the yarn of the present invention is not obtained. If the temperature is 250 ° C. or higher, the deformed portion and the thick portion are heat-treated to form a uniform yarn and lose random shrinkage and spontaneous elongation characteristics. Therefore, the heater temperature is preferably 250 ° C. or lower. The heat treatment temperature depends on the thickness of the yarn, the type of heater (contact type, non-contact type),
Set appropriately according to the heater length. The heater touch time at this time is preferably 0.2 seconds or less for a contact type heater. In a non-contact type heater, the heat transfer is reduced, so that it is preferably 0.3 seconds or less. If the treatment time is exceeded, the deformed portion and the thick portion are heat-treated to form a uniform yarn, and random shrinkage and spontaneous elongation characteristics are lost. That is, heat treatment for an extremely short time is preferable. The retention ratio in the length direction of the yarn during heat treatment is -1% to + 10%
It is preferable to keep it at less than -1%, and if it is less than -1%, the working tension becomes too high, and there is a problem in workability. On the other hand, if it exceeds + 10%, the contraction rate of the sheath yarn is high, and the core yarn and the sheath yarn are reversed, which is not preferable. For this reason, the yarn retention is -1% to + 10%
And more preferably 0 to + 5%. Since the yarn immediately after simultaneous false twisting is not subjected to false twisting at a temperature at which crystallization proceeds, the composite yarn is a yarn having high heat shrinkage. At this time,
The boiling water shrinkage is preferably 20% or more, and if it is less than 20%, shrinkage after heat treatment and spontaneous elongation cannot be imparted. Therefore, the boiling water shrinkage is preferably 20% or more. Since the shrinkage of the sheath component (component A yarn) is high, the yarn shrinks rapidly by the heat treatment, and becomes a yarn having substantially no difference in yarn length. In addition, since the difference in yarn length is 5% or more, heat is received differently between the outside and the center of the yarn, so that heat treatment unevenness is likely to occur. At this time, the deformed portion of the sheath yarn (A component yarn) is subjected to heat treatment so that the thick portion and / or
Alternatively, there is a portion where the deformed portion remains without heat treatment. The undeformed portion has a spontaneous elongation characteristic because it is subjected to a fixed length or relaxed heat treatment. In this way, the random shrinkage and spontaneous elongation characteristics can be imparted by randomly mixing the deformed portion and the thick portion between the filaments of the sheath component. In the present invention, by random shrinkage, spontaneous elongation characteristics, boiling water treatment, and subsequent dry heat treatment, the thick part and / or deformed part shrinks, the undeformed part spontaneously expands, and the thick part, starting from the deformed part The filament bends. In addition, since the filaments appear randomly due to random shrinkage and spontaneous elongation characteristics, the bulkiness is increased. In the conventional composite false twist, low temperature false twist, different shrinkage mixed fiber, spontaneously stretched mixed fiber, the filaments are uniformly raised,
Despite the high yarn length difference, the protruding loop is easily set, so that the bulkiness is poor. The yarn of the present invention is characterized in that since the filaments emerge randomly between filaments and in the length direction, the yarn becomes bulky without using a highly shrinkable yarn as the core yarn. The composite yarn of the present invention has a crimp restoring rate
(K1) is small, but the crimp restoration rate (K2)
Increase. Boiling water increases the crimp restoring rate (K2), and unlike conventional spontaneously elongated yarn, a strong crimp can be obtained. To be felt. The crimp restoring rate (K1) of the composite yarn is preferably 2% or less, and if it exceeds 2%, the core yarn remains crimped, resulting in poor resilience. Therefore, the crimp restoring ratio (K1) of the composite yarn is 2% or less, more preferably 1% or less. In addition, the crimp restoring rate (K2) after the boiling water treatment indicates the strength of the crimp that emerges, and the higher the crimp, the less the sag and contribute to the bulkiness. For this reason, the content is preferably 3% or more and 15% or less, and if it is less than 3%, even if the yarn length difference is large and crimps are developed, the bulkiness is poor and it is easy to set. By setting it to 3% or more, the crimp of the crimp that has emerged is strong, and when it is made into a fabric, the set when pressed down from above is reduced, and the fabric becomes bulky. It is more preferably at least 5%.
On the other hand, if it exceeds 15%, the yarn will float too much, or crimp will develop too much, causing the yarn to overwhelm. Therefore, the content is preferably 15% or less, more preferably 10% or less. The potential bulk height at this time (S = K
When 2 / K1) is 5 or more, it becomes easy to handle in high-order processing. Further, after the fabric is formed, a difference in yarn length appears in the dyeing and finishing step, and a bulky and lightweight material is obtained. When the latent bulk height is less than 5, even if the yarn emerges in the dyeing and finishing step, there is no crimp strength, and the yarn does not feel bulky. The conventional composite false twist yarn has a large difference in yarn length and a high crimp restoring rate (K1), so that it is difficult to handle, and the core yarn is twisted, so that a feeling of rebound is poor. Further, even when the crimp restoration rate (K2) after the boiling water treatment is increased, the potential bulk height is small, light, and the bulkiness is poor. In addition, the conventional different shrinkage mixed yarn and spontaneously stretchable mixed yarn have a small crimp restoring ratio (K1), but a crimp restoring ratio (K1) after boiling water treatment.
Since 2) is also small, the potential bulk height (S) is small, and apparently a large difference in yarn length is exhibited, but the loop is easily formed, and the feeling of weight and bulkiness is poor. The boiling water shrinkage of the composite yarn of the present invention is
It is preferably 0% or more and 10% or less. Since the random behavior of the sheath yarn is likely to be exhibited by shrinking, the shrinkage is required to be 0% or more. If the shrinkage is too high, the fabric becomes hard as in the prior art. Therefore, the shrinkage is preferably 10% or less, more preferably 3% or more and 8% or less. Next, a manufacturing method according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a schematic view showing this method, in which the A component yarn 11 and the B component yarn 12 are respectively pulled out from the bobbin and entangled between the first nip roller 13 and the second nip roller 15 using the air entanglement nozzle 14. To process. This confounding process is not essential. Next, a false twist is performed between the second nip roller 15 and the third nip roller 18 using the false twist heater 16 and the false twist twister 17. Next, heat treatment is performed for a very short time while maintaining a predetermined holding ratio in a heat treatment machine 19 between the third nip roller 18 and the fourth nip roller 20. Next, the fourth nip roller 20
And the fifth nip roller 22 using the air entanglement nozzle 21 to perform the entanglement processing. This confounding process is not essential. Next, using the winding device 23, the composite yarn of the present invention is wound.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. First, the measurement method will be described. <Boiling water shrinkage> An initial load of 1/10 (g /
In d), make a 20-roll case. After removing the cassette from the wrap reel and leaving it to stand for 24 hours, apply an initial load of 1/30 g of the displayed denier, and measure the length L0 of the cassette after 30 seconds. The moss is wrapped in gauze and treated in boiling water for 30 minutes. Take out the treated scallop and leave it for 12 hours or more after dehydration. After standing, display the scab. Apply an initial load of 1/30 g of the displayed denier and measure L1.
The boiling water shrinkage ratio is obtained from the following equation (1). Boiling water shrinkage rate (%) = (L0-L1) x 100 / L0 (Equation 1) <Crimping restoration rate (K1)> With a wrap reel of an appropriate peripheral frame, initial load 1/10 (g / d) Make a 20-roll case. Remove the cassette from the wrap reel and leave for 24 hours. A water tank is prepared, a load of 0.1 g / d and an initial load of 0.002 g / d are applied in water at a water temperature of 25 ° C., and the length L0 is measured after 2 minutes. Then 0.1g / d
Is removed, and the length L1 is measured after 2 minutes. The crimp restoring rate is measured by the following formula 2. Crimp restoration rate (%) = (L0−L1) / L0 × 100 (Equation 2) <Crimping restoration rate (K2)> With a wrap reel having an appropriate peripheral frame, with an initial load of 1/10 (g / d) Make a 20-roll case. Remove the cassette from the wrap reel and leave for 24 hours. Wrap the moss in gauze and treat in boiling water for 20 minutes. A water tank is prepared, a load of 0.1 g / d and an initial load of 0.002 g / d are applied in water at a water temperature of 25 ° C., and the length L2 is measured after 2 minutes. Subsequently, the load of 0.1 g / d is removed, and two minutes later, the length L3 is measured. The crimp restoring ratio is measured by the following formula 3. Crimp Restoration Rate (%) = (L2-L3) / L2 × 100 (Equation 3) <Latent Bulk Height (S)> The Crimp Restoration Rate (K1) and Crimp Restoration Rate (K
From 2), the potential bulk height is measured by the following formula 4. Latent bulk altitude = K2 / K1 (Equation 4) <Cross section deformation> Take a cross section photograph of any 10 places, and the cross section will be deformed if at least one section is deformed from the raw material before processing. Suppose <Thick part> A cross-sectional photograph of ten arbitrary locations is taken. If there is a filament having a cross-sectional area 1.05 times or more that of the filament having the smallest cross-sectional area, it is regarded as a thick part.

Example 1 A polyester composite yarn was produced by the processing method shown in FIG. Stretched yarn (total fineness:
75 denier, 36 filaments (hereinafter "75 denier 36
Filament)), undrawn polyester multifilament yarn with a spinning speed of 3000 m / min as a sheath component (total fineness: 80 denier, 24 filaments)
After entanglement at an air pressure of 3 kg / cm ² using an interlace nozzle, stretching ratio is 1.01 times, and normal temperature (approx.
25 ° C), and then a heater temperature of 200 ° C
And heat-treated at a retention of 1% and wound up. A non-contact heater was used. The obtained composite yarn was made into a twist yarn having a number of twists of 1000 T / M, and woven at a warp density of 116 yarns / inch and a weft density of 76 yarns / inch by a textured double weave. Next, alkali treatment with a 5% by weight of alkali was carried out by a conventional method, and dyeing was carried out. As a result, a light-weight, bulky, soft, repellent material with a slimy feeling close to cashmere was obtained. Table 1 summarizes the conditions and results.

Example 2 A polyester composite yarn was produced by the processing method shown in FIG. High-speed spun drawn yarn 60 denier 24 filament with a spinning speed of 5500 m / min as the core component, spinning speed as the sheath component
3000m / min polyester multifilament undrawn yarn 8
Using 5 denier 48 filaments, they are aligned and entangled with an interlace nozzle at an air pressure of 3 kg / cm ² , and then subjected to simultaneous false twisting at a draw ratio of 1.10 times and a heater temperature of 90 ° C., and then a retention rate of + 5% and non-contact Heat treatment was carried out at a mold heater temperature of 180 ° C, and the obtained composite yarn was twisted at 1200 T / M, and woven with a texture density of 126 yarns / inch and a weft density of 86 yarns / inch in a textured double weave. As a result, a material having light weight, bulk, softness and resilience was obtained as in Example 1. Table 1 summarizes the conditions and results.

Comparative Example 1 A polyester composite yarn was produced by the processing method shown in FIG. Using a drawn yarn 75 denier 36 filament as the core component and a polyester multifilament undrawn yarn 80 denier 24 filament with a spinning speed of 3000 m / min as the sheath component, and using an interlace nozzle, air pressure 4k
g / cm ² entanglement, stretching ratio 1.04 times, heater temperature 200
At the same time, the resulting composite yarn is twisted to 1500 T /
Twisted with M, warp density 108 strands / inch, weft density 70 strands / inch
When the fabric was woven in a double-weave structure, the weight was reduced by 25%, and the fabric was dyed and finished, it was a hard, heavy material with moderate rebound and drape. Table 1 summarizes the conditions and results.

Comparative Example 2 A polyester composite yarn was produced by the processing method shown in FIG. High-speed spun drawn yarn of 60 denier 24 filament with a spinning speed of 7500 m / min as the core component, and spinning speed as the sheath component
3000m / min polyester multifilament undrawn yarn 8
With 0 denier 24 filament, was entangled in air pressure 4 kg / cm ² in interlaced nozzles aligned drawn, draw ratio 1.04 times, conducted simultaneously false twisting at a heater temperature 120 ° C., number twisted composite yarn obtained 1500T / M twisted yarn, warp density 1
Weaving with a texture / double weave at 08 lines / inch and a weft density of 70 lines / inch, weight reduction of 25%, and dyeing. After a moderate repulsion, drape, and softness, the texture becomes bulky. It became a scarce and heavy material. Table showing conditions and results
Shown in 1.

Comparative Example 3 A polyester composite yarn was produced by the processing method shown in FIG. Using a high-density undrawn yarn of 175 denier 36 filaments with a spinning speed of 3000 m / min as the core component and a polyester multifilament low-oriented undrawn yarn of 230 denier 48 filaments with a spinning speed of 1500 m / min as the sheath component. After confounding at a pressure of 4 kg / cm ² , simultaneous stretch false twisting is performed at a draw ratio of 1.6 times at room temperature (25 ° C), and then a heat treatment is performed at a retention of 0% and a non-contact type heater temperature of 200 ° C. The composite yarn was twisted at 1000 T / M, twisted at 98 warp / inch, weft density 63 warp / inch, and woven in a double warp weave. The fabric was soft and had a repulsive feeling but lacked bulkiness and lightness. Table 1 summarizes the conditions and results
Shown in

【table 1】 As is evident from Table 1, Examples 1-2 were within the scope of the present invention, so that a good fabric was obtained even when the alkali weight loss rate was 0-5% by weight. On the other hand, in Comparative Example 1, since the false twist temperature was 200 ° C., the weight loss was 25% by weight compared to the case of normal polyester, and the feeling of weight was particularly poor. In Comparative Example 2, false twisting was performed at a relatively low temperature, but the heat treatment immediately after the false twisting step was not performed, so that the lightweight feeling was also poor. Further, Comparative Example 3 was a combination of a highly oriented undrawn yarn and a low oriented undrawn yarn, and thus had poor bulkiness and lightness.

As described above, according to the present invention, there is no need to reduce or reduce the amount of alkali,
In addition, the obtained fabric is soft and can provide a lightweight, sufficiently bulky polyester composite yarn and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is an external view of a composite yarn 1 according to one embodiment of the present invention.

FIG. 2 is an observation view of a cut surface of the composite yarn of FIG. 1;

FIG. 3 is an external view of a composite yarn exhibiting bulkiness after boiling water treatment.

FIG. 4 is a process chart showing a manufacturing method according to one embodiment of the present invention.

FIG. 5 is an external view of a composite yarn using a conventional different shrinkage mixed fiber when the bulkiness is developed.

FIG. 6 is an external view of a conventional false-twisted two-layer yarn formed by composite false twisting. REFERENCE SIGNS LIST 1 composite yarn 2 non-entangled part 3 entangled part 4 deformed part and / or thick part 5 composite yarn after treatment in boiling water of the present invention 6,9 composite yarn after treatment in conventional boiling water 7 shrinkable fiber 8 non Shrinkable fiber 11 Highly oriented undrawn yarn (A component yarn) 12 High speed spun drawn yarn or drawn yarn (B component yarn) 13, 15, 18, 20, 22 Nip roller 14, 21 Air entangled nozzle 16 False twist heater 17 False twist Twister 19 Heat treatment machine 23 Winding device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L036 MA05 MA24 MA26 MA33 MA39 PA05 PA14 PA18 PA46 RA03 UA01

Claims (7)

[Claims] 1. A birefringence index Δn of 40 × 10 ^{−3 to} 90 × 10
^{-3 in} the range of polyester multifilament (component A yarn) having a birefringence Δn of 100 × 10 ^{−3 to} 160 × 10 ³
A simultaneous false twisted composite yarn comprising a polyester multifilament (B component yarn) in the range of ^-3 , wherein there is substantially no difference in yarn length between the filaments,
The constituent filaments of the component yarn are partially deformed and / or
Or, a polyester composite yarn having a thick portion and having the following characteristics. (1) Crimp restoration rate of composite yarn (K1) K1 ≦ 2% (2) Crimp restoration rate after boiling water treatment of composite yarn (K2) 3% ≦ K2 ≦ 15% (3) Latent bulk height (S = K2 / K1) S ≧ 5 2. The polyester composite yarn according to claim 1, wherein the composite yarn has a boiling water shrinkage of 0% or more and 10% or less. 3. The composite yarn has a raw silk-like appearance,
When the composite yarn is treated in boiling water for 30 minutes, the constituent filaments develop fine crimps and become bulky,
The polyester composite yarn according to claim 1 or 2, which has integrity as a yarn. 4. A highly oriented undrawn yarn (component A yarn) having a spinning speed of 2500 to 4000 m / min and a high-speed spun drawn yarn or drawn yarn (component B yarn) having a spinning speed of 4000 m / min or more are brought together. The simultaneous false twisting is performed at a temperature range of 100100 ° C. or less and a draw ratio of 1.2 times or less, and the A component yarn is 5 times less than the B component yarn.
% And a part of the A-component yarn is deformed, and then the heat treatment is performed at a heater temperature of 150 ° C. or more and the A-component yarn is shrunk so that there is substantially no difference in the yarn length. A method for producing a polyester composite yarn. 5. A heat treatment time at a heater temperature of 150 ° C. or more,
The method for producing a polyester composite yarn according to claim 4, wherein the time is 0.2 seconds or less for a contact type heater and 0.3 seconds or less for a non-contact type heater. 6. The method for producing a polyester composite yarn according to claim 4, wherein the entanglement treatment is performed after the A component yarns and the B component yarns are aligned and before the simultaneous false twisting. 7. The shrinkage of boiling water after simultaneous false twisting is 20% or more, the yarn length difference is 5% or more, and a part of the sheath yarn is deformed.
7. The method for producing a polyester composite yarn according to any one of items 6 to 6.