KR20110077532A - Composite fibers of high elastic polyester and method of manufacturing the same - Google Patents

Abstract

PURPOSE: A high elastic polyester composite fiber and a manufacturing method thereof are provided to manufacture latent crimp fiber having excellent crimpiness and extension recovery rate by controlling a high-speed spinning and a drawing process. CONSTITUTION: The high elastic polyester composite fiber and the manufacturing method thereof are as follows. In order to form a melting material, different kinds of polyester, a polytrimethylene terephthalate (PTT) and a polyethylene terephthalate (PET) are melted respectively. The composite fiber fully drwan yarn (FDY) of a side-by-side type dries up the melting material with a spinning speed of 4,500 - 6,000m / min. The FDY(4) is dried up at a drawing temperature of 60 - 95°C.

Description

High stretch polyester composite fiber and its manufacturing method {COMPOSITE FIBERS OF HIGH ELASTIC POLYESTER AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a high-strength polyester composite fiber and a method for manufacturing the same, specifically high-stretched composite spinning of polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT), a heterogeneous polyester polymer The present invention relates to a polyester composite fiber, a method for producing the same, and a fabric and a circular knitted fabric using the high-stretch polyester composite fiber.

Recently, as the demand for high elasticity fabrics in sportswear and general apparel increases, polyethylene terephthalate (PET) side-by-side type and polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) having different viscosity are different. ), A stretchable latent crimp yarn prepared by a method of expressing a crimp by a heat shrinkage difference imparted during fabric fabrication by complex spinning in a side-by-side manner.

In Japanese Patent Laid-Open No. 1998-72732 and Japanese Patent Laid-Open No. 1997-209217, a method using two kinds of polyethylene terephthalate (PET) having extreme viscosity difference, and Japanese Patent Laid-Open No. 1991-161519 and Japanese Patent Laid-Open No. In 1997-414234, a method for producing a polyester-based latent crimpable fiber using a highly shrinkable copolymerized polyethylene terephthalate (PET) is known. However, the latent crimps produced by the above method still have only a lower elasticity than the spandex covering yarns, and their use has been limited. In addition, the spandex covering company is weak in chemical resistance, requires a separate covering process, due to the problem of embrittlement during the dyeing process can not be used alone because it can not be obtained as a relatively thick fabric market demanding increasingly thin fabric It did not meet.

As an alternative to solve this problem, latent crimps using polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) appeared in U.S. Patent No. 3,671,379, and the demand for this is increasing. However, the latent crimps produced by the conventional method, in the case of general stretchable composite fibers, have a fixability of 70% or less at the time of heat set after unloaded non-water treatment, and elastic modulus at 10% elongation before and after heat set. Since the change rate of breaking elongation is more than 20%, the shape deformation occurs severely during the post process or after the final processing, which makes it difficult to set the conditions and stabilize the dimensions when processing the product.

In addition, Korean Patent Invention No. 629813 satisfies that the stress for 50% elongation of yarn after heat treatment is 30 × 10 ⁻³ cN / dtex or less, and the recovery rate is 60% or more. There has been proposed a yarn which is a polyester yarn comprising an eccentric composite yarn composed of two kinds of polyester components including polytrimethylene terephthalate (PTT). However, when one of the two composite components is used as polytrimethylene terephthalate (PTT), the soft stretch property is excellent, but the latent crimped fiber has excellent elasticity recovery rate, soft high elasticity and elongation recovery rate, which is a recent trend of fabrics. Was not developed.

In addition, Korean Patent Invention No. 700796 discloses i) PTT having an intrinsic viscosity of 0.96 to 1.20 as the first component polymer and PET, PTT and PBT having an intrinsic viscosity of 0.40 to 0.55 as the second component polymer. Complex spinning to have a side by side shape at 8-8: 2 to obtain an unstretched tow; ii) stretching the unstretched tow to a stretching temperature of 50 to 90 ° C. and a heat setting temperature of 100 to 200 ° C .; iii) The method for producing a spontaneous highly crimped polyester-based composite short fiber, comprising the step of imparting a crimp so that the stretched tow has a crimp at 8 ~ 16EA / Inch. However, as described above, since the short fiber form cannot be used directly on the fabric, it has a long process of spinning afterwards in order to use it as a fabric, and islands are also manufactured differently from long fibers.

In most of the existing yarns, POY (Partially Oriented Yarn) is manufactured at a spinning speed of 2,000 to 3,500 m / min or less. Products have been manufactured. Therefore, there arises a problem of productivity deterioration caused by stretching in two stages.

On the other hand, when increasing the spinning speed to improve the productivity, the cutting of the yarn during spinning is often poor workability, the main cause of the material properties of the yarn is significantly changed, there is also a difficult problem to control the properties of the yarn. Therefore, simply increasing the spinning speed does not improve productivity, while the spinning speed is improved, the productivity and workability are good, and the touch is soft and the elasticity is excellent.

In order to solve the above problems, an object of the present invention is a method for producing a latent crimped fiber having excellent crimping properties and elongation recovery rate through high-speed spinning and stretching process control, and by using the same, dense, soft and excellent elasticity and stretch recovery rate It is to provide a fiber and a method for producing the same.

In addition, another object of the present invention is to control the spinning conditions and stretching conditions to control the crimping characteristics, the maximum stress temperature, the maximum stress value in the yarn and soft stretch polyester composite fiber than the existing potential crimps and improved elastic properties And to provide a method for producing the same.

In addition, another object of the present invention is to provide a highly stretch polyester composite fiber and a method for producing the same having excellent workability and improved productivity.

In addition, another object of the present invention is to provide a high-strength polyester composite fiber and a method for producing the same that can be easily produced as a circular knitted fabric as well as fabric.

In order to achieve the above object, the present invention provides a melt forming step of melting polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET), which are heterogeneous polyesters, respectively; and spinning the melt at a spinning speed of 4,500 to 6,000 m. It provides a method of producing a high-stretch polyester composite fiber comprising a; to obtain a side-by-side type composite fiber drawn yarn (FDY) as / min.

In addition, the present invention is characterized in that the stretching temperature in the step of obtaining with the drawn yarn (FDY) is 60 to 95 ℃. In addition, the present invention may further include the step of heat-treating the stretched yarn (FDY) to 110 ~ 130 ℃ after the step of obtaining the stretched yarn (FDY).

The intrinsic viscosity (IV) of the polytrimethylene terephthalate is 0.90 to 1.10 dl / g, and the intrinsic viscosity (IV) of the polyethylene terephthalate is 0.50 to 0.65 dl / g.

In addition, the content ratio of the polytrimethylene terephthalate and polyethylene terephthalate is characterized in that 45:55 to 50:50.

In addition, the present invention is a composite fiber in which the polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET), which are different kinds of polyesters, are spun in a side-by-side type, and (1) the elongation at break is 30% to 45%, (2) the maximum stress value of dry heat shrinkage stress is 0.2 to 0.5 G / D, (3) the temperature at dry heat shrinkage maximum stress is 180 to 220 ° C, and (4) the shrinked length is 30 after LEESONA measurement. To 40 cm, (5) elastic recovery rate is 35 to 50%, and (6) high stretch polyester composite fiber, characterized in that the number of entanglement is 5 to 20 / m, side-by-side type potential It has the characteristics of a fabric having elasticity of 30% or more of a crimped composite island flow path.

In addition, the composite fiber of the present invention is characterized in that the (7) fabric elongation recovery is 90 ~ 99%.

The present invention provides a fabric, characterized in that the fiber produced by the above method or using the fiber in the inclined or weft yarn using the twisted yarn or lead-free.

It provides a fabric characterized in that the polyester-based latent crimp composite fiber produced by the present invention is used as a warp or weft yarn using twisted or lead-free.

In addition, the present invention provides a knitted fabric characterized in that the polyester-based latent crimped composite fiber produced in the present invention is produced in circular knitting using twisted or lead-free.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. To help, the disclosures with accurate or absolute figures are used to prevent unscrupulous infringers from unfair use.

The present invention is to propose a method for producing latent crimped composite fibers having soft and excellent stretch properties and elongation recovery rate using polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET), which are heterogeneous polyesters. .

1 is a schematic diagram of a composite spinning apparatus according to a preferred embodiment of the present invention. Referring to FIG. 1, the individual fibrous polymers spun through the ejection holes through a melting step passing through an extruder 1 into which different raw materials are introduced, respectively, are formed in each spinneret and directly below the spinneret. After passing through the spin pack (2) containing the spinneret of the through the first gourd roller (3) to produce a drawn yarn (Full Drawn Yarn; FDY), heat treatment in the second gourd roller (5) side-by A composite fiber of -side type is obtained.

In the composite spinning apparatus of FIG. 1 used in the present invention, the individual fibrous polymers spun through the discharge holes are obtained in a side-by-side type just below the spinneret.

The polyester composite fiber of the present invention is a polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET), which is a heterogeneous polyester, and the intrinsic viscosity (IV) of the PTT is 0.90 to 1.10 dl / g, A melt forming step of melting the intrinsic viscosity (IV) at 0.50 to 0.65 dl / g; Obtaining the side-by-side composite fiber obtained by complex spinning of the melt at a spinning speed of 4,500 to 6,000 m / min as a stretch yarn (FDY) at a drawing temperature of 60 to 95 ° C .; Heat-treating the stretched yarn at 100 to 130 ° C.

The present invention is characterized in that the first component is polytrimethylene terephthalate (PTT) and the second component is polyethylene terephthalate (PET). More specifically, the PTT and PET are spun through separate discharge holes, respectively, through the melting step using the composite spinning device of FIG. 1.

The ratio of PTT and PET of the present invention is 45:55 to 50:50, but when the ratio of PTT exceeds 50, there is a disadvantage in that elasticity is reduced.

The intrinsic viscosity (IV) of the PTT is 0.90 to 1.10 dl / g, and the intrinsic viscosity (IV) of PET is preferably 0.50 to 0.65 dl / g. There is a problem that the adhesion strength of the liver is significantly lowered, there is a problem in the workability during spinning if the intrinsic viscosity exceeds the above range, the elasticity is lowered if the viscosity difference with PTT is small in the case of PET over the above range. When testing the stretch properties of yarns and fabrics by varying the viscosity of the polymers of PTT and PET, it is advantageous to express the stretch properties as large as possible the difference in viscosity between the two polymers.

In the present invention, the drawn yarn (FDY) completely drawn in one step of drawing at the same time as spinning is produced. Unlike the existing method of manufacturing the melt by using a partially drawn yarn (POY) and drawing through two stages of stretching, the process is completed even after only one stage of stretching after spinning the PTT and PET melt. The stretched stretched yarn (FDY) is manufactured to eliminate the need for a separate secondary stretching step, thereby shortening the process, and when the fabric is manufactured, the elasticity is good as well as a new touch with a tight and soft feeling.

Spinning speed is 4,500 to 6,000 m / min and the spinning speed is 4,500 to 5,500 m / min as a manufacturing method for the physical properties of the composite fiber of the present invention. Spinning proceeds faster than the existing 2,000 ~ 3,500m / min, and one step of stretching and fast speed can give a new feeling of tightness, soft and elastic new texture and increase productivity. . In addition, when it is manufactured at the spinning speed in the above range, while the spinning workability is smoothly progressed without any defects such as yarn cutting, the touch is soft and the elongation at break is more than 30%, preferably 30-45%, that is, the potential having elasticity. Crimped yarn can be manufactured. Therefore, the spinning speed in the above range may contribute to productivity improvement as well as physical property expression and working stability. Therefore, if the fiber spinning speed exceeds 6,000m / min, the spinning workability is significantly reduced, there may be a problem in producing the fiber, if the spinning speed is less than 4,500m / min, the elasticity of the fiber produced is low required elasticity There is a possibility that it does not reach, and partial non-uniform crimp is generated, which makes it difficult to manufacture a uniform yarn. Therefore, the spinning speed is a very important factor that influences the spinning workability and the properties of the fiber produced.

In addition, in the stretching process of the present invention, proper temperature setting is very important as the stretching temperature and the stretching ratio have a great influence on the crimp characteristics of the composite fiber. It is preferable that the extending | stretching temperature of this invention shall be 60-95 degreeC. When the stretching temperature is less than 60 ℃ fiber uniformity is lowered, the quality is in a poor state, when the stretching temperature exceeds 95 ℃ workability is poor and the fiber is easily broken.

In addition, in the present invention, the heat treatment temperature is also an important factor, so that the crimping characteristics can be improved by controlling the maximum stress expression temperature by appropriately adjusting the heat treatment temperature, preferably 110 to 130 ° C. When the heat treatment is less than the above range, the crimp variation of the composite fiber is severely generated, and when the heat treatment is exceeded the above range, the workability is not good and the manufacturing cost is high.

Figure 2 is a SEM photograph showing the cross-sectional shape of a high-stretch polyester composite fiber according to an embodiment of the present invention. Referring to Figure 2, it can be seen that the composite fiber of the side-by-side form was prepared uniformly.

The polyester-based latent crimping yarn according to the present invention adjusts the spinning conditions and the stretching conditions, so that the maximum stress initiation temperature is 80 to 100 ° C, the maximum stress expression temperature is 180 to 220 ° C, and the maximum stress value is 0.2 to 0.5 g /. It is a side-by-side type composite filament (long fiber) manufactured to have the required crimping properties and elastic recovery rate of the yarn by adjusting to d level. In addition, the high-stretch polyester composite fiber of the present invention has an elongation at break of 30% to 45%, the maximum stress value of dry heat shrinkage stress is 0.2 to 0.5 G / D and the temperature at the time of the maximum heat shrinkage stress is 180 to 200 ℃ , The side-by-side latent crimped composite fiber, characterized in that the shrinkage is 30 to 40cm after measuring the LEESONA, 5 to 20 / m, the elongation at break more than 30%, Fabric stretch recovery is characterized by having an elasticity of 90 to 99%. The main purpose of this elasticity is to give comfort when wearing clothes. When the elongation at break is less than 30%, the elasticity is poor, and when the elongation at break exceeds 45%, the branch of the yarn ( Winding paper) is crushed and there are too many crimps, which may make workability difficult in the process from yarn production to weaving. Polyester composite fiber that satisfies all the properties of the above range can exhibit a new touch different from the existing having a dense yet soft touch and excellent elasticity.

The composite fiber of the present invention has a feature that exhibits elasticity of 30 to 45% of the elongated yet soft touch and elongation at break, which is different from the existing stretch fiber showing only a soft stretch, and is easily manufactured using a circular knitting machine as well as a fabric. There is an advantage that can be applied to various uses.

According to the present invention, when the fiber prepared by the above method or the fiber is manufactured in the form of woven fabric or knitted fabric using warp yarn or warp yarn as twist yarn, the physical properties are different from those of manufacturing non-twist yarn. The characteristics of the fabric can be adjusted even in the form of twist or fabric.

As described above, the fiber produced by the method of the present invention exhibits elasticity and uniformity and softness superior to existing latent crimp-expressing fibers, and has a higher spinning speed than the method for producing crimp-expressing fibers. Due to the stable process, the operation is very effective.

In addition, the method of manufacturing a composite fiber of the present invention is conventionally subjected to a two-step drawing process of the second drawing after the partially drawn yarn, whereas a completely drawn yarn is produced through a one-step drawing process immediately after spinning, with a high spinning speed Productivity is improved.

In addition, the present invention is capable of producing a latent crimped fiber with excellent crimping properties and excellent elongation recovery through stable spinning process and stretching process control, and can produce a fabric having a new touch unlike the existing one by having a dense, soft and excellent elasticity. have.

The composite fiber produced by the production method of the present invention can provide a fabric having a stretch elongation of at least 30% as the polyester-based latent crimping yarn.

In addition, the composite fiber produced by the present invention has an advantageous effect to produce not only a fabric but also a knitted fabric.

Through the following examples will be described in more detail.

Example  One

PTT having an intrinsic viscosity of 1.10 dl / g and PET having an intrinsic viscosity of 0.55 dl / g were spun at a spinning speed of 5,000 m / min, and treated at a temperature of the first gourd roller (stretching temperature) of 70 ° C. and a heat treatment temperature of 120 ° C. A polyester latent crimped composite filament yarn of side-by-side form having a total denier of 150 denier while having a thickness of mono denier was 3.1 denier was prepared.

The yarn, which is a polyester latent crimped composite filament yarn manufactured in the above manner, was twisted with 800TM and used as warp and weft yarns to be woven into plain weave in a waterjet loom, and then subjected to salt processing according to conventional processing conditions.

Physical properties such as elongation rate and elongation recovery rate of dyed fabrics were measured 10 times based on KSK standard and the results are shown in Table 1.

Example  2

Except that the prepared yarn was lead-free was prepared in the same manner as in Example 1.

Example  3

The yarn was prepared by twisting the knitted yarn with 800 TM and then knitted into a knitted fabric, and was prepared in the same manner as in Example 1 except that the dyeing was performed according to the usual processing conditions.

Example  4

The prepared yarn was twisted into lead-free yarn to be knitted into a knitted fabric, and then manufactured in the same manner as in Example 1 except that the dyeing was performed according to the usual processing conditions.

Comparative example  One

PTT having an intrinsic viscosity of 1.10 dl / g and PET having an intrinsic viscosity of 0.55 dl / g were spun at a spinning speed of 4,000 m / min, resulting in monodenier at a temperature of 70 ° C. for the first high roller and an annealing temperature of 120 ° C. A polyester latent crimped composite filament yarn having a thickness of 3.1 denier and a total denier of 150 denier was prepared.

The yarn, which is a polyester latent crimped composite filament yarn manufactured in the above manner, was twisted with 800TM and used as warp and weft yarns to be woven into plain weave in a waterjet loom, and then subjected to salt processing according to conventional processing conditions.

Physical properties such as elongation rate and elongation recovery rate of dyed fabrics were measured 10 times based on KSK standard and the results are shown in Table 1.

Comparative example  2

Except that the prepared yarn was lead-free was prepared in the same manner as in Comparative Example 1.

Comparative example  3

The prepared yarn was twisted with 800TM to be knitted into a knitted fabric, and then manufactured in the same manner as in Comparative Example 1 except that the dyeing was performed according to the usual processing conditions.

Comparative example  4

After the prepared yarn was twisted into lead-free yarn and knitted into a knit fabric, it was prepared in the same manner as in Comparative Example 1 except that the dyeing was performed according to the usual processing conditions.

Comparative example  5

PTT with an intrinsic viscosity of 1.10 dl / g and PET with an intrinsic viscosity of 0.55 dl / g were spun at a spinning speed of 6,500 m / min, resulting in a polyester latent crimped composite filament with a monodenier of 3.1 denier and a total denier of 150 denier The yarn was prepared.

The yarn, which is a polyester latent crimped composite filament yarn manufactured in the above manner, was twisted with 800TM and used as warp and weft yarns to weave into plain weave in a waterjet loom, and then proceed with salt processing in accordance with normal processing conditions.

Physical properties such as elongation rate and elongation recovery rate of dyed fabrics were measured 10 times based on KSK standard and the results are shown in Table 1.

Comparative example  6

A yarn was prepared in the same manner as in Comparative Example 5 except that the prepared yarn was lead-free.

Comparative example  7

The prepared yarn was twisted with 800TM to be knitted into a knitted fabric, and then manufactured in the same manner as in Comparative Example 5 except that the dyeing was performed according to normal processing conditions.

Comparative example  8

After the prepared yarn was twisted into lead-free yarn and knitted into a knitted fabric, it was prepared in the same manner as in Comparative Example 5 except that the dyeing was performed according to normal processing conditions.

※ Test Methods

(1) measuring strength and elongation at break

The fineness of the yarn was obtained by winding 90m of a 1m skein at a time of rotation and measuring the weight and converting it to 9,000m. The strength and elongation at break of the fibers were measured using an automatic tensile tester (Textechno, Inc.) at a rate of 50 cm / min and a gripping distance of 50 cm.

(2) elastic recovery rate

Measured according to ASTM D 6720, the sample is adjusted by the number of revolutions to obtain a 5000 de sine, and immersed in water at 100 ℃ for 15 minutes to measure L1, L2 as follows.

L1: Measured after applying 30g + 1000g load (stress & relax 3 times)

L2: Measured after 30 seconds of 1000g unloading

Calculation: elastic recovery rate = (L1-L2) / L2 × 100

(3) the maximum stress temperature and the maximum stress value

It measured using the thermal stress measuring apparatus (KE-2: Kanebo Engineering make), cut the fiber into 22 cm, made it into the 10 cm ring, and installed it in the measuring device. The initial load at the time of measurement was measured on 0.067 G / D and the temperature increase rate of 2 degree-C / sec, and the temperature change of thermal stress was described in the chart. From the reading of this peak, the maximum stress temperature and the maximum stress value (G / D) were measured.

(4) LEESONA shrink length

The initial length of the sample should be (20.5 ㆇ 0.0016 ㆇ de ㆇ 2) meter (m), wound around a 1m skein, and connected at both ends to make 50cm initial length, and apply 20.5g super load. Heat-treated for 10 minutes in hot water of ℃ ± 2 ℃ and left for 3 to 5 minutes (until the water drops do not fall) to measure the length.

(5) elongation rate, elongation recovery rate of fabric

The elongation of the fabric was measured 10 times using the method of KSK 0352 5.2.2.

Elongation recovery rate of the fabric was measured 10 times by measuring method of KSK 0541.

(6) tightness and softness

The effect of the fabric on the appearance of the fabric is excellent when 10 or more experts judge that more than 8 people are dense and soft, and when 5 to 7 people think that it is dense and soft, less than 5 people are fine and soft. In case of judgment, it is classified as bad.

TABLE 1

division PTT original
Viscosity
(dl / g) PET original
Viscosity
(dl / g) burglar
(G / D) Breaking Break
(%) Elastic recovery
(%) LEESONA
(cm) Maximum stress value
(G / D) Maximum stress temperature (℃) Fabric elongation rate
(%) Fabric Elongation Recovery
(%) Memorial service Compactness & Softness Example 1 1.1 0.55 3.5 40 40 31 0.35 197 32 97 Great Great Example 2 1.1 0.55 3.5 40 40 31 0.35 197 33 96 Great Great Example 3 1.1 0.55 3.5 39 39 32 0.34 200 32 96 Great Great Example 4 1.1 0.55 3.3 39 39 32 0.34 200 36 95 Great Great Comparative Example 1 1.1 0.55 3.4 46 30 38 0.3 180 25 94 Great usually Comparative Example 2 1.1 0.55 3.0 43 27 40 0.29 183 23 95 Great usually Comparative Example 3 1.1 0.55 3.3 45 31 39 0.33 184 28 93 Great usually Comparative Example 4 1.1 0.55 3.2 44 30 38 0.31 189 30 92 Great usually Comparative Example 5 1.1 0.55 3.3 44 40 33 0.35 200 30 95 Bad usually Comparative Example 6 1.1 0.55 3.2 40 39 32 0.34 197 33 94 Bad Bad Comparative Example 7 1.1 0.55 3.1 42 41 32 0.34 197 32 96 Bad Bad Comparative Example 8 1.1 0.55 3.3 41 38 30 0.33 198 33 95 usually usually

As shown in the results of Table 1, the polyester composite fiber produced in the present invention has a fine and soft touch as well as excellent spinning workability, 39-40% elongation at break, and 39-40% It can be confirmed that the fiber having a new characteristic different from the existing one by exhibiting high elastic properties showing elastic recovery rate, elongation recovery rate of 95 to 97%.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a schematic diagram of a composite spinning apparatus according to a preferred embodiment of the present invention.

Figure 2 is a SEM photograph showing the cross-sectional shape of the high-stretch polyester composite fiber according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

One; Extruder 2; Spinning Pack

3; First roller roller 4; Drawing company (FDY)

5; 2nd Gauze Roller

Claims (10)

A melt forming step of melting polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET), which are heterogeneous polyesters, respectively; and Obtaining the melt as a side-by-side composite fiber stretched yarn (FDY) at a spinning speed of 4,500 to 6,000 m / min; Method for producing a high stretch polyester composite fiber comprising a. The method of claim 1, Method for producing a high-stretch polyester composite fiber having a stretching temperature of 60 to 95 ℃ in the step of obtaining by the stretched yarn (FDY). The method of claim 1, Method for producing a high-stretch polyester composite fiber further comprises the step of heat-treating the stretched yarn (FDY) to 110 ~ 130 ℃ after the step of obtaining the stretched yarn (FDY). The method of claim 1, The intrinsic viscosity (IV) of the polytrimethylene terephthalate is 0.90 to 1.10 dl / g, and the intrinsic viscosity (IV) of the polyethylene terephthalate is 0.50 to 0.65 dl / g. . The method of claim 1, Method for producing a high-stretch polyester composite fiber, characterized in that the content ratio of the polytrimethylene terephthalate and polyethylene terephthalate is 45:55 to 50:50. In the composite fiber in which the polytrimethylene terephthalate (PTT) and the polyethylene terephthalate (PET), which are different kinds of polyesters, are spun in a side-by-side form, (1) the elongation at break is 30% to 45%, (2) the maximum stress value of dry heat shrinkage stress is 0.2 to 0.5 G / D, (3) the dry heat shrinkage maximum stress expression temperature is 180 to 220 ℃, (4) the shrinkage length after measuring LEESONA is 30 to 40 cm, (5) the elastic recovery rate is 35 to 50%, (6) A highly stretched polyester composite fiber, characterized in that the number of entanglement is 5 to 20 / m. The method of claim 6, The composite fiber (7) high stretch polyester composite fiber, characterized in that the stretch recovery rate of 90 to 99%. The method of claim 6, The intrinsic viscosity (IV) of the polytrimethylene terephthalate is 0.90 to 1.10 dl / g, and the intrinsic viscosity (IV) of the polyethylene terephthalate is 0.50 to 0.65 dl / g. The method of claim 6, The high stretch polyester composite fiber, characterized in that the content ratio of the polytrimethylene terephthalate and polyethylene terephthalate is 45:55 to 50:50. A fabric prepared by using the fiber produced by the method of any one of claims 1 to 5 or the fiber of any one of claims 6 to 9 as a warp yarn or a weft yarn using twisted yarn or lead-free.

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