KR20050034235A - Method of preparing polyester fiber having improved elasticity and the polyester fiber thereby - Google Patents

Abstract

The present invention relates to a method for producing a polyester yarn of improved elasticity and a polyester yarn produced thereby. In detail, the method for producing a polyester yarn of the present invention is a polyester yarn component is shear rate ( ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. , To produce a composite fibrous polymer by spinning from the spinneret at a predetermined draft ratio, and to spin and stretch the prepared composite fibrous polymer with a spin draw method or a semi-orientation yarn (POY-DT) To do. In addition, the manufacturing method of the present invention presents the optimum conditions for the conventional manufacturing method, and use the spinning / winding equipment and the stretching equipment as it is, without causing problems of cost increase, crimp elongation 60% or more and elastic recovery 70 It is possible to produce a polyester yarn having excellent elasticity having a% or more. Further, when the polyester-based yarn is applied to the fabric may be made of a fabric having improved elasticity.

Description

Manufacturing method of polyester yarn with improved elasticity and polyester yarn manufactured by the same {METHOD OF PREPARING POLYESTER FIBER HAVING IMPROVED ELASTICITY AND THE POLYESTER FIBER THEREBY}

The present invention relates to a method for producing a polyester-based yarn, a polyester-based yarn produced thereby and a stretchy fabric composed of the yarn.

Polyester is a synthetic material obtained by condensation polymerization of phthalic acid and ethylene glycol, and due to its properties suitable for clothing, polyester fiber is currently used for the most various uses among synthetic fibers, and accounts for 50% of synthetic fiber production. These polyester fibers have low hygroscopicity, so they dry easily after washing, have good elastic recovery, do not have wrinkles, and have good flammability. The heat-fixed coating does not need to be ironed. In addition, there are characteristics such as durability, sun resistance, chemical resistance.

However, polyester fibers have extremely low hygroscopicity, which not only contributes to fouling caused by static electricity and discomfort to the body when worn, but also makes it difficult for moisture in the body to escape to the outside, making it feel muggy in summer and cold in winter. . In particular, by limiting the application range of the polyester-based fibers, there is a disadvantage that the elasticity is poor.

Therefore, efforts are made to steadily compensate for the disadvantages while maintaining the advantages of the polyester as it is, and a typical example is a blend that gives comfort and hygroscopicity of cotton fibers to the high elastic recovery rate and form stability of the polyester. On the other hand, in an effort to impart elasticity to polyester fibers, a method of mixing polyurethane fibers has been attempted.

However, when the polyurethane fiber is mixed, the elasticity is improved, but the touch is hard and the chlorine resistance is weak, and when mixed with the polyester fiber, the dyeing process is not easy, and the dyeing process is complicated, and the dyeing fastness is also disadvantageous.

Therefore, a method for producing stretchable fibers using a polyester polymer, not the polyurethane-based composition, is known. Japanese Patent Laid-Open No. 10-72732 and Japanese Patent Laid-Open No. 9-209217 disclose a method of using two kinds of polyethylene terephthalate (PET) having extreme viscosity differences. In addition, Japanese Patent Application Laid-Open No. 3-161519, Japanese Patent Application Laid-Open No. 2000-328378, and Japanese Patent Application Laid-open No. 9-41234 disclose general polyethylene terephthalate and highly shrinkable copolymerized polyethylene terephthalate. It is known to manufacture polyester-based latent crimpable fibers. In addition, US Pat. No. 3,671,379 and Japanese Patent Laid-Open No. 2000-248430 use polytrimethylene terephthalate (PTT) or polybutylene terephthalate (PBT) having a stretch property to polyethylene terephthalate (PET). It also shows how.

Particularly, according to Korean Patent Laid-Open Publication No. 2001-0049484, a soft stretch yarn is made of a composite component composed of two kinds of polyesters having polytrimethylene terephthalate (PTT) as one component, thereby improving soft stretch properties. In the case of polyurethane-based fiber, it is excellent in elasticity, but it has been proposed to solve the problem of excessive tightening caused by large stretch resistance and fabrication problem of fabric. The soft stretch property refers to a property that stretches comfortably in a state where the tightening feeling of the yarn or fabric is not large, which means that the stress required during stretching is small.

However, polyester fibers, that is, yarns and woven fabrics having the same structure, have not yet secured fiber development technology having a crimp elongation and elastic recovery rate comparable to that of polyurethane fibers.

The general manufacturing process of polyester fiber is melt spinning the polyester to wind the low orientation amorphous non-twisted yarn, and then, in the stretching process, it is oriented, crystallized and post-processed or partially oriented yarn with a spinning speed of 3,000 to 4,000 m / min. (POY) to produce and process it. In recent years, the manufacturing process has been made in two stages, and the problem of higher equipment investment cost and lower production speed has been pointed out, and the spin draw (SPIN DRAW) spinning drawing method directly flames the POY having structural stability. It is becoming. In the spin draw spinning method, the polyester fiber is spun at a constant speed to maintain the temperature at or above the glass transition temperature to continuously manufacture the polyester fiber in one step through the first and second goth rollers.

Therefore, in order to obtain a polyester-based fiber that gives elasticity, it is necessary to select an appropriate composition and ratio thereof that can impart elasticity to the fiber, spinning temperature, spinning speed, first goth roller and second goth roller in the manufacturing process. Depending on the temperature and speed of the physical properties of the final polyester-based yarn also varies. As an example, Korean Patent Publication No. 0315150 cold-stretches the fiber spun through spinnerets with a first goth roller without heating, and heat-treats it in a heated second goth roller to give thermal stability. , Polyester fibers having a physical property suitable for clothing by performing at a high spinning speed of 5,000 m / min or more.

Accordingly, the present inventors have tried to obtain a polyester fiber having excellent soft stretch property and excellent crimp elongation and elastic recovery rate. As a result, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) as a raw material have a predetermined ratio. By spinning and stretching the conventional spin draw (SPIN DRAW) method or the method of spinning / winding the yarn after the spinning / winding (POY-DT) under optimum conditions, the polyester-based yarn is stretched in addition to the soft stretch The present invention was completed by confirming that the properties of the crimp elongation and the elastic recovery rate, which exhibit the properties, are excellent in elongation and elongation recovery rate when applied to the fabric.

An object of the present invention is to provide a method for producing a stretch-based polyester yarn having a crimp elongation of 60% or more and an elastic recovery rate of 70% or more.

Another object of the present invention is to provide a polyester-based stretch yarn and a fabric made of the yarn produced by the method of producing a polyester yarn of improved elasticity of the present invention.

In order to achieve the above object, the present invention provides a polyester yarn component in order to give elasticity to the polyester yarn, the shear rate ( ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. , To produce a composite fibrous polymer by spinning from the spinneret at a predetermined draft ratio, and to spin and stretch the prepared composite fibrous polymer with a spin draw method or a semi-orientation yarn (POY-DT) It is characterized by performing.

Accordingly, in the first preferred embodiment, the polyester yarn component is shear rate ( ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. , The polyester-based elasticity improved by spinning the spinneret at a predetermined draft ratio to produce a composite fibrous polymer, and winding the composite fibrous polymer prepared by passing through the first godetrol and the second godetrol continuously It provides a method for producing yarn.

Moreover, as a 2nd preferable embodiment, a polyester yarn component is a shear rate ( ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. To produce a composite fibrous polymer by spinning from the spinneret at a predetermined draft ratio, and to wind the composite fibrous polymer prepared by passing through the first high and second deodetro continuously and to prepare a polyester-based anti-orientation yarn, Provided is a method for producing a polyester yarn, characterized in that the prepared semi-oriented yarn is drawn with a hot roller of 60 to 90 ℃ and a hot plate of 120 to 180 ℃, and then wound by passing through a cold roller.

In addition, the present invention provides a woven fabric consisting of a polyester-based yarn having a crimp elongation of at least 60% and an elastic recovery rate of at least 70% and a spring-shaped crimp is provided by the manufacturing method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In the method for producing a polyester-based yarn having improved elasticity of the present invention, in order to provide elasticity to the yarn, selection of a composition is important. Thus, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) used in the present invention is a constant shear rate ( Maintaining a constant melt viscosity difference (ΔMV) at is preferred for the stretch properties and spinning processability of yarns and fabrics. Therefore, the polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) of the present invention is a shear rate (285 ℃ to 290 ℃ temperature) ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) of the polymer is 4,000 to 75,000 Pa · S.

Also, generally The value of ΔMV _ET means the difference in flowability of each polymer during spinning, and the value is preferably 1.2 × 10 ⁷ Pa · S / sec to 7.5 × 10 ⁷ Pa · S / sec, × △ MV _ET value is 1.2 × 10 ⁷ when Pa. S / sec or less, it is difficult to expect high stretch characteristics of the crimp elongation and the elastic recovery ratio, 7.5 × 10 ⁷ when Pa. S / sec or more of sacrifice lowered and yarn Castle Problems such as mourning may occur in appearance.

However, if the moisture content between the polymers is kept constant in the spinning process and the spinning temperature is properly maintained to minimize thermal decomposition of the polymer, the shear rate ( ) And the difference in melt viscosity (ΔMV _ET ) are directly related to the yarn properties.

The mixing ratio of the polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) is a polytrimethylene terephthalate (PTT) is 30% to 70% by weight with respect to the polyethylene terephthalate (PET), More preferably, 40 wt% to 60 wt% of polytrimethylene terephthalate (PTT) is mixed. At this time, when the polytrimethylene terephthalate (PTT) is 30% by weight or less or 70% by weight or more, the elasticity, strength, elongation, desabilitation, etc. of the yarn decreases, which is not suitable for problems such as appearance appearance.

The melting temperature of the polymer is preferably 275 to 300 ° C for polyethylene terephthalate (PET) and 250 to 300 ° C for polytrimethylene terephthalate (PTT), and the spinning temperature through the discharge hole is about 250 to 300 ° C. Although possible, considering the spin processability and the thermal decomposition problem of polytrimethylene terephthalate (PTT), preferably in the range of 260 to 290 ° C.

Referring to the first embodiment of the present invention in detail with reference to the drawings, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) are each melted and spun through the spinneret 1 at a predetermined draft ratio, Composite fibrous polymers are prepared. Then, the manufactured thread 2 is cooled by the cooling device 3, lubricated by the oil supply device 4, taken out and preheated by the first high detro controller 5, and then the second high controller 6 It is heat set at and is then wound in a winding roller (8). Thereby, the stretched yarn is manufactured by one step of the spin draw process. If necessary, the air nozzle 7 is provided between the second gode controller 6 and the take-up roller 8 to impart entanglement ( FIG. 1 ).

The spinneret (1) is a passage through which the polymer melted in the composition is spun after mixing, the cross section of the yarn produced through the spinneret of the present invention is shown in Figure 3a to 3c , the length of the long axis of the cross-section ( The ratio (a / b) of the length (b) of the short axis to a) is made into an oval or peanut shape with a 1.2 to 3.0. Therefore, the spinneret of the present invention can prevent a severe curvature phenomenon occurring when the polymer is spun from the spinneret when the difference in melt viscosity between polymers is large. The shape of the yarn cross section obtained at this time depends on the mixed composition ratio, melt viscosity difference, spinning conditions and the like of the polymer used.

The draft ratio is preferably performed at 250 or less each of polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT). When the draft ratio is greater than 250, it may cause deterioration of the sacrificial properties and reduction of the crimp elongation and elastic recovery rate, which are elastic properties.

The "draft ratio" is a value according to Equation 1 below, and the higher the draft ratio, the lower the radial polymer flow rate relative to the spinning speed. The draft ratio may cause nonuniformity of cross-sectional formation, lowering of strength and elongation, and deterioration of sacrificiality, especially when a yarn having a deformed cross section is spinning at a certain level or more according to the spinning method.

(V ₁ = speed of the first Godet roller,

V ₀ = discharge amount / (number of nozzle holes x cross-sectional area of each hole x melt density of the polymer).

The cooling device 3 performs cooling of the discharged yarn 2 at a cold wind speed of 0.4 to 0.5 m / sec at a cold wind temperature of 20 ° C.

In addition, the first gode controller 5 is preferably performed at a speed of 600 to 1,200 m / min at a temperature of 60 to 90 ° C., and the second gode controller 6 is performed at a speed of 2,000 to 4,500 m / min at a temperature of 120 to 180 ° C. Do. In particular, the temperature of the second gode controller (6) is a factor related to the heat setting of the fiber, and the polymer used in the single yarn fineness because it is directly related to the stretch characteristics, thermal stress, temperature at the maximum thermal stress, shrinkage rate, etc. It is important to set the appropriate conditions according to the type and type. If necessary, an air nozzle 7 may be attached between the second gode controller 6 and the take-up roller 8 to impart entanglement.

Referring to the second embodiment of the present invention in detail with reference to the drawings, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) are each melted and spun through the spinneret 1 at a predetermined draft ratio, Composite fibrous polymers are prepared. The manufactured yarn 2 is cooled by the cooling device 3, lubricated by the lubrication guide 9, and is continuously made through a polyester-based half through the first gode controller 5 and the second gode controller 6. A perfume (partially oriented yarn) is produced and wound in a winding roller 8 ( FIG. 2A ).

In the above process, the cooling apparatus 3 cools the discharged yarn 2 at a cold wind speed of 0.4 to 0.5 m / sec at a cold wind temperature of 20 ° C.

In addition, the first gode controller 5 and the second gode controller 6 is carried out at a speed of 1,500 to 3,200 m / min at room temperature without additional heat.

The draft ratio is preferably performed in each of polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT) of 500 or less. At this time, when the draft ratio exceeds 500, it is possible to cause a decrease in the weaving property and a reduction in the crimp elongation and elastic recovery rate, which are elastic properties.

Figure 2b is a process of stretching the prepared semi-orientation yarn using a separate stretching device. In detail, the fiber skew 10 wound on the prepared semi-orientation yarn passes through the guide 17 and passes through a hot roller 12 at 60 to 90 ° C., and passes through a hot plate 13 at 120 to 180 ° C. It is stretched and heat set in the process. Thereafter, the stretched yarn 15 can be obtained by winding the yarn which has passed through the hot plate 13 through the cold roller 14. The hot plate 13 can be used both contact and non-contact. In addition, if necessary, an air nozzle may be attached between the cold roller and the wound fiber skein to provide entanglement.

At this time, the stretching ratio is preferably 1.4 to 2.0 level in the stretching process, the stretching speed is preferably performed at 500 to 900 m / min.

The present invention provides a polyester-based yarn having improved elasticity produced by the method for producing the polyester-based fiber. That is, the polyester-based yarn of the present invention provides a form in which elasticity is improved to a crimp elongation of 60% or more and an elastic recovery rate of 70% or more, and a spring-shaped crimp is provided. Crimp generally means crimp and can be expressed as in Equation 2 in the present patent.

Figures 3a to 3c is a cross-sectional view of the polyester yarn produced by the manufacturing method of the present invention, the ratio (a / b) of the length (b) of the short axis to the length (a) of the yarn long axis is 1.2 to 3.0 It is made into oval or peanut form.

Further, the final single yarn fineness of the produced polyester yarn is 1 to 4 deniers, more preferably 2 to 3 deniers.

Further, the polyester-based yarn with improved elasticity of the present invention can be produced in a woven or knitted fabric according to a conventional method.

Hereinafter, the present invention will be described in more detail with reference to Examples.

This embodiment is intended to describe in detail using the most preferred embodiment of the present invention to the extent that those skilled in the art can easily carry out the technical idea of the present invention, The range is not limited to these examples.

1. Preparation of Polyester-based Yarn Using First Embodiment

<Example 1>

Shear rate ) Polyethylene terephthalate (PET) having a melt viscosity of 349 Pa.S and polytrimethylene terephthalate (PTT) having a melt viscosity of 5,921 Pa.S at 2,330 / sec. Spinneret spun into a composite fiber at 285 ℃. The melt viscosity difference (ΔMV _ET ) between the polymers is 5,572 Pa · S, The value of × ΔMV _ET is 1.30 × 10 ⁷ Pa · S / sec. The yarn 2 emitted by the spinning direct drawing apparatus of FIG. 1 was cooled at a cold wind temperature of 20 ° C. and a cold wind speed of 0.45 m / sec. After cooling, the oil is fed from the oil supply unit 4, and the stretching is performed by setting the temperatures of the first and second gode controllers 5 and 6 to 80 ° C and 140 ° C, respectively, and setting the spinning speed to 3,900 m / min. Was completed. After imparting 1.0 KP of entanglement by the air nozzle 7 between the second gode controller 6 and the winding roller 8, the spring-shaped crimp is produced using the winding roller 8, , A polyester yarn having a final single yarn fineness of 2.1 denier was prepared.

<Example 2>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (ΔMV _ET ) of 10,318 Pa.S at 1,853 / sec and spinning speed of 3,100 m / min, In the same manner as in Example 1, a spring-shaped crimp was produced to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

<Example 3>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (ΔMV _ET ) of 9,721 Pa.S between polymers at 2,271 / sec and spinning rate of 3,800 m / min, In the same manner as in Example 1, a spring-shaped crimp was produced to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

<Example 4>

Shear rate ), Except that polyethylene terephthalate and polytrimethylene terephthalate having a difference in melt viscosity (ΔMV _ET ) between polymers at 1,793 / sec were used at 16,001 Pa · S and spinning rate was performed at 3,000 m / min. In the same manner as in Example 1, a spring-shaped crimp was produced to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

Example 5

Shear rate ) Except for using polyethylene terephthalate and polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 20,385 Pa · S at 1,733 / sec and spinning speed of 2,900 m / min, In the same manner as in Example 1, a spring-shaped crimp was produced to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

<Example 6>

Shear rate ) Polyethylene terephthalate and polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 30,382 Pa · S at 1,344 / sec and a temperature of the first gode controller 5 at 85 ° C., the second gode Except that the temperature of the controller 6 is 150 ℃, spinning speed 2,250 m / min, the same manner as in Example 1 to produce a spring-shaped crimp, polyester yarn having a final single yarn fineness of 2.1 denier Was prepared.

<Example 7>

Shear rate ) Polyethylene terephthalate and polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 45,486 Pa · S at 1,196 / sec and a spinning temperature of 290 ° C. and the temperature of the first gode controller 5 at 85 ° C. , And except that the temperature of the second gode controller 6 is 150 ° C., the spinning speed is 2,000 m / min, a spring-shaped crimp is produced in the same manner as in Example 1, and the final single yarn fineness is 2.1 denier. Phosphorous polyester yarn was prepared.

2. Preparation of Polyester-based Yarn Using Second Embodiment

<Example 8>

Step 1: Prepare anti-orientation yarn

Shear rate ) Polyethylene terephthalate (PET) with a melt viscosity of 339 Pa.S and polytrimethylene terephthalate (PTT) with a melt viscosity of 5,746 Pa.S at 2,582 / sec. Spun into a composite fiber at 285 ℃. The melt viscosity difference (ΔMV _ET ) between the polymers is 5,407 Pa · S, The value of × ΔMV _ET is 1.40 × 10 ⁷ Pa · S / sec. Using the spinning / winding device of Figure 2a was carried out at a spinning speed of 2,700 m / min to discharge the yarn 2 was cooled to a cold wind temperature of 20 ℃, cold wind speed of 0.45 m / sec. After cooling, it is lubricated by the lubrication guide (9), passed through the first gode controller (5) and the second gode controller (6) maintained at room temperature and wound around the winding roller (8) polyester fiber having a single yarn fineness of 3.4 denier Semi-orientated yarn (POY) was prepared.

Step 2: drawing process of the prepared anti-orientator

The anti-orientation yarn obtained by spinning / winding was stretched using a separate stretching apparatus of FIG. 3B. At this time, the draw ratio is 1.65 and the draw speed is 760 m / min. The stretching process is carried out through the cold roller (14) after the thread from the fiber skein (10) through the guide 11 through the hot roller 12 of 80 ℃, hot plate 13 of 150 ℃ continuously It was obtained as a gentleman (15), and a single yarn fineness with a spring-shaped crimp was also applied by applying an air nozzle between the cold roller 14 and the coiled fiber skein using 1.0 KP of air pressure. System yarns were prepared.

Example 9

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 8,197 Pa · S at 2,104 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 2,200 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Thereafter, except that the anti-orientation yarn obtained by spinning / winding was set to a draw ratio of 1.74 and a drawing speed of 760 m / min, the single yarn fineness 2.1 denier was applied in the same manner as in Step 2 of Example 8 to give a spring-shaped crimp. A grade polyester yarn was prepared.

<Example 10>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 9,575 Pa · S at 2,391 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 2,500 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Thereafter, except that the semi-orientation yarn obtained by spinning / winding was set to a draw ratio of 1.58 and a drawing speed of 760 m / min, the single yarn fineness 2.1 denier was applied in the same manner as in Step 2 of Example 8 to give a crimp of a spring shape. A grade polyester yarn was prepared.

<Example 11>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 15,268 Pa · S at 2,104 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 2,200 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Thereafter, except that the semi-orientation yarn obtained by spinning / winding was set to a draw ratio of 1.58 and a drawing speed of 760 m / min. A grade polyester yarn was prepared.

<Example 12>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 19,805 Pa.S at 1,912 / sec and spinning at a spinning temperature of 285 ° C and a spinning rate of 2,000 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Thereafter, except that the semi-orientation yarn obtained by spinning / winding was set to a draw ratio of 1.52 and a drawing speed of 760 m / min. A grade polyester yarn was prepared.

Example 13

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 28,262 Pa · S at 1,720 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 1,800 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Subsequently, the semi-orientated yarn obtained by spinning / winding was set to a draw ratio of 1.49 and a drawing speed of 760 m / min, except that the hot roller 12 at 85 ° C. and the hot plate 13 at 160 ° C. were used. In the same manner as in Step 2 of Example 8, a single yarn fineness 2.1 denier-type polyester yarn with a spring-shaped crimp was prepared.

<Example 14>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 42,485 Pa · S at 1,532 / sec and spinning at a spinning temperature of 290 ° C and a spinning speed of 1,600 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Subsequently, the semi-orientation yarn obtained by spinning / winding was set at a draw ratio of 1.45 and a drawing speed of 760 m / min, except that the hot roller 12 at 85 ° C. and the hot plate 13 at 160 ° C. were used. In the same manner as in Step 2 of Example 8, a 2.1-denier polyester yarn was also manufactured in which single yarn fineness to which a spring-shaped crimp was applied.

Comparative Example 1

Shear rate ) Using a polyethylene terephthalate and a polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 2,710 Pa · S at 2,392 / sec and setting the spinning speed of the second gode controller 6 at 4,000 m / min. Except for the above, the same procedure as in Example 1 was carried out to produce a spring-shaped crimp and to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

Comparative Example 2

Shear rate ) Except for using polyethylene terephthalate and polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 2,107 Pa · S at 2,330 / sec and setting the temperature of the second gode controller 6 to 150 ° C. Then, it carried out similarly to Example 1, the spring-shaped crimp was produced | generated, and the polyester yarn of final denier fineness of 2.1 denier was manufactured.

Comparative Example 3

Shear rate ) Polyethylene terephthalate and polytrimethylene terephthalate having a melt viscosity difference (ΔMV _ET ) of 939 Pa.S at 2,335 / sec and a spinning temperature of 290 ° C and a temperature of the second gode controller 6 at 150 ° C. Except that it was set to, in the same manner as in Example 1 to produce a spring-shaped crimp, to prepare a polyester yarn having a final single yarn fineness of 2.1 denier.

<Comparative Example 4>

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 2,710 Pa · S at 2,391 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 2,500 m / min Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Thereafter, the semi-orientated yarn obtained by spinning / winding was carried out in the same manner as in Step 2 of Example 8, except that the anti-orientation yarn was set to a draw ratio of 1.74 and a drawing speed of 760 m / min, to give a spring-shaped crimp. Was prepared.

Comparative Example 5

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 2,023 Pa.S at 2,677 / sec and spinning at a spinning temperature of 285 ° C and a spinning speed of 2,800 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Subsequently, the semi-orientated yarn obtained by spinning / winding was set to a draw ratio of 1.65 and a drawing speed of 760 m / min, except for setting the hot roller 12 at 80 ° C. and the hot plate 13 at 160 ° C. In the same manner as in Step 2 of Example 8, a 2.1-denier polyester yarn was also manufactured in which single yarn fineness to which a spring-shaped crimp was applied.

Comparative Example 6

Shear rate ) Except for the use of polyethylene terephthalate and polytrimethylene terephthalate with a difference in melt viscosity (△ MV _ET ) of 753 Pa.S at 2,682 / sec and spinning at a spinning temperature of 290 ° C and a spinning speed of 2,800 m / min. Was carried out in the same manner as in Step 1 of Example 8 to prepare a semi-oriented yarn (POY) of the polyester fiber so that the single yarn fineness is 3.4 denier.

Subsequently, the semi-orientated yarn obtained by spinning / winding was set to a draw ratio of 1.59 and a drawing speed of 760 m / min, except for setting the hot roller 12 at 80 ° C. and the hot plate 13 at 160 ° C. In the same manner as in Step 2 of Example 8, a 2.1-denier polyester yarn was also manufactured in which single yarn fineness to which a spring-shaped crimp was applied.

Experimental Example Measurement of Polyester Yarn Properties

1. Measurement of crimp elongation and elastic recovery

It was performed as follows to measure the crimp elongation and elastic recovery rate of physical properties of the polyester-based yarn prepared in the above example.

The fiber skein was immersed in boiling water for 30 minutes under no load, and then dried at room temperature, subjected to 0.1 g / d load for 2 minutes, and left for 10 minutes. After leaving the sample subjected to the above step for 2 minutes under a 0.002 g / d load, the length (L ₁ ) at that time was measured. 0.1 g / d load was added to the sample and the length (L ₂ ) was measured after 2 minutes. Furthermore, after removing the 0.1 g / d load, the length (L ₃ ) at that time was measured after 2 minutes. The crimp elongation or elastic recovery was calculated by the following equation (2) or (3).

2. Measurement of elongation and recovery rate of fabric

For fabrics made of polyester yarns prepared in the above examples, elongation was measured based on JIS L 1096 B method (static load method) and elongation recovery rate based on JIS L 1096 B-1 method (static load method). Was measured.

Table 3 and Table 4 show the measurement results of the physical properties of the polyester yarns prepared according to the first embodiment and the second embodiment and the fabrics having the same.

Measurement of physical properties of polyester yarns and fabrics using the first embodiment division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Comparative Example 2 Comparative Example 3 Yarn Crimping rate (%) 63 67 66 68 64 63 61 54 42 25 Elastic recovery rate (%) 81 81 82 80 84 85 87 80 78 77 textile Elongation (%) 30 34 31 33 31 30 28 24 17 12 % Recovery 94 95 96 95 97 96 98 86 88 90

As shown in Table 3, the polyester-based yarn prepared in Examples 1 to 7 is shear rate ( ) 1,000 To 3,000 / sec, melted polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) having a difference in melt viscosity (ΔMV _ET ) of 4,000 to 50,000 Pa · S and spun into a composite fiber, but the spin draw It was manufactured by the (SPIN DRAW) method, and the crimp elongation of the yarn was 60% or more, up to 68%, and the elastic recovery rate was 80% or more. In addition, when the polyester-based yarn is applied to the fabric showed a relatively high elongation of more than 30%, and exhibited excellent physical properties of more than 95% recovery.

On the other hand, in the range of the same shear rate, the comparison prepared by the SPIN DRAW method by melting the mixed composition consisting of polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) having a small difference in melt viscosity between polymers In Examples 1 to 3, no crimp formation of the yarn was observed or very irregular, and the stretch characteristics of the yarn and the fabric were greatly reduced.

Measurement of Physical Properties of Polyester-Based Yarn Using Second Embodiment division Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Comparative Example 4 Comparative Example 5 Comparative Example 6 Yarn Crimping rate (%) 65 68 66 68 65 62 60 51 38 15 Elastic recovery rate (%) 80 79 81 79 82 83 88 80 78 82 textile Elongation (%) 33 36 34 33 31 30 29 22 15 9 % Recovery 92 95 96 96 97 97 98 85 87 89

As shown in Table 4, the polyester-based yarn prepared in Examples 8 to 14 is shear rate ( ) 1,000 To 3,000 / sec, melted polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) having a difference in melt viscosity (ΔMV _ET ) of 4,000 to 45,000 Pa · S to spin the semi-orientated yarn (POY). It was manufactured by the method of stretching after winding (POY-DT), and showed a crimp elongation of at least 60% and an elastic recovery rate of at least 79%. In addition, when the polyester-based yarn is applied to the fabric also showed an elongation of more than 30%, recovery of more than 90%.

On the other hand, within the same shear rate range, Comparative Examples 4 to 6 made of polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) having a difference in melt viscosity between polymers of about 500 to 3,000 Pa · S are yarns. Crimp formation was not observed or very irregular, and the stretch properties of the yarn and fabric were significantly reduced. The smaller the difference in melt viscosity between the polymers, the less the shrinkage properties.

As described above, the present invention

First, the manufacturing method of the present invention has suggested the optimum conditions for the conventional manufacturing method, and does not cause a problem of cost increase because it is carried out using the spinning / winding equipment and the stretching equipment as it is,

Secondly, a polyester-based yarn having excellent elasticity having a crimp elongation of at least 60% and an elastic recovery rate of at least 70% was prepared by the method of the present invention;

Second, when the polyester yarn prepared by the production method of the present invention is applied to the fabric, it was possible to provide a fabric excellent in elongation and recovery rate.

1 is a schematic diagram showing a step of directly stretching after spinning as a first embodiment of the present invention;

It is a schematic diagram which shows the spinning / winding apparatus in 2nd Embodiment of this invention,

It is a schematic diagram which shows the drawing apparatus in 2nd Embodiment of this invention,

Figure 3 is an enlarged cross-sectional model of the polyester yarn produced by the manufacturing method of the present invention.

a: long axis length of section, b: short axis length of section

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

1: spinneret 2: thread

3: cooling zone 4: lubrication roller

5: 1st Godetroller 6: 2nd Godetroller

7: Air Nozzle 8: Winding Roller

9: Refueling Guide 10: Textile Thread

11: Guide 12: Hot Roller (HR)

13: Hot plate (HP) 14: Cold roller (CR)

15: drawing company

Claims (12)

Shear rate of polyester yarn ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. A polyester system comprising: spinning a spinneret at a predetermined draft ratio to produce a composite fibrous polymer, and winding the composite fibrous polymer continuously through the first and second high-detro controllers, followed by winding. Method of making yarn. The polyester yarn of claim 1, wherein the polyester yarn component comprises 30 wt% to 70 wt% of polytrimethylene terephthalate (PTT) based on polyethylene terephthalate (PET). Manufacturing method. The method of claim 1, wherein the draft ratio is polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT) of 250 or less, respectively. The method of claim 1, wherein the first godetroller is performed at a speed of 600 to 1,200 m / min at 60 ~ 90 ℃, the second godeotrol is performed at a speed of 2,000 ~ 4,500 m / min at 120 ~ 180 ℃ The manufacturing method of the said polyester yarn. Shear rate of polyester yarn ) 1,000 To 3,000 / sec, the difference in melt viscosity (ΔMV _ET ) is polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) in the range of 4,000 to 75,000 Pa.S. To produce a composite fibrous polymer by spinning from the spinneret at a predetermined draft ratio, and to prepare a polyester-based anti-orientation yarn (POY) by winding the composite fibrous polymer through the first high and second deodetro continuously after winding And stretching the prepared semi-orientated yarn into a hot roller at 60 to 90 ° C. and a hot plate at 120 to 180 ° C., and then winding it through a cold roller to produce a polyester yarn. The polyester yarn of claim 5, wherein the polyester yarn component comprises 30 wt% to 70 wt% of polytrimethylene terephthalate (PTT) based on polyethylene terephthalate (PET). Manufacturing method. The method of claim 5, wherein the draft ratio is polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT) 500 or less, respectively. The method of claim 5, wherein the first godetrol and the second godetrol is a method of producing the polyester yarn, characterized in that carried out at 1,500 to 3,200 m / min at room temperature. A polyester-based yarn having a crimp elongation of at least 60% and an elastic recovery rate of at least 70%, produced by the method of any one of claims 1 to 5. 10. The polyester yarn according to claim 9, wherein the polyester yarn has an elliptical or peanut-shaped cross section having a length ratio of a long axis to a short axis (a / b) of 1.2 to 3.0.  10. The polyester yarn according to claim 9, wherein the polyester yarn is a single yarn fineness of 1 to 4 deniers. The polyester-based fabric improved elasticity, characterized in that the polyester yarn of claim 9.