KR20040049722A - Method for manufacturing polyester fine dinier multifilaments and the multifilaments manufactured from the same - Google Patents

Abstract

PURPOSE: Plural fine denier polyester pre-drawn yarn is characterized by having 0.3-2.0denier of single yarn fineness, 100-160% of rupture elongation, under 0.3 of long-period variation of uster, under 2% of thermal stress variation and having excellent dyeability. A manufacturing method thereof is provided. CONSTITUTION: Plural fine denier polyester pre-drawn yarn is obtained by the steps of: preparing a polyester polymer having 0.5-0.7 of inherent viscosity and 245-265deg.C of melting point; heat-melting and filtering the polyester; (a) extruding the polyester through multi-ring type discharge holes of a spinning nozzle(3) to discharge tow(4) uniformly (D2 is diameter of the external ring and D1 is diameter of the internal ring); (b) passing the tow(4) through Ls(mm) of a calm zone set on a lower part of the spinning nozzle(3); passing the tow through a cylindrical cooling drum(5) having Do(mm) of diameter and Lq(cm) of length; supplying a cooling wind about the tow at 0.2-0.6m/s of speed to cool the tow until under glass transition temperature of the polyester polymer and to collect the tow; and then (d) winding the tow at 1800-3000m/min. of speed. D2, D1, Do, Ls and Lq satisfy formulae (i) D2-D1<=20(mm), (ii) 12<=D1-D0<=33(mm), (iii) 2<=Ls<=20(mm) and (iv) 15<=Lq<=40(cm). Density of the discharge holes of the spinning nozzle is 7-21 numbers per 1cm¬2. Drawn yarn is obtained by false-twist finishing, draw-twist finishing, air-texture finishing and direct spinning-drawing finishing the pre-drawn polyester yarn.

Description

METHOD FOR MANUFACTURING POLYESTER FINE DINIER MULTIFILAMENTS AND THE MULTIFILAMENTS MANUFACTURED FROM THE SAME}

An object of the present invention is to provide a manufacturing method for obtaining a plurality of fine denier polyester stretch yarns having excellent knit dyeing properties, and a plurality of fine denier polyester filaments.

The present invention relates to a method for producing a plurality of fine denier polyester filaments, and more particularly to a method for producing a plurality of fine denier polyester predrawn yarns and to a plurality of fine denier polyester predrawn yarns produced by the method. .

Polyester fiber is the most widely used among the three synthetic fibers because of its excellent processability, knit dyeing and low cost. In recent years, along with the advancement of the quality of fabric materials, the demand for the feel and functionality of the fabrics has increased and the denier (dp f) of short fibers obtained by the melt spinning method has become denier synthetic fibers and hair products thereof. Although it is widely used as a cloth material, in the manufacturing process, the cooling action after the melt discharging to the tow of the polyester has a great influence on the properties and uniformity of the yarn.

Currently widely used cooling methods include cross flow quenching systems (see FIG. 1), radial out-to-in flow quenching systems (see FIG. 2), radial outwards. There is a radial in-to-out flow quenching system (see Figure 3). In the transverse blowing system, after the tow 4 is discharged from the spinneret 3, the tow 4 is cooled on one side of the chamber with cooling wind.

The radial inward blowing system cools the tow by blowing cooling air from the outside along the circumference along the circumference when the tow 4 is discharged from the spinneret 3 and passes through the inside of the cooling tube.

The radial outward blowing system cools the tow by cooling air blowing outward along the circumference when the tow 4 is discharged from the spinneret 3 and passes through the outside of the cooling tube.

Of the three methods, the transverse cooling system is the most widely used, and the radial inward blowing system and the radial outward blowing system are widely used for staple filament and some industrial production.

The production of high-density fabrics and fabrics that are flexible, breathable, waterproof, and lint-free using a plurality of fine denier yarns of polyester has no effect unless the denier (dp f) of short fibers is less than 0.3den. It does not appear clearly. The manufacturing method of denier (dp f) of short fibers, which has been adopted in the market up to now, is 0.3den or less, which is a spinning method of melt-combining two components, that is, a high-fiber fiber in advance and then mechanically or chemically split ( By splitting, a method of producing ultrafine fibers having a denier (dp f) of 0.3 fibers or less was used.

However, in order to spin the two components in combination, a high-cost tow is first produced and a high-cost and expensive equipment is needed to process the tow again. Splitting was not ideal because the process was cumbersome and quality control was difficult.

In addition, in the present melt spinning method of lowering the denier (dp f) of short fibers using a single component polymer, a method of increasing the ejection number of the spinneret after fixing the total discharge amount of the polyester melt and the ejection number of the spinneret There is a method to reduce the total discharge amount of the polyester melt as it is. However, as the electron denier (dp f) becomes shorter in the spinning stage, the discharge air of the spinnerets increases, and when cooled by the cooling device of the cross-winding system, the electrons are only winded on one side of the tow. Cooling difference between close toe and distant toe is extremely large and it is impossible to cool the toe uniformly, and the difference of physical properties between each short fiber is big, resulting in poor uniformity and denier (dp f) of 0.3 fiber. At that time, the difference becomes more apparent and cannot provide a preliminary stretch yarn corresponding to the evaluation as a product. In addition, the latter reduces the total discharge amount of the polyester melt while leaving the ejection air of the spinneret intact, but this method increases the deterioration of the polyester melt due to the increase of the rectification time in the melt pipe of the polyester melt. Low polymers are produced in large quantities, resulting in extremely poor radiation conditions.

In order to produce a standard with high total fineness, it is necessary to produce by combining two plies, and not only is it easy to reduce the yield, but also during the dyeing of post-processing due to the difference in the properties of two plies and tows. Problems such as staining (unevenness) were likely to occur.

The radial inward blowing system is difficult to control the cooling wind, and if the wind speed is too slow, the tow cannot be cooled sufficiently, the Uster's long half inert value increases, and one thread and the thread stick to each other, so that the desired radiation If the wind speed is too fast, the cooling winds in the opposite direction of the blowing direction interfere with each other and the tow becomes unstable, and one thread and the thread collide with each other, which lowers the productivity and makes it difficult for the tow to enter the cooling tube. Difficulties arise in the production of pre-drawn yarns of a plurality of polyester deniers.

Therefore, the urgent solution to the polyester synthetic fiber industry is how to manufacture a plurality of fine denier pre-drawn yarns of high quality polyester which can stably produce while lowering the denier (dp f) of short fibers without affecting productivity. It was a task.

U.S. Pat.Nos. 5,288,553, 5,145,623, 5,407,621, 5,250,245 and the like use polyester chips having a special range of melt viscosity, and also select the diameter of the spinneret and the length of the hole, and also the pipe of the polyester melt. By limiting the spinning conditions such as the stagnation time, a plurality of fine denier pre-drawn yarns of polyester having a fineness of 0.2 to 0.8 denier are produced. However, the electric patent does not explain what cooling method is used, and since the length of the wind-free zone is long from 2 cm to (12x [short fiber denier] ¹ / ²) cm, the spinneret per unit area is In the case where the number of discharge times is increased, the desired condition that the long period variation of the Euster is 0.3% or less and the thermal stress variation is 2% or less cannot be achieved.

In addition, Japanese Patent Application Laid-Open No. 55-132708 discloses a method for producing a stretch yarn having a denier (dp f) of short fibers of polyester, polyamide, and polyol pin of 0.3den or less, and the method includes At the time of discharge, the viscosity is 950poise and maintains the ambient temperature of 1 ~ 3cm below the spinneret to 200 ℃ or less, and the cooling air cools the tow upwards from 5 ° to 85 ° horizontally within 10cm below the spinneret. In this way, the surface of the projection is easily influenced by the cooling wind, resulting in uneven temperature, so that stable spinning is not achieved.

Regarding the radial outward blowing system, U.S. Patent No. 5,536,157 and U.S. Patent No. 5,866,055 disclose methods used for the production of polyester industrial yarns of denier 1.1 to 22.2 den of short fibers, but a plurality of fine denier preliminary of polyester It does not mention the manufacturing method for producing the drawn yarn.

1 is a view showing a plurality of thin denier polyester pre-drawn yarn produced by a conventional transverse air cooling system

Figure 2 is a view showing a plurality of thin denier polyester pre-drawn yarn produced by a conventional radial inward blowing system

Figure 3 is a view showing a plurality of thin denier polyester pre-drawn yarn produced by the radial outward blowing system according to the present invention

4 is a view showing a cooling cylinder in the radial outward blowing system according to the present invention;

5 is a view showing an arrangement method of discharge holes of the spinneret for use in the radial outward blowing system according to the present invention;

Figure 6 is a diagram showing a stretch for twist according to the present invention

7 is a diagram showing direct radiation stretching of a plurality of thin denier polyester stretch yarns produced by a radial outward cooling system according to the present invention;

(Explanation of symbols for the main parts of the drawing)

DESCRIPTION OF SYMBOLS 1 Polyester melt 2 Spinning head 3 Spinning process

33: discharge port 4: tow 5: blower (cooling cylinder)

6: oil nozzle 7: tow after focusing 8: non-heating roller

8-1: heating roller 8-2: heating roller 8-3: separation foil

9: Winding machine 10: Pre-stretched cake 11: Heating roller

12 heater 13 heating roller 14 filament

In the use of the cooling system of the electric cross-winding system, the tow cannot be uniformly cooled because the cooling difference between the tow close to the wind-driven side and the tow far from the wind-driven side is large.

In view of the problems that the property difference between each single fiber is large, the uniformity is inferior, or that the radial directional ventilation system is not operable and the wind speed is not easy to adjust. If a plurality of fine pre-drawn yarns of polyester are produced by adopting an outward blowing system, the denier (dp f) of short fibers is 0.3-2.0 den, and the Uterus half inert value is 0.3% or less. The present invention was completed by discovering that the thermal yarn difference (CV%) between the spindle and the spindle is 2% or less, so that a stretch yarn having excellent knit dyeing property can be obtained after post-processing.

It is an object of the present invention to provide a method for producing a plurality of fine pre-drawn yarns of polyester. Specifically, the polyester polymer may be prepared with respect to a polyester polymer having an intrinsic viscosity (IV) of 0.5 to 0.7 and a melting point of 245 to 265 ° C. It is a useful method of extruding a plurality of fine denier polyester pre-drawn yarns in a predetermined amount after heating and melt filtration. That way,

(a) a spinneret having uniformly discharged the tow 4 through the discharge hole of the spinneret 3 in which the extruded polyester melt 1 is arranged in a multiple ring shape; Also in the arrangement method of 3), the outermost diameter is D₂mm and the innermost diameter is D₁mm.

(b) After the discharge, the tow 4 passes through the unwind zone of length Ls mm under the spinneret 3 and passes through a cylindrical cooling cylinder 5 of diameter Do mm and length Lq cm. Cooling cylinder (5) provides a cooling wind blowing radially outward from the inside, and the outside of the circular cooling cylinder (5) sends a cooling wind of 0.2 to 0.6 m / sec wind speed to the electric tow, the glass transition temperature (Tg) of the polyester polymer It cools uniformly and collects at the same time until it becomes below).

(c) to electricity D₂, D₁, Dｏ, Ls, Lq

(i) D₂-D₁ 20 mm

(ii) 12 D₁-Do 33 mm

(iii) 2 Ls 20 mm

(iv) 15 Lq Satisfy the relationship of 40 cm

(d) winding and forming a plurality of thin denier polyester pre-drawn yarns at 1800 to 3000 m / min.

Another object of the present invention is to provide a radial outward blowing cooling system to uniformly wind the tow in the production of a plurality of gadenier pre-drawn yarns of polyester so that the uniform polyester multi-denier pre-drawn yarns To acquire.

In order to produce pre-stretched yarns having a denier (dp f) of short fibers of the present invention of 0.3 to 2.0 den, the denier (dp f) of short fibers is expressed as [melt discharge amount (g / min) x winding speed (m / min) ÷ (9000 x spinneret discharge labor)].

In the present invention, a decrease in the denier (d.p.f) of short fibers is achieved by increasing the discharge number of spinnerets per unit area (i.e., the density of the holes), and the length of the unwind zone is preferably 2 to 20 mm. As the density of holes increases, the distance between short fibers becomes shorter, so the length of the no-wind zone exceeds 20 mm, but the tow of single-line oil causes a resonant action, resulting in an unstable state, which increases the long period variation of the Euster and increases the wind speed. The desired half inert value of Euster is not able to obtain a reserve yarn of less than 0.3%. If the length of the no-wind zone is less than 2 mm, it affects the surface temperature of the spinneret of the cooling wind, the productivity is lowered, and the knitting of the product after stretching is poor.

In the arrangement method (see Fig. 5) of the discharge hole of the spinneret 3 employing the method of the present invention, the difference between the innermost diameter (D 과) and the outermost diameter (D₂) is calculated as D₂-D₁. It is set to 20 (mm). If the value of D₂-D₁ exceeds 20 mm, the difference in the wind received by the inner and outer tow 4 is likely to be large, so that the distance difference between the flash point and the spinneret 3 between the single yarns Due to its size, the difference in physical properties between single yarns included in the tow (4) tends to be large. Can not be. When the difference between the innermost diameter D 'and the diameter Do of the cooling cylinder 5 is 12 to 20 mm and D'-Do is 12 mm or less, the tow is likely to contact the cooling cylinder 5, so that thread breakage is likely to occur. Normal radiation is not achieved. When the D₁-Do is 33 mm or more, the blow cooling efficiency is lowered, so that the tow of the outermost diameter (D₂) of the spinneret is insufficient.

In order to properly cool the tow 4, the cooling cylinder 5 of the present invention adopts an optimal length of 15 to 40 mm, and the tow 4 has insufficient cooling when the length of the cooling cylinder 5 is 15 cm or less. Adhesion results in breakage of the thread.

When the length of the cooling cylinder 5 is 40 cm or more, the cooling winds interfere with each other, and the long half inert value of the Euster falls.

The cooling cylinder 5 used in the present invention has a cylindrical shape and is composed of a plurality of layers of fiber, a plurality of metal meshes, a metal sintered network, a ceramic sintering furnace network, or a plurality of layers of plural holes. The toe is cooled by blowing uniformly outward in the radial direction by i).

In the present invention, the cooling wind speed is preferably 0.2 to 0.6 m / sec. If the wind speed is 0.2m / sec or less, cooling is insufficient, resulting in the adhesion of the yarns, resulting in breakage of the yarns, and the long period variation of the Euster. When the wind speed is 0.6 m / sec or more, the long period variation of the Euster cannot be reduced, that is, there is no obvious effect on the long period variation of the Euster, and the tow 4 is cooled too much to cause the thread to break.

In the spinneret arrangement of the discharge hole adopted in the present invention, the density (hole density) is 7 to 21 per 1 cm 2, and the density of the holes is the hole of the discharge hole between D 2 and D 같이 as shown in FIG. 5. The number was divided by the area between D2 and D₁. That is, the number of holes (between D₂ and D₁) x 4 / π ÷ (D₂²-D₁²).

When there are seven holes per cm 2, the condition that the denier number (dp f) of the short fibers of the present invention cannot be achieved is 0.3 to 2.0 den unless the total discharge amount is reduced, and two plies are joined. Economics are inferior because production processes are needed.

When the density of holes per 1 cm 2 is 21, the arrangement between short fibers is close and the cooling difference between the single yarns is likely to be large, so that the long period variation of the Euster becomes large and stable spinning is not achieved.

The intrinsic viscosity (IV) of the polyester chip used in the present invention is 0.5 to 0.7. After melting, the polyester chip is extruded and spun from a spinneret to be stretched into a plurality of polyester denier preliminary yarns, and the breaking point elongation is increased. 100-160%, denier number of short fibers 0.3-2.0den,

Euster's long half inert value is less than 0.3% and thermal stress is less than 2%. Further, after stretching processing, spreading, temporary braiding, and air processing are performed to obtain a plurality of fine denier drawn yarns of polyester having excellent dendritic dyeability with a denier number of 0.2 to 1.0 den.

[Description of Analysis Method]

a. Thermal Stress Analysis

Analyzer: Textechno Dynafil M Type DPG / M

Analysis condition: elongation ratio 1: 6 heating temperature 150 ℃

Analysis Speed: 50m

The analysis time is 1 minute, and the thermal stress rate (CV%) is obtained.

b. Uster's long half inert value

Analyzer: USTER TESTER 3

Analysis Speed: 400m / min

Analysis time: 2.5 minutes

Analysis length: 1000m

c. Denier analysis of short fibers

The toe is wound 90 turns and weighed (weight is expressed in a grams). A multiplied by 100 is the total denier of toe b (den) divided by b and the number of toe c of 1 gram is the denier of short fibers. .

d. Strength analysis of elongation at break

Analyzer: Textecho Type FPA / M

Analysis condition: analysis length 10cm, tensile speed 60cm / min, preload 0.5CN / tex

The strength is the maximum strength, and the corresponding elongation is the breaking elongation.

e. Determination of woven fabrics dyability

Knitted tissue: Satin

Engaged in: 75d / 36f textured yarn

Working density: 150 units per inch, the product of the present invention is used for the horizontal thread, and the horizontal density is adjusted according to the denier number.

Dyeing, Finishing Conditions, Disperse Dyes 130 ℃ x 130min, Dyed and Finished Fabrics are checked for dry stains in the transverse direction under natural light.

O: Knitted dyeing is normal, and there is no transverse staining of light shades.

(Triangle | delta): There exists a slight transverse dyed stain.

X: There are quite a few transverse stains.

[Examples and Comparative Examples]

Under the conditions of Table 1, a plurality of polyester fine denier yarns of circular cross section are produced. Examples 1 to 3 and Comparative Example 1 are radial outward cooling systems shown in FIG. 3 used in the present invention, and are produced under the spinning conditions shown in Table 1. The long-term variation of the Eusters of Examples 1 to 3 was 0.3% or less, the thermal stress variation (CV%) was 2% or less, and the stretched yarn obtained after the temporary braiding process in the later step had a normal knitting property of the fabric (O). In Comparative Example 1, the airless zone was 45 mm, and the other conditions were the same as those of Example 1. The long-term variation of the Euster was large (0.55%), and the dyed stain of the fabric of the soft-yed yarn obtained after the temporary temporary braiding process was slightly dyed. (△) was there.

In Comparative Examples 2 to 3 of Table 1, the transverse air cooling system shown in FIG. 1 was used, and other conditions were the same as in Example 3. Although the no-wind zone of 15 mm in Comparative Example 2 is within the desired range of 2 to 20 mm, the short fiber far from the wind is not enough to receive the wind because of the use of the cross-wind cooling system. As high as 0.85%, there was a significant stain on the fabric dyeing.

In Comparative Example 3, since the windless zone was 45 mm, the single yarn and the single yarn collided with each other, so that they could not be produced.

Table 1

Table 2 relates to the production of a plurality of Y-shaped polyester thin denier yarns. In Examples 4 to 5, the radial outward blowing system of the present invention shown in Fig. 3 was used.

When produced under the spinning conditions in Table 2, the long-term variation of the Eusters of Examples 4-5 was less than 0.3% (0.29% and 0.25%, respectively), and the thermal stress variation was less than 2% (1.8% and 1.7%, respectively). The knitted dyeing property of the woven silk yarn obtained after the temporary braiding treatment in the later stage was normal (O). In Comparative Examples 4 to 5, the transverse air cooling system shown in Fig. 1 was used, and other conditions were the same as in Examples 4 to 5, but the non-wind zones of Comparative Examples 4 to 5 (15 mm each) were desired 2 to 20 mm. However, because the transverse air cooling system is used, the single yarn farther from the wind receives insufficient wind and the long cycle variation of the Euster is large (0.55% and 0.7%, respectively), resulting in significant staining on the fabric dyeing of the fabric. ([×] respectively).

[Table 2]

The present invention obtained by such a method can smoothly provide a plurality of thin denier polyester filaments to obtain a plurality of fine denier polyester stretched yarns having excellent knit dyeing properties.

Claims (5)

A plurality of fine deniers which extrude a plurality of fine denier polyester pre-drawn yarns in a predetermined amount after heating and filtering the polyester polymer with respect to a polyester polymer having an intrinsic viscosity (IV) of 0.5 to 0.7 and a melting point of 245 to 265 ° C. Regarding the manufacturing method of polyester pre-drawn yarn, (a) The tow is discharged uniformly through the ejection holes of the spinnerets arranged in the form of multiple rings on the extruded polyester melt, and the outermost in the arrangement of the ejection holes of the spinnerets arranged in the form of multiple rings. Let the diameter be D₂mm and the innermost diameter be D₁mm, (b) After the discharge, the tow passes through a non-wind zone of length Ls mm below the spinneret and through a cylindrical cooling cylinder of diameter Do mm and length Lq cm, the cooling cylinder radially blowing out from the inside. The electric toe sends a cooling wind with a wind velocity of 0.2 to 0.6 m / sec from the outside of the circular cooling tube, uniformly cools to below the glass transition temperature (Tg) of the polyester polymer, and collects it at the same time. (c) Electric D₂, D₁, Do, Ls, Lq (i) D₂-D₁ 20 (mm) (ii) 12 D₁-Do 33 (mm) (iii) 2 Ls 20 (mm) (iv) 15 Lq Satisfy the relationship of 40 cm (d) a method for producing a plurality of thin denier polyester pre-drawn yarns, comprising the steps of winding and completing the electric tow at 1800-3000 m / min. A method for producing a plurality of fine denier polyester pre-drawn yarns according to claim 1, wherein the discharge density of the spinneret is 7 to 21 per cm 2. The plurality of fine denier polyester pre-drawn yarns of claim 1, wherein the discharge hole of the spinneret is at least one selected from the group consisting of circular, hollow, Y-shaped, straight, square, triangular, hexagonal, cross-shaped and C-shaped. Manufacturing method. Denier (dp f) of short fibers of electric pre-stretched yarn is 0.3-2.0 den, breaking elongation is 100-160%, long period variation of Euster is 0.3 or less, and thermal stress variation is 2% The plurality of fine denier polyester stretched yarns obtained by the method for producing a plurality of fine denier polyester pre-drawn yarns according to claim 1 below. Plural fine denier poly with excellent knitting properties of fabrics having a denier (dp f) of 0.2 to 1.0 of short fibers obtained by performing temporary braiding, stretch braiding, air texture, or direct spinning on pre-drawn yarn. The plurality of fine denier polyester stretched yarns obtained from the method for producing a plurality of fine denier polyester pre-drawn yarns according to claim 1 which are ester stretched yarns.