KR100468086B1 - Method for manufacturing fine denier polyester hollow pre-oriented yarn and the yarn manufactured from the same - Google Patents

Abstract

In this study, denier of short fiber is 0.3-2.5d, long-term variation (u% 1 / 2inert) of Euster is less than 0.3%, thermal stress variation between weight and weight is less than 4%, hollow ratio It is for obtaining fine denier hollow fibers of polyester having 25-40% of medium and stretching, and short fibers denier of 0.2-1.0d, hollow ratio of 25-40%, and excellent knit dyeing.

In order to achieve this purpose, this paper has a length of 2 to (8060 × discharge rate ÷ number of squares) mm for the melt spinning blower, a length of cooling tube of 15 to 40 cm, and a wind speed of 0.2 to 0.6 m. In the method of arranging the ejection openings of the spinneret using a radial blast blower of s / s, the difference between the outermost diameter and the innermost diameter is 20 mm or less, and the innermost hole diameter is the diameter of the cooling air pipe. The distance of 12 mm or more and 33 mm or less, and the density (hole density) of the discharge port in the arrangement of the spinnerets is 7 to 15 per cm 2.

(Iii) It is characterized by providing a manufacturing method of denier polyester hollow pre-stretched yarn.

Description

METHOD FOR MANUFACTURING FINE DENIER POLYESTER HOLLOW PRE-ORIENTED YARN AND THE YARN MANUFACTURED FROM THE SAME}

The present invention is to obtain a thin denier hollow fiber of polyester, which is lightweight, excellent in thermal insulation and excellent in flexibility through excellent productivity.

Specifically, denier of short fibers is 0.3-2.5d, long-term variation (u% 1 / 2inert) of Euster is 0.3% or less, thermal stress variation between weight and weight is 4% or less, hollow ratio It is obtained by obtaining the fine denier hollow fiber of polyester which is 25-40% of medium voids, and it is 02.-1.0d of short fiber deniers, 25-40% of hollow ratios, and excellent in dyeing of knit fabrics by extending | stretching.

The present invention relates to a method for producing a thin denier polyester hollow filament and a thin denier polyester hollow pre-drawn yarn produced by the method.

Polyester fibers are the most widely used among the three synthetic resins because of their excellent processability and knit dyeing and low cost.

The process for producing polyester fibers is roughly described as a process of polymerizing a terephthalic acid and ethylene glycol to produce a polyester chip or melt, extruding a certain amount in a molten state, weighing and discharging, cooling again, finishing with an emulsion, and winding up. (卷取) to complete. In an electric processor, cooling has a great influence on the properties and uniformity of the yarn.

Cooling methods currently in use include a cross flow quenching system as shown in FIG. 1, a radial out-to-in flow quenching system as shown in FIG. There is a radial in-to-out flow quenching system.

In the horizontal blower (see Fig. 1), the tow 4 is discharged from the spinneret 3, and then cooled by blowing cooling air from one side of the yarn.

In the radial inward blower (see Fig. 2), the tow 4 is discharged from the spinneret 3 and then passes through the inside of the cooling cylinder, whereby the cooling air cools the tow from the outer periphery.

In the radial outward blower (see Fig. 3), the tow 4 is discharged from the spinneret 3 and then passes through the outside of the cooling cylinder, whereby the cooling air cools the tow from the inner periphery.

The most commonly used of the three electric cooling methods is the horizontal blower. The radial inward blower and the radial outward blower are often used for the production of staple filaments, and are also used for the production of some industrial chambers.

Polyester fibers have many advantages, but they are less flexible and warmer than natural cotton or wool (wool) fibers. So the thin denier polyester hollow filament appeared. Its texture is different from ordinary thick denier hollow yarns, so there is no rough touch, and it is also lightweight and excellent in heat retention.

The present invention adopts a radial outward blower as a cooling blow method during melt spinning in the manufacturing process of thin denier pre-stretched yarn, and the short fibers obtained have a denier of 0.3 to 2.5 d and a long period variation of the uster. inert value; u% 1/2 inert) less than 0.3%, thermal stress variation between spindle and spindle is less than 4%, hollow rate is 25 to 40%, stretch it again, twisting, air processing When drawing is carried out by e.g.) or the like, the denier of monofilament becomes 0.2 to 1.0 d and the porosity is 25 to 40%, thereby obtaining a polyester thin denier hollow yarn having excellent knit dyeing properties.

In order to achieve the purpose of light weight and excellent heat retention, methods of making dough and clothing from polyester hollow fibers are already in widespread use. However, general polyester hollow fiber has a rough feel when the denier of the short fiber exceeds 1.5d, and furthermore, it becomes a muscle shape in order to cool the surface evenly, which limits its use range.

In order to exhibit light weight, good heat retention, and flexibility, a method of increasing the hollow ratio by lowering the denier of short fibers may be devised.

Usually, there are two methods of lowering the denier of short fibers, namely, the total discharge amount of the polyester melt and the discharge hole number of the spinneret are increased, the discharge hole number of the spinneret is constant, and the polyester melt is And a method of lowering the total discharge amount of.

In most cases, the transverse blow method is used for the cooling blower in the melt spinning of polyester filament, and the radial inward blowing method is adopted in some cases. Therefore, the cooling blow method for the melt spinning of the thin denier hollow pre-stretched yarn is mainly two kinds.

However, when the lateral air cooling system is used, only one side of the tow can send wind, so the difference in the degree of cooling between the surface receiving the wind and the surface not receiving the wind is large and the toe cannot be cooled uniformly.

In particular, the method of increasing the ejection opening of the spinneret increases the difference of cooling degree and increases the ejection amount of the spinneret, which increases the number of holes per unit area, that is, the density of the holes. As a result, the cooling rate is always insufficient. And hollow uniformity cannot be achieved.

On the other hand, the method of lowering the total amount of polyester melt is easy to cause a decrease in productivity, and since two external strands of twisted fiber have to be spun together when producing a product, dyeing troubles can be caused by the difference in physical properties of the two threads. easy.

In addition, if the radial inward blower is used, it is difficult to adjust the cooling wind and if the wind speed is too low, sufficient cooling effect of the tow is not obtained, which leads to an increase in the long period variation rate of the Euster and even adhesion between the outer strand yarn and the yarn. Occurs and radiation is not smooth.

On the contrary, if the wind speed is too high, mutual interference caused by the cooling wind in the opposite direction of the blowing occurs, causing the tow to become unstable and the filament's thread and the thread collide with each other, thus reducing productivity and making it difficult to enter the tow's cooling tank. It adversely affects the production of denier hollow yarns that become difficult to operate.

Therefore, how to lower the denier of short fibers and increase the hollow rate while maintaining productivity is an urgent task for polyester hollow yarn manufacturers.

For example, US Patent No. 5,487,859 or European Patent No. 0 860 523A2 are disclosed. However, US Patent No. 5,487,859 does not describe the cooling method in detail, and the length of the wind-free zone is 2 to (12 ×). [Fabric fiber denier] ¹ / ²) cm is a long windless zone, so that the desired hollow ratio and euster cannot be achieved. In addition, the hollow rate of the product produced by the electric method is at least 10%, which is a considerable difference from the 25-25% desired.

In the cooling method used in European Patent No. 0 860 523A2, the length of the no-air zone is 10 to 30 mm, the blowing length of the first area quenching port is 80 to 120 mm, and the blowing length of the second area slow cooling port is 150. -350 mm is optimized. The hollow point of the finished product is 40 to 80%, and the point lies in having hollow invariance after post-processing.

As for the radial outward blower, U.S. Patent No. 5,536,157 and U.S. Patent No. 5,866,055 are disclosed, but since the denier of short fibers is used for the production of 1.1-22.2d polyester industrial yarn, There is no access to the recipe.

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

2 is a view showing several thin denier polyester drawn yarns produced by a conventional radial inward blowing system;

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

4 is a view showing a cooling cylinder in a 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

Fig. 7 is a diagram showing direct radiation drawing of a plurality of thin denier polyester drawn yarns produced by a radial outward blowing system according to the present invention.

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

DESCRIPTION OF SYMBOLS 1 Polyester weld body 2 Spinning head 3 Spinning process

33 discharge port 4 tow 5 cooling tube

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

8-1: Heating Roller 8-2: Heating Roller 8-3: Separation Wheel

9 Winding Machine 10 Pre-stretched Cake 11 Heating Roller

12 heater 13 heating roller 14 filament

In order to solve the above problems, the inventor of the present invention examines the manufacturing conditions and the cooling apparatus in detail in the prior art, and as a result, a multiple ring phase arrangement in which a polyester polymer having a specific intrinsic viscosity and melting point is disposed (Difference between outer ring diameter and inner ring diameter The present invention was completed by uniformly discharging the tow through a spinneret having a diameter of 20 mm and blowing the cooling air from the inside to the outside until it reached a normal cooling tube, and winding it up to form it.

The present invention increases the number of production per unit area of the spinneret, thereby increasing the hollow ratio of the product and the hollow ratio distribution uniformity between the short fibers and the short fibers, thereby lowering the denier of the short fibers, and This makes it possible to produce excellent yarns.

The present invention aims to provide a method for producing a plurality of thin denier polyester hollow pre-stretched yarns. Specifically, polyester polymers having an intrinsic viscosity (IV) of 0.5 to 0.7 and a viscosity of 245 to 265 ° C are used as raw materials. Heat-melt and filter the electric polymer, and then extrude a plurality of fine denier polyester hollow pre-stretched yarns in a predetermined amount.

(a) A uniform amount of the tow 4 is discharged uniformly at the discharge port of the spinneret 3 (see FIG. 5) arranged in a multi-ring manner in which a predetermined amount of the extruded polyester melt 1 is arranged in an electric multi-ring shape. The discharge port 33 in the projection 3 has the outermost diameter of D₂mm and the innermost diameter of D₁mm,

(b) The discharged tow 4 passes through a non-flow zone of length Ls mm below the spinneret 3 and through a circular cooling tube 5 of diameter Do mm and length Lq cm. The cooling cylinder 5 supplies the cooling wind blown radially from the inside outwards, and cools the cooling wind at a rate of 0.2 to 0.6 m / s from the outside of the circular cooling cylinder 5 with respect to the electric tow 4. By condensing and cooling uniformly until it reaches the glass potential temperature (Tg) of the electric polyester polymer or less,

(c) with respect to electricity D₂, D₁, Do, Ls, Lq,

(i) D₂-D₁ 20 (mm)

(ii) 12 D₁-Do 33 (mm)

(iii) 2 Ls 8060 × total discharge amount (g / min) ÷ (number) ² (mm)

(iv) 15 Lq 40 (cm), satisfy the conditions,

(d) winding and completing the electric tow 7 at a speed of 1800 to 4000 m / min.

Characterized in that it comprises a step.

It is another object of the present invention to provide a radial outward blowing cooling apparatus for producing polyester thin denier hollow filaments.

The device can produce uniform polyester thin denier hollow filaments by allowing the toe to receive wind uniformly.

The length of the windless zone below the spinneret 3 is optimally 2 to (8060 x discharge amount ÷ [number] ²) mm. If the length of the non-wind zone is less than 2 mm, productivity decreases because the cooling wind affects the surface temperature of the spinneret. On the other hand, if the length of the wind-free zone exceeds (8060 × discharge amount ÷ [number] ²) mm, the long period variation of the Euster becomes large, and even if the wind speed is increased, the desired hollow ratio is 25-40% and the long period variation of the Euster is 0.3d% or less. You cannot get a preliminary drawer. In addition, after the stretching process, the dyeing of the fabric becomes worse, resulting in horizontal staining.

In the arrangement (see Fig. 5) of the discharge port 33 of the spinneret 3 adopted in the present invention, the difference between the innermost diameter D 'and the outermost diameter D2 is D₂-D₁. It is set to 20 mm. If the value of D₂-D₁ exceeds 20mm, the difference between the winds received by the inner and outer tow respectively, that is, the difference in the hollow ratio between the single yarn and the single yarn included in the tow and the difference in their physical properties become excessively large. Dyeing is poor.

The difference between the innermost diameter D 'and the diameter Do of the cooling cylinder 5 is 12 to 33 mm, and when the value of D'-Do is less than 12 mm, the tow 4 is moved to the cooling cylinder 5; It is easy to hit, breakage of the thread occurs, the normal radiation is not achieved. If the value of D₁-Do exceeds 33 mm, the cooling effect due to the backwind is inferior, and the tow at the place of the outermost diameter (D₂) of the spinneret 3 has insufficient cooling, so that the hollow ratio is lowered and the thread breaks. Easy to occur

In order to obtain a better cooling effect of the tow, the length of the cooling cylinder 5 employed in the present invention is optimally 15 to 40 cm.

If the length of the cooling cylinder 5 is less than 15 cm, the tow cannot be sufficiently cooled and adhesion and breakage of the yarn occur.

On the other hand, if the length of the cooling cylinder exceeds 40 cm, the cooling winds interfere with each other, and the long period variation of the Euster becomes large. The cooling cylinder 5 used in the present invention has a tubular shape, and is made of a plurality of layers of fiber and a plurality of metal meshes, a metal sintered filter, a ceramic sintered filter, or a multi-layer porous plate. The cooling wind cools the tow by blowing uniformly radially inwards and outwards in the radial direction from the thin hole.

In the present invention, the cooling wind speed of 0.2 to 0.6 m / s is optimal, and if the wind speed is less than 0.2 m / s, the cooling is insufficient, the adhesion and breakage of the thread occurs, and the long period variation of the Euster is large, The rate falls.

On the other hand, if the wind speed exceeds 0.6m / s, it is not possible to reduce the long period variation of the Euster, that is, there is no obvious effect on the reduction of the long period variation of the Euster, and it is easy to cause breakage of the thread due to excessive cooling of the tow. .

The discharge ports 33 used in the present invention have a density (hole density) of 7 to 15 per cm 2 in the spinneret 3.

The hole density is a number obtained by dividing by the area between D2 and D ', as shown in FIG. The formula is expressed as the number of holes (between D₂ and D₁) × 4 / π × (D₂²-D₁²).

If the hole density is less than 7 / cm 2, the short fiber denier of the present invention does not satisfy the condition of 0.3 to 2.5 d unless the total discharge amount is reduced. Moreover, it is uneconomical because it cannot be commercialized unless it is a joint venture.

If the density of one side is more than 15 / cm2, the arrangement of single fibers becomes too dense, so the difference in cooling degree between single yarn and single yarn increases, and accordingly, long-term edge of Euster increases and thus no stable spinning occurs.

As described above, the intrinsic viscosity (IV) of the polyester chip used in the present invention is melted between 0.5 to 0.7 and then extruded from the hollow spinneret 3 to finish spinning, stretching, cooling and emulsion. Finally, it is wound up and finished with polyester hollow pre-stretched yarn.

The finished polyester hollow pre-stretched yarn has a breaking elongation of 70 to 180%, a short fiber denier of 0.3 to 2.5d, and a hollow ratio of 25 to 40%. Less than 0.3%, the thermal stress variation between the spindle and the spindle is less than 4%.

In addition, when stretching is performed such as stretching, air texture, or direct spin drawing as shown in Fig. 7, the fine fibers have a denier of 0.2 to 1.0 d and a hollow ratio of 25 to 40%. Polyester thin denier hollow yarns with knit dyeing are made.

[Description of Analysis Method]

The analysis method of the present invention is as follows.

a.Measurement of hollow ratio

Photographs were taken with a commercially available 800x optical microscope, and double-folded magnification was used to cut 10 sections in one measurement, and cut out the hollow and solid parts with scissors and weigh them.

Hollow ratio = solid part weight ÷ (hollow part weight + solid part weight) × 100%

b. Analysis of thermal stress variation between spindles

Analyzer: Textechno Dynafil M Type DPG / M

Analysis condition: elongation ratio 1.6 heating temperature 150 ℃ analysis speed 50M

Analysis time 1 min

Each cheese is wound one by one, and the thermal stress is analyzed by the above method to calculate the thermal stress between spindles.

c. Uster half inert value (u% 1/2 inert) analysis

Analyzer: USTER TESTER 3

Analysis Speed: 400m / min

Analysis time: 2.5min

Analysis length: 1000m

Each cheese is wound up one by one, and the long-term variation of Euster is analyzed by the above method.

d. Denier analysis of short fibers

Wind up the tow 90 turns and place it on the balance to measure the scale. The scale is expressed in grams and multiplied by a to 100 is the total denier b of the tow, and dividing b by the number c of the yarns included in each tow gives the denier of short fibers.

e. Analysis of Elongation at Break

Analyzer: Texteco Type FPA / M

Analysis condition: analysis length 10cm, elongation speed 60cm / min,

The preload is 0.5 cN / tex.

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

f. Determination of woven fabrics dyability

Knitted fabric: Satin Engaged: 75d / 36f textured yarn

Working Density: 150 pieces / 2.54㎝

The reversal yarn is adjusted to include the denier number by using the yarn manufactured according to the present invention.

Dyeing, finishing condition: Disperse dyes 130 ℃ × 130min, dye, finish and dry and check for transverse stains under natural light.

How to determine transverse level

Excellent (O): The color of the surface of the dyeing surface dyed under natural light is uniform.

Normal (△): Under natural light, there is a short transverse muscle stain on the surface of the dyed tissue (more than 1cm in length)

Transverse smears (X): In natural light, there are long transverse smears on the surface of the dyed tissue (more than 1 cm in length).

g. Hot Water Shrinkage Rate Analysis

Wind the thread 20 laps (20 meters) with a failing machine, apply a load of 1 g / den under the thread bundle, then record the length a (cm) on the graph paper and pack the thread sample in the proper way. After leaving for 30 minutes in a hot water bath at 100 ° C, take it out and apply a load of 1 g / den again to record the length (b).

Shrinkage ratio = (original length of sample chamber-length after shrinkage) ÷ original length x 100% of sample.

[Examples and Comparative Examples]

In Table 1, the radial outward blower (see FIG. 3) is used in the embodiment of the present invention, the horizontal blower (see FIG. 1) in the comparative example 1, and the reflective inward blower (see FIG. 2) in the comparative example 2. Was used.

In Example 1, the long period variation, the hollow ratio, and the thermal stress variation between the spindles of the obtained polyester thin denier hollow pre-stretched yarns were all superior to Comparative Example 1 and Comparative Example 2, As shown, the knitted dyeing property of the polyester gadenier hollow yarn prepared in Example 1 became good, and transverse muscle staining did not occur.

In Example 2, when the manufacturing conditions of the denier hollow pre-stretched yarn having a short fiber denier of 0.8 d are 8 mm in no wind zone length and 35 mm in cooling tube length, the long period of the Euster is 0.29%, the hollow ratio is 30%, Polyester thin denier hollow pre-stretched yarn with 3.4% thermal stress variation between spindles could be prepared.

In addition, the yarn was excellent in the short fiber denier 0.52d, hollow ratio 29%, knitted dyeing when stretched.

Claims (4)

The polyester polymer having the intrinsic viscosity (IV) of 0.5 to 0.7 and the melting point of 245 to 265 ° C is heated and filtered, followed by extruding a certain amount to make the fine denier polyester preliminary polyester for making the polyester fine denier preliminary drawn yarn. In the manufacturing method of the company, (a) The polyester melt which has been extruded in a certain amount is disposed on a multiple ring. The toe is discharged uniformly through the discharge port of the heated spinneret. In the arrangement of the spinneret arranged in the multi-ring shape, the outermost ring diameter is D₂mm, the innermost D₁mm, (b) The discharged tow is first passed through a windless zone of Ls mm below the spinneret, and then through a cylindrical cooling cylinder of diameter Do mm and length Lq cm, and the cooling cylinder is directed outward. Supply the cooling wind blown radially, and send the cooling wind with respect to the tow at a speed of 0.2 to 0.6 m / s from the outside of the cooling cylinder, until the glass transition temperature (Tg) of the electric polyester polymer is below. While cooling uniformly and focusing at the same time, (c) at this time with respect to D₁, Do, Ls, Lq, (i) D₂-D₁ 20 (mm) (ii) 12 D₁- Do 33 (mm) (iii) 2 Ls 8060 × total discharge (g / min) ÷ (number) ² (mm) (iv) 15 Lq 40 (cm), satisfy the relationship of, (d) manufacturing method of fine denier polyester hollow pre-stretched yarn comprising the steps of winding and completing electric tow at a speed of 1800 to 4000 m / min. The manufacturing method of the fine denier polyester hollow pre-stretched yarn of Claim 1 whose array density of the ejection opening of a spinneret is 7-15 per cm <2>. The obtained thin denier polyester hollow pre-stretched yarn has a denier number of short fibers of 0.3 to 2.5 d, a breaking point elongation of 70 to 180%, a long period variation of the Euster of 0.3 or less, and between the spindle and the spindle. The method of manufacturing thin denier polyester hollow pre-stretched yarn according to claim 1, wherein the thermal stress variation of the polymer is 4% or less and the hollow ratio is 25 to 40%. In the electro-drawn yarn in which pre-stretched, air texture or direct spinning draw is performed on undrawn yarn, The short fibers obtained by the processing have a denier number of 0.2 to 1.0 d, a hollow ratio of 25 to 40%, and an electro-drawn yarn has an elongation at break of 15 to 45% and a long period of 0.3% or less of Euster, and has excellent knit dyeing properties. Fine denier polyester pre-stretched yarn produced by the method according to claim 1, characterized in that the dough is laid out flat. Table 1 [Table 2]