KR100519859B1 - Manufacturing method of polyester biaxial blended yarn - Google Patents

Abstract

The present invention has a clean appearance by improving the interlace flaw due to the difference of two-tone (TWO TONE), which is a disadvantage of blended yarn when processing into textiles and knitted fabrics by reducing the dyeing difference between screening and weaving yarn. It is related with the manufacturing method of polyester biaxially blended yarn excellent in a sense.

Conventional di-shrink blended yarn has excellent softness to some extent, but dyeing lines are generated due to the difference in dyeability between two yarns. It is not being done.

In the present invention, a stretched yarn obtained by stretching and heat-treating a polyester low shrink yarn having a spinning speed of 5000 to 7000mpm and a shrinkage rate of 2 to 5%, and an undrawn yarn having a spinning speed of 2000 to 4000mpm and a shrinkage rate of 50% or more in a woven fiber or knitted state. It is an improved invention on the production of polyester bispun blended yarn with improved softness and reduced production cost compared to the blended yarn of high-stretched yarn and unstretched yarn using modified polymer.

Description

Manufacturing method of polyester biaxial blended yarn

The present invention has a clean appearance by reducing the dyeing difference between screening and weaving and improving interlacing defects caused by two-tone differences, which are disadvantages of blended yarns, when processing into knitted fabrics. The present invention relates to a method for producing a polyester biaxially blended blend having excellent softness, and more particularly, a polyester non-drawn yarn and an air entanglement apparatus after stretching and heat-treating a low shrinkable polyester having a low degree of amorphous orientation in an apparatus capable of stretching and heat treatment. It is related to the manufacturing method of polyester biaxially blended blended yarn having improved softness and interlacing defects, which are disadvantages of blended yarns, by performing blending entanglement treatment using.

Conventionally, as a method of manufacturing a bishrink blended yarn, a method of blending heat by varying the heat setting temperature at the time of stretching is disclosed in Korean Patent Laid-Open Publication No. 95-14383, and a method of blending a modified high shrink yarn and a general drawn yarn is It is disclosed in Korean Patent Publication No. 93-13279, and a method of intermixing general stretched yarn and partial orientation yarn is known by Korean Patent Publication No. 93-16581, and other methods of blending modified high-yield yarn and low-yield yarn. Etc. are known.

However, biaxial shrink fiber blended by different heat-setting temperature among these methods is not interlaced due to dyeing difference between two yarns during processing and thermal stress temperature difference is not large, so shrinkage difference expression is insufficient. Soft feeling is lacking.

Di-shrink blended yarns produced by the method of blending modified high-yarn yarns with general stretched yarns and by blending general stretched yarns with partial-orientated yarns exhibit good shrinkage difference, but due to the dyeing difference between the two yarns, interlaced scratches occur in the fabric state. The fabric is degraded.

The bi-shrink blended yarn manufactured by the method of blending the modified high-shrink yarn and the low-shrink yarn has excellent drawback difference, and the soft touch in the fabric and the difference in dyeing between the two yarns are small, but the production cost is high due to the use of the modified high shrink yarn. .

The present invention solves this problem of the prior art by reducing the non-shrinkage difference with the non-drawn yarn by adjusting the amorphous orientation to low, low shrinkage of 2 to 5% non-shrinkage and non-stretched yarn with a non-shrinkage rate of 50% or more at a spinning speed of 2000 to 4000mpm As the yarn, the low shrinkage yarn was stretched by heat-treating the low shrinkage yarn using a drawing device with an air entanglement device, and then the present invention was completed by producing a mixed biaxially blended blended yarn using an air entanglement device.

The unstretched yarn used in the present invention is an unmodified polyester fiber having a non-shrinkage ratio of 50% or more, produced at a spinning speed of 2000 to 4000 mpm, and the low shrinkage yarn has an amorphous orientation satisfying the following formula in order to equalize the dyeing ratio with the high shrink yarn. It is an unmodified polyester fiber with a non-shrinkage ratio of 2-5%.

0.1 ≤ amorphous orientation ≤ 0.5

Here, amorphous orientation is obtained by the following equation.

Δn-x Fc Δb

FaΔa = ---------------------------

(1-x)

Δn: birefringence (measured by polarizing microscope)

x: degree of crystallinity (measured by density gradient tube)

Fc: crystal orientation (measured by XRD)

Δa, Δb: constant

The low shrink yarn that satisfies the above formula can be obtained with a high speed spinning of 5000 ~ 7000mpm spinning speed.

Amorphous orientation plays a very important role in dyeing, and when the amorphous orientation is low, the penetration of dye particles is easy, resulting in a high dyeing rate.

If the amorphous orientation is 0.1 or less, the dyeing rate is satisfactory, but the physical properties of the yarn is lowered, so it is easy to cause problems in processes such as dyeing and processing, and if it is 0.5 or more, the dyeing rate may not be sufficient, resulting in a dichroic effect. Such low shrinkage yarns have good dyeing properties, so when used as a screening for blended yarns, the interlacing defects can be improved due to less difference in dyeability compared to that of conventional blended yarns.However, when used as a general fabric, non-shrinkage and heat shrinkage stresses are lower than those of general drawn yarns. There are disadvantages in that it is difficult to set the processing conditions to maximize the appearance of the dead stock during processing. In the case of blended yarns, when the difference in the non-shrinkage rate and the maximum heat shrinkage stress between the ponchos increases, it is known that maximal dead-expression in the fabric is maximized, so that the soft feeling is excellent. Stretching heat treatment at 1.10 ~ 1.30, heat setting temperature 80 ~ 140 ℃, non-shrinkage rate is 2 ~ 8.5%, maximum heat shrinkage stress is 0.20 ~ 0.6g / d, non-shrinkage property is 2 ~ 5%, and maximum heat shrinkage stress is 0.2 ~ 0.6g / d. Compared with 0.3g / d, it has excellent non-shrinkage rate and maximum heat shrinkage stress and has the same level of dyeability.

This fact is confirmed from the results of non-shrinkage rate and heat shrinkage stress test measured by stretching and heat-treating low shrinkage 75D denier / 36 filament with a radial speed of 6000mpm as shown in Table-1 below.

Table 1

Condition Elongation ratio 1.23 1.25 1.27 1.25 1.25 1.25 1.25 Drawing temperature (℃) 90 90 90 90 90 90 90 Heat setting temperature (℃) 120 120 120 80 100 140 160 Non-shrinkage rate (%) 3.7 4.0 4.5 8.5 6 2.5 2.0 Maximum heat shrinkage stress (g / d) 0.30 0.33 0.40 0.60 0.40 0.27 0.23

If the draw ratio is 1.0 ~ 1.10, the non-aqueous and maximum heat shrinkage stress is almost unchanged, so the effect on the fabric cannot be expected.If the draw ratio is above 1.30 and the heat setting temperature is below 80 ℃, the non-water and maximum heat shrinkage stress increase. Defects such as moors, loops, and the like are easy to occur, and the shrinkage expression temperature decreases, so that stress relief occurs during the continuous yarn setting, so that the shrinkage does not occur in the fabric. When the heat setting temperature is more than 140 ℃, non-aqueous and maximum heat shrinkage stress is reduced, shrinkage in the fabric is reduced, it is difficult to expect the improvement of interlacing defects due to the decrease of dyeability due to the increase in crystallinity.

The low shrinkage yarns thus prepared were interwoven with undrawn yarn and air entanglement at a level of 50-100ea / m. If the number of entanglements is less than 50ea / m, the workability may decrease during weaving and weaving due to the splitting of the two yarns due to poor intermixing conditions. The production cost increases due to the defects of mixed fiber yarns, poor workability during processing and excessive consumption of compressed air.

The bisulfate horn-seam manufactured in this way was excellent in soft and repulsive feeling by improving the dyeing difference between the vinegar and the shrinkage of the screening in the fabric, and it was possible to improve the interlace flaw by the dyeing tea of the vinegar.

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

Example 1

The low shrink yarn was spun at 290 ° C. using a spinning device of FIG. 1 to spin a polyethylene terephthalate chip at 290 ° C. to obtain a yarn of 75 denier 36 filaments having a specific shrinkage of 3%. The non-drawn yarn spun the same chip as the low shrink yarn at 280 ° C. and spun at 3000 mpm to obtain 85 denier 36 filament yarns having a non-shrinkage ratio of 60%. The double low shrinkage yarn was drawn and heat set using a drawing device at a draw ratio of 1.25, a drawing temperature of 90 ° C., and a heat setting temperature of 100 ° C. to obtain a drawn yarn having a non-aqueous 6% and a maximum heat shrinkage stress of 0.40 g / d. The unstretched yarn and the compressed air of 3Kg / cm 2 were interlocked through the air entanglement device to obtain a biaxially blended horn-seam yarn with 80 entanglements. The blended yarn was twisted at 800T / M and weaved to 110 slits / inch and 90 weft / inch for weft yarn to complete the fabric through refinement, reduction, weight loss, dyeing and processing.

Comparative Example 1

Using the same low-shrink yarn as in Example 1, after stretching and heat treatment at a draw ratio of 1.05 and a heat setting temperature of 100 ° C., blending and processing were performed in the same manner as in Example 1 with the undrawn yarn.

Comparative Example 2

Using the same low-shrink yarn as in Example 1, the draw heat treatment was performed at a draw ratio of 1.25 and a heat setting temperature of 160 ° C., followed by mixing and processing in the same manner as in Example 1 with the undrawn yarn.

Comparative Example 3

By using the spinning device of Figure 1 by spinning at a speed of the first high roller temperature 88 ℃, 1400mpm, the second high roller roller temperature 130 ℃, 4500mpm to produce 75 denier 36 filament yarn and the same as the undrawn yarn and Example 1 The mixing and processing were carried out by the method.

Comparative Example 4

In Comparative Example 3, yarns of 75 denier 36 filaments wound at a spinning speed of 4500 mpm were blended and processed in the same manner as in Example 1 with a low shrinkage yarn before the stretching process in Example 1. The finished fabrics were evaluated by the sensory test for the softness of the fabric surface and the occurrence of dyed lines.

In the sensory evaluation, 10 subjects were evaluated by fabric, and the subjective evaluation results of each individual were classified into 3 grades of good: 8 or more, normal: 4-7, and poor: 3 or less.

The non-shrinkage rate is measured by measuring the sample length (L0) under 100 mg / d of yarn and performing non-water treatment for 20 minutes in the tensionless state. Sample length (L1) is measured under a load of 100 mg / d after non-water treatment. Non-shrinkage rate is computed by following Formula.

(L ₀ ― L ₁ )

Non-shrinkage ratio = --------------------------- × 100

L ₀

The maximum heat shrinkage stress was measured by using the Kanebo's thermal stress gauge (TYPE: KE-2S) to increase the temperature rise rate to 2.5 ℃ / sec at a maximum length of 10cm and the initial load of 2.5g to measure the thermal stress curve to determine the maximum stress of the thermal stress curve. Evaluated.

When the comparative evaluation of the product of the Example and Comparative Example manufactured under the above conditions are as follows.

Analysis item Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Hornsome Temple Denier (d) 145 160 145 160 160 Filament number (f) 72 72 72 72 72 Properties Non-shrinkage rate (%) judge 6 3 2 9 9 Draft 60 60 60 60 3 △ 54 57 58 51 6 Maximum heat shrinkage stress (g / d) judge 0.40 0.24 0.23 0.40 0.40 Draft 0.10 0.10 0.10 0.10 0.22 △ 0.30 0.14 0.13 0.30 0.18 Drawing condition Elongation ratio 1.25 1.05 1.25 - - Heat setting temperature (%) 100 100 160 - - textile Softness Good usually Bad Good usually Dyeing Good Good usually Bad usually

As shown in the above results, when the draw ratio is less than 1.10 as in Comparative Example 1, the difference between the low shrinkage yarn and the shrinkage rate that has not undergone the stretching process is small, and the interlacing defects in the fabric can be improved, but the processing conditions for maximizing the appearance of the fourth order are set. When the heat setting temperature is 140 ° C. or more as in Comparative Example 2, this is difficult, and the specific shrinkage rate, the maximum thermal stress temperature, and the dyeing property are lowered. In the case of general blended yarn as in Comparative Example 3, there is a tendency that the appearance of the inferiority between the eccentric yarn is good and has a soft texture, but the interlace flaw is generated due to the dyeing difference between the ectopic yarns, resulting in a deterioration of the appearance of the fabric. In Comparative Example 4, there was a small difference in shrinkage rate between the eccentric yarns, and due to the dyeing difference between the two yarns, the touch on the fabric was lowered and the appearance of the fabric was reduced due to the dichroic effect.

The present invention is to reduce the difference between dyeing and weaving yarn by improving the interlacing defect caused by the difference of two tone (TWO TONE), which is a disadvantage of woven fiber, and has a clean appearance. Since the expression was enlarged, the polyester biaxially blended yarn excellent in the soft feeling was obtained.

1 is a spinning device for producing a low shrinkage yarn used in the present invention,

Figure 2 is a schematic of the apparatus for producing biaxial horn sum yarn of the present invention.

<Explanation of symbols for main parts of drawing>

1: detention 2: the first roller

3: second roller roller 4: winding roller

5: Low Conservation House 6: Undrawn Shrine

7: HOT ROLLER 8: HOT PLATE

9: air entanglement device 10: drawing roller

11: Hornsome Temple

Claims (3)

Stretched yarn made by stretching and heat-treating polyester low shrinkage yarn with 2 ~ 5% non-shrinkage rate using air drawing device with non-contracting yarn with air shrinkage 50% ~ 100ea A method for producing polyester biaxial blended yarn, characterized in that blending at / m improves softness and interlacing defects. The method of claim 1, wherein the spinning speed of the low shrinkage yarn is 5000 to 7000mpm, has a specific shrinkage of 2 to 5%, and satisfies the following formula. 0.1 ≤ amorphous orientation of low shrinkage yarn ≤ 0.5 The method of claim 1, wherein the spinning speed of the unstretched yarn is 2000 to 4000 mpm, and has a non-shrinkage ratio of 50% or more.