KR20020059021A - Process for preparing a nylon 6 yarn with triangular cross-section - Google Patents

Abstract

PURPOSE: Provided is a manufacturing method of nylon6 yarn having triangular cross-section, excellent luster, softness, the sense of touch and dyeing property. CONSTITUTION: The nylon6 yarn having triangular cross-section is obtained by a process containing the steps of: melt-spinning nylon6 from a triangular spinning nozzle(1); cooling yarns in a cooling-air duct(2) with 0.4-0.5m/sec of cooling air; treating with emulsion on a position of 90-110cm from the spinning nozzle; passing through the first godet roller(4) rotating at 3900-4600m/min. of velocity and the second godet roller(5) rotating at 4500-5200m/min. of velocity to draw; and then winding at 4400m/min. of velocity.

Description

Process for preparing a nylon 6 yarn with triangular cross-section}

The present invention is stable in the physical properties of sulfuric acid relative viscosity 2.40 ~ 2.54, strength 4.7 ~ 5.3g / denier, elongation 41 ~ 48%, single yarn fineness is 1.1 denier or less, nylon 6 heteromorphic cross-section yarn having a triangular cross section FDY ( Fully Drawn Yarn) method.

Conventionally, there is a manufacturing method of a sectional cross-section yarn having 2.5 denier and a ribbon-shaped cross section (US Pat. No. 4,801,503), but the fiber produced by this method is a low-oriented yarn (LOY) company, which usually requires a two-step process.

Such LOY is a low speed winding yarn having a spinning speed of approximately 1,500 m / min or less.

Nylon LOY has the disadvantage of low productivity due to low speed winding and high rate of trimming in post process.

In addition, there is a method of manufacturing a heterosection yarn with nylon POY (Partially Oriented Yarn) (US Pat. No. 5,432,002), but the spinning speed can be produced at 3,700 ~ 5,000m / min, but there is a disadvantage that a post process is required.

Up to now, the FDY manufacturing method has not succeeded in producing less than 1.1 denier sectional yarns having excellent uniformity and dyeing uniformity.

In melt spinning, the fiber formation process becomes more unstable with fineness.

This is mainly the result of a sharp decrease in denier uniformity and uneven dyeing in the finished fabric.

The present invention aims to solve the problems of the prior art as described above and to provide a method for producing a nylon 6 triangular cross-section yarn by a simplified FDY method.

In addition, single yarn fineness in dyeing provides yarn that does not have the disadvantages of less than 1.1 denier cross section yarns, and provides a yarn that gives a very soft texture without bleeding from the processing fabric.

1 is a manufacturing process schematic diagram of the present invention.

Figure 2 is an enlarged cross-sectional view of the triangular cross-section yarn produced by the present invention.

Referring to Figure 1 in detail the manufacturing method of the present invention.

After melt spinning from the spinneret (1) of the triangular cross section, the yarns are cooled by a cooling wind of 0.4 to 0.5 m / sec in the cooling wind duct (2), and at a position of 90 to 110 cm directly below the spinneret (1). Impart emulsions.

Subsequently, the first gourd rollers 4 rotating at a speed of 3,900 to 4,600 m / min and the second gourd rollers 5 rotating at a speed of 4,500 to 5,200 m / min are stretched and stretched to be about 4,400 m / min. Winding loosely at speed produces a nylon 6 triangular cross-section.

If the speed of the cooling wind in the present invention exceeds 0.5m / sec, the flexibility and feel of the manufactured yarn is not good and the dyeing property is particularly poor, if less than 0.4m / sec can not obtain a yarn of uniform cross-section due to poor draw.

In addition, in the present invention, if the emulsion treatment position is less than 90 cm lacks the focusing ability of yarn yarns, causing stretching disorders, and exceeding 110 cm, poor spinning workability and poor gloss, flexibility and dyeing of the yarn.

In addition, in the present invention, the triangular cross-section yarn was about 1.6 to 1.7 so that the glossiness and touch were excellent.

If the mold release degree is less than 1.6, the glossiness of the yarn becomes poor, and if it exceeds 1.7, the gloss and dyeability are good, while the spinning workability is poor, and the flexibility and the touch are poor.

The present invention relates to nylon 6-shaped cross-section yarn having a triangular cross section, sulfuric acid relative viscosity 2.40 ~ 2.54, strength 4.7 ~ 5.3g / denier, elongation 41 ~ 48%, single yarn fineness is 1.1 denier or less cross-sectional shape This triangular cross section has excellent gloss and feel.

In addition, the degree of release was calculated as the ratio of the circumscribed circle diameter (a) to the circumscribed circle diameter (b), and the gloss and touch are particularly good at values of 1.6 to 1.7.

Example 1

As shown in Fig. 1, the nylon 6 filament having the triangular cross section is wound through the spinneret 1 after the first gourd roller, the second gourd roller, and the interlocking device.

The spinning process is as follows.

The first gourd roller and 4,500 were spun from a nylon 6 polymer with a relative viscosity of 2.47 at a spinning temperature of 260 ° C. and then cooled with a cooling wind of 0.4 m / sec to impart an emulsion at 100 cm below the spinneret and rotate at a speed of 3947 m / min. After passing through the second high speed roller rotating at a speed of m / min and wound at a speed of 4,413 m / min to produce a triangular cross-section of 70 denier / 68 filament.

The nylon 6 fibers thus prepared were knitted and then dyed into a single tissue in a circular knitting machine, and the glossiness and the touch were evaluated.

Example 2

Example 1 except that the speed of the first gourd roller was 4,561 m / min and the speed of the second gourd roller was 5,200 m / min and wound at 5,096 m / min. Prepared under the same conditions as shown in Table 1 the results.

Comparative Example 1

Except that the speed of the cooling wind was 0.6m / min was prepared under the same conditions as in Example 1 and the results are shown in Table 1.

Comparative Example 2

Except that the emulsification position was 120 cm under the spinneret was prepared under the same conditions as in Example 1 and the results are shown in Table 1.

Comparative Example 3

It is the same as Example 1 except having made mold release degree 1.5.

Comparative Example 4

It is the same as Example 1 except having made the mold release degree 2.

<Table 1>

Radiation workability Luster flexibility touch Dyeability Example 1 ◎ ○ ○ ○ ◎ Example 2 ○ ○ ◎ ◎ ○ Comparative Example 1 ○ ○ △ △ × Comparative Example 2 △ △ △ △ △ Comparative Example 3 ○ × ○ ○ ○ Comparative Example 4 △ ◎ △ × ○

◎: Very good (1 day trimming rate is 0.5 times or less for radio workability)

(Circle): Excellent (0.5 ~ 0.8 cutting rate per day for radio workability)

(Triangle | delta): Moderate (0.8-1.2 times of cut per day in the case of radioworkability)

X: Poor (in the case of radioworkability, the rate of cut per day is 1.2 or more)

The present invention is a method of manufacturing a nylon 6 triangular cross-section yarn by the FDY method can reduce the manufacturing cost by the simple process, and control the strength of the cooling wind, the location of lubrication and the degree of release to an appropriate level, as well as the gloss characteristics of the sectional cross-section yarn Nylon 6 triangular cross-section yarns can be produced with excellent flexibility, hand, and dyeability.

Claims (1)

A method for producing a nylon 6 triangular cross-section yarn, characterized in that the following conditions are all satisfied in manufacturing the nylon 6 yarn of the triangular cross section in a one-step process of melt spinning and stretching at a rate of 4,000 m / min or more. next 1. Cooling wind speed: 0.4 ~ 0.5m / s 2. Emulsion treatment position: 90∼110㎝ directly below the spinneret 3. Mold release degree: 1.6∼1.7