KR100211143B1 - The preparing method and apparatus of polyester fiber - Google Patents

Abstract

The present invention is characterized by the use of the grooves satisfying the following equation on the first take-up roller in the production of polyester fiber at a spinning speed of 5,500m / min or more, and friction between adjacent threads by vibration during high-speed spinning It is effective in reducing trimming and improving uniformity by preventing dust and suppressing blurring in the discharge slope.

Where d is the fineness of the fiber (denier) on the take-up roller.

R: Radius of groove on take-up roller (mm)

V: spinning speed (m / min)

A: Spacing between draw roll grooves (mm)

Description

Method and apparatus for producing polyester fiber

1 is a schematic view of a spinning apparatus adopted in the present invention.

2 is a partial sectional view of a take-up roller showing the groove standard adopted in the present invention.

* Explanation of symbols for main parts of the drawings

1: spinning detention 2: release movement

3: oil supply device 4: cooling device

5: Takeover roller R: Radius of the takeover roller groove

A: Spacing of groove gap on take-up roller

The present invention relates to a method and a device for producing yarn stably without trimming with excellent uniformity by specially modifying the device in producing polyester fibers by a high-speed spinning method.

Spinning technology started as a low-speed spinning, undrawn (UDY) -stretching process, followed by the development of technology. Partially stretched (POY) -stretching process, then spinning technology started with a process of partial-stretching (POY) -stretching. Recently, there has been a step of producing a finished product by treating the direct-stretching as a single process without a separate stretching process, and such a method is known from US Patent 2,604,667 (1952) and US Patent 2,957,747 (1960). .

However, in the industrialization of such technology, it is a problem to stably radiate a product having an excellent leveling agent without trimming, and in particular, there is more difficulty in view of the recent trend of increasing the manufacturing speed to improve productivity.

In order to solve this problem, US patent 4,338,275 proposes a method of sequentially passing a heating part, a cooling part, and a reheating part by retrofitting a radiating facility, and Japanese Patent Application Publication No. 88-145406, 89-275706, etc. Although this method has been proposed, the reduction of trimming can be achieved to some extent, but there are disadvantages in that the properties such as poor leveling and elongation are not sufficient.

The inventors of the present invention have made a special form as a result of repeated research on the aspect of retrofit of the spinning equipment to solve the occurrence of trimming, poor uniformity and deterioration of physical properties, which are particularly problematic in producing polyester fibers at a spinning speed of 5,500 m / min or more. This was accomplished by developing and using a take-up roller having.

In high-speed spinning, the characteristic is that as the take-up speed increases, the air decreases and the draw tension of the yarn increases, and the increase in yarn tension causes the shake in the take-off roller as well as the shake in the discharge sand (spin line). This is due to the increase in speed and the fineness. In particular, the vibration on the take-up roller is caused by trimming, poor uniformity, and deterioration of properties due to friction with adjacent threads, and the above-mentioned problems are further increased because the shake on the take-up roller affects the emission slope.

The present invention improves these problems and draws after the thread 2 discharged through the spinneret 1 is cooled in the cooling device 4 and oiled in the oil supply device 3 as shown in 1-2. In the high-speed winding of the roller (5) by using specially designed grooved take-down rollers suitable for the shooting company's slope, the method of suppressing the shaking of the apostle on the take-up roller, that is, the thread (2) released from the spinneret (1) To make the groove of suitable size in the first take-out roller (5) to draw and cool by pulling the thread to pass each designated slope, and to grab each thread on the take-off roller to prevent friction between adjacent threads by shaking. It is to provide a polyester manufacturing method which has a great effect in reducing trimming and improving the evenness by suppressing the shaking in the emission slope.

That is, the present invention is characterized by forming a groove satisfying the following formula on the take-up roller in the high speed spinning at a take-up speed of 5,500 m / min or more using a conventional polyester melt spinning apparatus.

Where V is the spinning speed (m / min), d is the denier of the yarn being produced, and R is the radius of the groove ( ) And A are the spacing between the grooves ( ) Indicates.)

As shown in the above formula, that is, the radius R of the grooves must increase with increasing fineness, and the spacing A between grooves has to be widened with increasing fineness and in particular the spinning speed V.

If the radius (R) of the groove is smaller than the range indicated in the above formula, the friction between the thread and the roller is increased, so that the thread trimming is increased. If the radius R is greater than the range, the effect of suppressing the vibration is reduced. In addition, when the distance A between the grooves is smaller than the range indicated by the above equation, the thread trimming due to inter-triangle friction occurs a lot before and after the take-out roller.

The present inventors have been able to stably manufacture polyester fibers having excellent leveling agent without trimming when applying grooves to a take-up roller satisfying the above-mentioned formula through numerous experiments.

The present invention will be described in detail with reference to comparative examples and examples.

In the Comparative Examples and Examples, the radio workability and the leveling agent were measured and calculated by the following method.

(1) Spinning workability: Total number of trimming when working normally for one day in a four-end radiator.

(2) Leveling System: Using a leveling meter tester from Keikosaki, Japan

Fire speed: 100m / min

Measuring range: 12.5%

Measurement time: U% value measured under the condition of 3 minutes.

Comparative Example and Example

Using a polyester polymer having an intrinsic viscosity of 0.62, spinning temperature 290 ° C, spinnerets 36 holes, hole diameter 0.25 In the phosphorus condition, the discharge amount was adjusted to have a fineness of 75 to 150 deniers, and spinning was performed at a pulling rate of 5,500 to 6,500 m / min, and the physical properties thereof are shown in Table 1 below.

Here, Comparative Example 1 uses a conventional take-up roller without a groove, and Comparative Examples 2 to 4 use a take-out roller having a groove outside the range defined by the present invention.

Claims (2)

Polyester fiber characterized in that the grooves satisfying the following formula on the first take-up roller are used for producing the polyester fiber at a spinning speed of 5,500 m / min or more using a conventional polyester melt spinning apparatus. Manufacturing method and apparatus Where d is the fineness of the fiber (denier) on the take-up roller. R: Radius of groove on take-up roller ( ) V: spinning speed (m / min) A: the gap between the grooves on the take-up roller ( ) The polyester high-speed melt spinning apparatus of 5,500m / min or more, characterized in that the first take-up roller is provided with a groove that satisfies the formula of claim 1.