KR20000041568A - Process for producing melt spinning spandex yarn - Google Patents

Abstract

PURPOSE: A process for producing a melt spinning spandex yarn is provided which has improved winding property and physical property by using a mass cooling equipment. CONSTITUTION: A spandex yarn is prepared by spinning a melt spinning yarn through a spinning base and then transporting the melt spinning yarn in the quenching portion. An equipment for producing the melt spinning yarn is comprised of an extruding machine, a spinning head, a spinning pack, a quenching stack, a first godet roller, a second godet roller and a take-up motion. A resin for spandex yarn is polyurethane resin. The polyurethane resin is comprised of polytetramethyleneesterglycol, methlylenediisocyanate and butanediol as chain extender, and has a hardness of 80A and mass average molecular weight of 350,000.

Description

Manufacturing method of melt spun spandex

The present invention relates to an apparatus for manufacturing melt spun spandex, and more particularly, to a method for manufacturing a melt spun spandex having improved winding property and physical properties by improving a solidification defect occurring in a tide denier of 200 denier or more during spandex production. .

Spandex prepared by melt spinning thermoplastic polyurethane resin in a conventional manner, for example, is simpler to manufacture than dry and wet spinning by using no solvent, and has the advantage of lower manufacturing cost than dry and wet spinning. have.

However, the melt spinning spandex has a single hole circular cross-section, so there is no problem of solidification during spinning of the denier, but as the denier increases and the discharge speed increases, the solidification becomes poorer. Problems such as poor process, deterioration of the winding due to the formation of the winding winding and consequent deterioration of physical properties.

Basically, in the case of melt spinning of polyurethane, the solidification of urethane is poor compared to polyester, so it is quenched at a low temperature of 20 ° C. However, even if the low temperature quenching conditions suitable for basic urethane spinning were applied, the above problems could not be solved in the case of tadenier.

In order to solve the above problems, the present inventors have designed a multifilament bonded nozzle that improves the monohole nozzle to improve the solidification of the cap bottom of the melt-spun spandex to improve the solidification and other radioactivity of the bottom surface of the spin pack. (See Patent Application No. 95-40078). However, the improvement of solidification by this method was effective in less than 200 denier, but in the case of more than 200 denier, the increase of odd number due to the increase of denier resulted in the reduction of the hardenability of the lower part of the cap and the filament deviation due to the poor adhesion of mono holes. Problems such as occurred. This phenomenon appeared to be a more serious problem as the discharge speed was increased to increase productivity.

Therefore, the present inventors have attempted to find a variety of methods such as lowering the cooling temperature than the existing conditions or increasing the cooling air volume in order to solve the problem of the solidification failure. However, lowering the cooling temperature by 2 ~ 3 ℃ could not be expected to increase the solidification effect. When lowering the cooling temperature below 5 ℃, the cost of equipment increased due to the increase of cooling auxiliary equipment. In addition, the method of increasing the cooling air volume increases the speed of the cooling air in the spinning cylinder, resulting in the shaking of the yarn inside the spinning cylinder, resulting in a problem of lowering the uniformity of the final yarn due to the firing phenomenon.

Therefore, it is inevitable that the cooling zone should be long as shown in FIG. However, such an increase in facilities is accompanied by problems such as an increase in equipment costs and equipment space, and loses economic feasibility.

Therefore, the present invention is to solve the solidification phenomenon that occurs during the melt spinning of the tadenier in the manufacturing of the above-described spantex, to produce a melt-spun spandex with improved winding properties and physical properties.

In the study of the present inventors to solve the above problems, by moving the molten yarn from the quenching zone to the upper and lower zigzag in the quenching zone to increase the cooling residence time, even in the case of tadenier can be sufficiently cooled without lengthening the quenching zone As a result, it has been found that the spandex yarn having improved winding property and physical properties can be manufactured without causing the problem of the solidification as described above.

1 is a device diagram schematically showing a conventional melt spinning equipment

FIG. 2 is a schematic view of an apparatus for smelting spinning that increases cooling residence time by placing rollers in a quenching zone in accordance with a preferred embodiment of the present invention.

※ Explanation of code about main part in drawing ※

1: extruder

2: spinning head

3: spinning pack

4: quench stack

5: the first roller

6: second high roller

7: winder

Therefore, according to the present invention based on the finding of the above fact, in manufacturing the spandex fibers by melt spinning, the molten spinning yarn formed through the spinneret is moved from the quenching zone to zigzag to increase the cooling residence time. Provided is a method for producing melt spun spandex yarn.

In addition, the method is characterized in that the zigzag movement of the molten spinning yarn in the quenching region through the two or more rollers.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is an apparatus diagram for explaining a method for producing melt-spun spandex yarn according to a preferred embodiment of the present invention.

In the apparatus of FIG. 2, the resin for making spandex is melt-spun through a spinning nozzle surrounded by a spinning pack 3 via an extruder 1 and a spinning head 2, and the melt spinning yarn is quenched. It cools and solidifies while passing 4). As the molten yarn passes through the quenching stack (4), it is guided to the upper and lower zigzag in the quenching area through the first roller (5) and the second roller (6) arranged up and down, and then cooled and solidified to the winding machine (7). Is wound up by. Through such an apostle in the quenching zone, the cooling residence time can be nearly tripled. In the quenching region, the positions of the first and second rollers 5 and 6 arranged above and below the cooling residence time can be changed to be appropriately adjusted.

By using the present invention as described above, the residence time of the spandex yarn in the quenching zone can be sufficiently cooled without further lengthening the length of the quenching zone, thereby causing a problem of solidification failure even in the case of tadenier. Without this, it becomes possible to manufacture spandex yarn with improved winding properties and physical properties.

In the present invention, the first and second rollers (5, 6) is preferably composed of first and second gourd rollers, and the resin for spandex yarn is made of any resin well known in the art. Although especially good among them, a polyurethane resin is especially effective.

Spinning nozzles are more effective in improving the solidification than using multifilament bonded nozzles rather than mono holes.

Hereinafter, the present invention will be described in more detail by way of examples. However, the present invention is not limited by the following examples.

<Example 1>

A thermoplastic polyurethane resin, polytetramethylene ester glycol (PTMEG) and methylene diisocyanate (MDI), and a chain extender made of butanediol (BD) using a hardness (measured by the Shore hardness meter) 80A and a weight average molecular weight of 350,000 Was used.

The resin was melt spun at a discharge rate of 12.4 g / min and a discharge speed of 800 m / min in the apparatus of FIG. 2 to wind a 140 denier spandex yarn.

The spinneret used a multifilament bonded nozzle in which four filaments passed through a four-hole nozzle having a 0.3 mm hole were joined together at the bottom of the pack. The quench stack was 1.6m long and was able to supply 18 ° C air. The rollers installed inside the quench stack were the first and second gourd rollers.

In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

<Example 2>

In the same facility as in Example 1, 210 denier spandex yarns were wound at a discharge amount of 18.6 g / min and a discharge speed of 800 m / min. In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

<Example 3>

In the same facility as in Example 1, 420 denier spandex yarns were wound at a discharge rate of 37.3 g / min and a discharge speed of 800 m / min. In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

Comparative Example 1

The same procedure as in Example 1 was repeated except that the length of the quenching zone was 2.6 m and the first and second gouge rollers were used outside the quenching zone. In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

Comparative Example 2

The same procedure as in Comparative Example 1 was repeated except that 210 denier yarns were wound at a discharge rate of 18.6 g / min and a discharge speed of 800 m / min. In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

Comparative Example 3

The same procedure as in Comparative Example 1 was repeated except that 420 denier yarns were wound at a discharge rate of 37.3 g / min and a discharge speed of 800 m / min. In this example, the solidification property and the roll forming property were evaluated, and the properties of the wound spandex yarn were measured. The evaluation and measurement results are shown in Table 1 below.

division Yarn Denier Speed (m / min) Chiller length (m) Cooling wind temperature (℃) High Mars Winding formation Properties Remarks Strength (g / d) Elongation (%) Example One 140 800 1.6 18 Good Good 1.4 420 2 210 800 1.6 18 Good Good 1.3 490 3 420 800 1.6 18 Good Good 1.3 540 Comparative example One 140 800 2.5 18 Good Good 1.4 440 2 210 800 2.5 18 Bad Bad 0.8 550 Winding winding 3 420 800 2.5 18 Bad Bad 0.8 550

As described above, according to the present invention, the solidification phenomenon can be prevented without increasing the cost incurred in increasing the size of the cooling apparatus to increase the cooling effect, and the production of the melt-spun spandex with improved winding property and physical properties becomes possible.

Claims (2)

The method for producing the spundex fiber by melt spinning, wherein the melt spinning yarn formed through the spinneret is moved to the zigzag in the quenching zone to increase the cooling residence time. The method of claim 1, wherein the zigzag movement of the molten spinning yarn in the quenching zone is performed through two or more rollers.