JPS60104516A - Manufacture of polyester filament - Google Patents

Abstract

PURPOSE:To prevent the oscillation of a yarn on a hot feed roller, to eliminate the end breakage and the size deviation, and obtain the titled filament free from dyeing speck, by attaching a tension controller of the yarn before the hot feed roller, controlling the yarn tension to a specific level, and carrying out the hot drawing of the yarn. CONSTITUTION:The undrawn yarn 2 of a polyester, etc. composed of ethylene terephthalate as main recurring unit, is oiled with the oiling apparatus 3. The tension of the yarn is adjusted to 0.03-0.06g/d with the tension controller 4, wound plural turns around the hot feed roller 5 and the separate roller 6, drawn with the drawing rollers 7, 8, set with heat, and wound with the winder 9 to form the package 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing polyester filaments using a direct spinning drawing method.

[Prior art and its problems] The direct spinning and drawing method is well known as a method for producing synthetic fibers, and has been widely adopted in production.

For example, as a direct spinning drawing method for polyethylene terephthalate filaments, US Pat. No. 3,452,132
-1- ^ shown in l"ig, 1 in the specification
The filaments discharged from the nozzle are collected, coated with oil, and guided at a constant speed to a supply roller that supplies the yarn to a drawing roller. Subsequently, the material is guided to a stretching roller, stretched between a supply roller and a stretching roller at a desired magnification, heat-set on the stretching roller as necessary, and then guided to a winder to form a package. This is a method for manufacturing yarn.

Generally, when drawing polyester, a uniform drawn thread can be obtained by preheating the undrawn thread to around the glass transition temperature and then drawing it. This effect is the same in the direct spinning and drawing method, and there are many methods in which preheating of the yarn before drawing is performed using a feeding row.

The present inventors have also investigated a direct spinning/drawing method using preheated drawing using heated supply rollers, but encountered the following drawbacks. That is, when the undrawn yarn discharged from the spinneret is heated to a temperature close to the glass transition temperature (65 to 80'C) necessary for uniform drawing,
The tension decreases due to the relaxation of the orientation stress that occurs during spinning.
Addition = 2 = The yarn fluctuation on the heat supply roller or the separate roller (SR) for multiple windings provided to increase the preheating time becomes large, and the yarn on each day - SR is undrawn yarn. Since the strength is low, single yarn breakage and yarn breakage easily occur due to contact between yarns, resulting in fuzz and problems in yarn spinning.

Further, if the yarn sway on the heating supply roller is large, yarn unevenness will occur during stretching, resulting in quality deterioration such as Worcester percentage (0%) and dyeing unevenness. In the multi-filament simultaneous drawing method in which multi-filament threads are drawn using a single set of rollers for the purpose of cost reduction, prevention of thread breakage is the biggest issue, especially for thick denier varieties with drawn single threads of 3D or more, which require heating and supply. The yarn wobbling on the rollers has become large, and various studies have been conducted to suppress this yarn wobbling.

One of the conventional methods of suppressing yarn wobbling was to lower the temperature of the heating supply roller, but although lowering the humidity reduced the yarn wobbling, it resulted in poor quality, such as uneven dyeing due to uneven stretching.
There were two drawbacks.

Further, in the method of increasing the distance between the yarns by using a long heating supply roller, the rotational vibration of the roller increases and it is not effective in suppressing the yarn wobbling on the roller.

[Object of the Invention] It is an object of the present invention to eliminate the above-mentioned drawbacks and to prevent yarn wobbling on the heating supply roller without causing quality deterioration.

[Structure of the Invention] That is, the present invention provides a direct spinning/drawing method in which a yarn tension adjustment device is installed in front of the heating supply roller to reduce the tension to 0.03.
Ilf of a polyester filament characterized by heating and stretching after adjusting the tension to ~0,06 (1/d)
There are 31 methods.

Hereinafter, the present invention will be explained in more detail using the figures.

FIG. 1 is a schematic front view of a direct spinning/drawing apparatus showing one embodiment of the present invention, and FIGS. 2 and 3 are schematic front views showing main parts of other embodiments of FIG. After applying a lubricant to the undrawn yarn 2 discharged from the spinneret 1 using a lubricating device 3 and regulating the tension of the yarn 3 using a tension adjusting device 4, the undrawn yarn 2 is wound around a heated supply roller 5 and a separate roller 6 multiple times. After stretching with stretching rollers 7.8 and heat setting, a package 10 is formed by a winder 9.

In Fig. 1, it is necessary to set the tension of the yarn at the inlet X of the heating supply roller to 0.03 to 0.06 (]/d. When heating with If the tension exceeds 0.06 o/d, the strength and elongation will deteriorate and fuzz will occur.

From these results, the tension of the yarn at the entrance of the heating supply roller should be adjusted to 0.03 to 0.06 g/d in order to prevent yarn breakage by suppressing yarn wobbling, deterioration of strength and elongation, and prevention of fuzz. is necessary.

As for the tension adjustment method, one guide (see Fig. 1, 4) is used.
) or a combination of a plurality of rollers (FIG. 2, 41), the tension may be adjusted, or rollers may be inserted (FIG. 4, 42). What is important is to maintain the tension at the inlet of the heating supply roller at 0.03 to 0.060/d.

In the present invention, a remarkable effect is particularly exhibited in a variety of products in which the single yarns constituting the drawn yarn have a thick denier of 3 d or more.

The polyester of the present invention is mainly a polyester having dilene terephthalate as a main repeating unit, but may also be a polyester having butylene terephthalate as a repeating unit.

Moreover, it may be a polyester copolymerized with one or more other components in an amount of 15 mol % or less, and a polyester containing an additive for dental implants.

In the present invention, due to equipment restrictions, the spinning take-off speed is 2000 m/
It is effective for thick denier varieties that are smaller than 100 cm.

[Effects of the Invention] As described above, the present invention was able to suppress yarn wobbling on the heating supply roller, and was able to reduce single yarn breakage and yarn breakage without deteriorating yarn quality.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.635 was directly spun and drawn using the apparatus shown in Figure 1 under the following conditions.
0d -48f filament is 19.

Oil composition/concentration: Fatty acid ester synthetic oil, 15% by weight Oil adhesion amount: 1.0% Pick-up speed by heated supply roller: ...750 m/min Heat supply roller temperature...105℃ Stretching magnification...
・・・・・・・・・ 4.0 Stretching speed・・・・・・
...... 3000 m/minute Discharge hole...0. 2 0 mm + φ mouthpiece outer diameter 1 0 0 mm φ
Distance between the mouthpiece surface and the heated supply roller...8m Regarding the processing conditions and physical properties of the obtained filament, see
As shown in the table.

Table 1 As is clear from Table 1, in Experiment No. 002.3, there was little yarn wobbling or yarn breakage on the roller, and no decrease in strength and elongation was observed.

Example 2 Dimethyl (5-sodium sulfo) isophthalate at 1
．． A 5 mol % copolymerized polyester having an intrinsic viscosity of 0 (305) was directly spun and drawn using the apparatus shown in FIG. 2 under the following conditions to obtain filaments of 310d-96f.

Oil composition/concentration: Fatty acid ester synthetic oil, 15% by weight Oil adhesion: 1.0% Take-up speed by heated supply roller... ...610 m/min heating supply roller wetness...105℃ stretching magnification...
・・・・・・・・・ 4.1 Stretching speed・・・・・・
...... 2500 m/minute Discharge hole...0. 2 On + n + φ mouthpiece outer diameter 1 0 0 mm φ
Distance between the mouthpiece surface and the heating supply roller...8m The processing conditions and physical properties of the obtained filament are described in the second section.
As shown in the table.

8-Table 2 As is clear from Table 2, there was less yarn wobbling and yarn breakage in Experiment No. 6 and 70-La, and no decrease in strength and elongation was observed.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a direct spinning/drawing apparatus showing one embodiment of the present invention, and FIGS. 2 and 3 are schematic front views showing main parts of other embodiments of FIG. 1: Base 2: Undrawn yarn 3: Oil supply device 4.41.42: Tension control I device 5: Heating supply roller 6: Sebaret 1-roller 7.8: Stretching roller 9: Winding machine 10: Package patent applicant Toshi Co., Ltd. 11-

Claims (1)

[Claims] In the direct spinning and drawing method, a yarn tension adjustment device is installed before a heating supply roller to adjust the tension to 0.03 to 0.06 a/d, and then heating and drawing is performed. Method.