JPH01174610A - Direct spinning and drawing of polyester yarn - Google Patents

Abstract

PURPOSE:To solve problems such as yarn breakage, Uster yarn irregularity, dyeing spots and dyeing specks, by setting the surface roughness of an oiling roller, the tension of undrawn filaments before a taking-up heating roller and the width of the bundle of the undrawn filaments within specific ranges thereof, respectively. CONSTITUTION:An aqueous emulsion oil is imparted to undrawn filaments 2 with a textured oiling roller 4 having a surface roughness of 50-250Hrms and the tension of the bundle of the undrawn filaments 2 before a taking-up heating roller 7 is set at 0.03-0.50g/d. The width L of the bundle of the undrawn filaments on the roller 7 is adjusted with a bundle width-adjusting guide 6 so as to satisfy an equation of Nl/2<L<3Nl (l is the diameter of a monofilament in the undrawn filaments; N is the number of the monofilaments in the undrawn filaments) and the filaments are drawn between drawing rollers 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for direct spinning and drawing of polyester yarn.

[Prior Art] It is well known that a direct spinning/drawing method is used in the production of synthetic fibers, and in particular, in the direct spinning/drawing method for polyester yarn, in order to uniformly draw the undrawn yarn, There are many proposals for a method of preheating the glass to a temperature equal to or higher than Tg temperature rx<glass transition temperature) and then stretching it. For example, U.S. Patent No. 3,563,021 and Japanese Patent Publication No. 47-22
No. 650 and other publications propose a method of preheating and drawing an undrawn yarn using a steam injection method as a means for preheating the undrawn yarn. However, these methods require complicated equipment and are not easy to manage, so generally a preheated stretching method using heated rollers has been adopted, which requires simple manufacturing equipment and is easy to manage and operate. . However, even in these heated roller stretching methods, yarn breakage and yarn quality defects (Worcester yarn unevenness, streak spots, uneven dyeing) caused by non-uniform stretching have not been completely eliminated.

In addition, in recent years, there has been an increasing demand for ultra-fine fibers as products become more sophisticated, and for higher speeds in order to reduce manufacturing costs. Against the background of such technical requirements, a new manufacturing method that eliminates yarn breakage and yarn quality defects has become necessary.

[Problems to be Solved by the Invention] By the way, when speeding up and producing ultra-fine fibers using conventional manufacturing methods, the drawbacks of the past became more clearly apparent, making it impossible to achieve good production. These disadvantages are that increasing the tension of undrawn yarn due to high speed causes yarn breakage and Worcester yarn unevenness, and when applying oil with an oiling roller, an oil film with a conventional mirror finish (1 Hrms or less) oiling roller is generated. It is easy to crack, and the application of oil to the yarn is uneven, which causes yarn breakage and Worcester yarn unevenness defects due to the inability to uniformly preheat between each single yarn and in the yarn direction, which is important for uniform drawing. As the tension increases as the speed increases, problems such as thread breakage and increased Worcester thread unevenness defects arise. In addition, unless the condition of the undrawn yarn on the roller that is preheated for drawing is properly adjusted, problems such as single yarn breakage and Worcestershire yarn unevenness may occur.

The present inventors have conducted intensive studies with the aim of eliminating the above-mentioned yarn breakage and eliminating defects such as Worcestershire yarn unevenness, dyeing spots, and dyeing unevenness by uniform stretching in terms of yarn quality, and as a result, the present invention has been developed. It's arrived.

Means for Solving Problems c] That is, the present invention provides a direct spinning/drawing apparatus consisting of a spinneret, an oiling roller, a take-up heating roller, and a drawing roller, in which the surface roughness of the oiling roller is set to 50 to 250.
Hrms satin finish, the tension of the undrawn yarn before the take-up heating roller is 0.03 to 0.50 g/d, and the undrawn yarn yarn width L on the take-up heating roller is within the range of the following formula. This is a method for direct spinning and drawing of polyester yarn, which is characterized by:

However, L: Undrawn yarn on the take-up heating roller and its separation roller Ω: Single yarn diameter of undrawn yarn N: Number of single yarns of undrawn yarn The present invention will be further described in detail with reference to the drawings.

FIG. 1 is a process diagram showing one example of the direct spinning and drawing method of the present invention.

In Fig. 1, 1 is a spinneret, 2 is an undrawn yarn, 3 is a cooling and solidifying device, 4 is an oiling roller, 5 is a focusing guide, 6 is a yarn adjustment guide, 7 is a take-up heating roller, and 8 is a separating device. 9 is a stretching roller, 10 is a winder, and 11 is a package.

The undrawn yarn 2 discharged from the nozzle 1 is cooled and solidified by a cooling and solidifying device @3, and is applied with a water emulsion oil by an oiling roller 4.

The threading is regulated by a convergence guide 5, and the yarn is wound around a take-up heating roller 7 and a separation roller 8 through a yarn adjustment guide 6 that adjusts the pitch within the yarn and between the yarns, and then the yarn is heated to the temperature required for drawing. Preheat. Subsequently, it is guided to a stretching roller 9 and wound,
While the yarn is stretched at a predetermined stretching ratio between the take-up heating roller 7 and the stretching roller 9, heat setting is performed by the stretching roller 9. Subsequently, a package 11 is obtained by a winder 10. An interlacing nozzle or the like may be provided between the stretching roller 9 and the winding 110, if necessary, for the purpose of providing convergence between the yarns.

The first feature of the present invention is that the oiling roller has a surface roughness of 50 to 250 Hrms. By constantly cleaning the oiling roller surface to prevent surface oil film cracking, a mirror-finish oiling roller can form a uniform oil film, but it has the disadvantage of being prone to oil film cracking.

As a solution to this problem, we conducted various studies on the surface roughness of oiling rollers, and found that a surface roughness of 50 to 250 Hrms has the best oil film stability and allows for uniform application of oil.
In addition, due to the low frictional resistance with the yarn at high speeds, the tension can be kept low, and especially when used in production machines with multiple spindles, there are advantages such as the ability to stably and easily manage the oil film on the surface of the oiling roller. There is.

The second feature of the present invention is that the tension of the undrawn yarn entering the take-up heating roller is maintained at 0.03 to 0.500/d.

The best way to adjust the thread tension is to use an oiling roller installed under the mouth surface and variablely move it in the thread direction. Another adjustment means is a means of changing the take-up speed or a guide oiling method (for example, Japanese Patent Publication No. 59-26695).
etc. is also possible, but there is little flexibility in changing the pick-up speed,
In the guide oil supply method, the undrawn yarn yarn tension level is set to 0.0.
Even if it is maintained at 3 to 0.50 g/d, thread breakage and Worcester thread unevenness are likely to occur.

When applying oil with an oiling roller, it is necessary to suppress an increase in air resistance due to the wide thread inside the thread from below the mouth surface to the oiling roller. Therefore, as described above, an oiling roller (a focusing guide is provided directly below the oiling roller) is used as a yarn tension adjusting means that can be moved in the yarn running direction. If you want to suppress the tension,
Move the oiling roller close to the bottom of the mouthpiece.

Note that if the yarn tension is lower than 0.03 Q/d, yarn wobbling and yarn creases will occur on the take-up heating roller and its separation roller, and breakage will occur due to contact between the yarns on the take-up heating roller and separation roller. Threads are formed. Also, the yarn tension is 0.50 Q/d
If the tension is higher than that, thread breakage will occur due to excessive tension.

Therefore, the tension of the undrawn yarn entering the take-up heating roller needs to be in the range of 0.03 to 0.50 Q/d.

The third feature of the present invention is that the bundled state of the undrawn yarn on the take-up heating roller is specified. If the undrawn yarns are extremely concentrated on the take-up heating roller, problems such as fluff and yarn breakage due to single yarn holes can be solved, but on the other hand, uniform preheating of each single yarn becomes poor, Worcester yarn unevenness,
Quality defects such as streaks and uneven dyeing occur.

Therefore, in order to optimize this yarn convergence state, it is necessary to adjust the state to a range expressed by the following equation quantitatively.

However, L: Undrawn yarn on the take-up heating roller and its separation roller Ω: Single yarn diameter of undrawn yarn N: Number of single yarns of undrawn yarn In order to uniformly stretch the yarn by preheating it with a heating roller, each single yarn is run in parallel on the roller. It is important to regulate the width of the yarn by adjusting it with guides before the yarn enters the take-up heating row so that the width of the single yarn does not spread too much or bunch up too much. When L<(NΩ/2), uniform preheating of each single yarn becomes insufficient, and when L>3NΩ, problems such as fuzz and yarn breakage occur due to single yarn holes.

In the present invention, as shown in FIG. 1, it is preferable to provide a yarn medium adjustment guide 6 immediately before the take-up heating roller 7 to adjust the pitch between yarns in the yarn.

[Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

[η]-(165 polyethylene terephthalate to 29
It is melted at 0°C, discharged from a 100 mm diameter nozzle with 72 holes of 0.2 am diameter, and cooled in a cooling solidification device.
An oil agent (15% by weight conc. , after heat setting on the stretching roller,
I wound it up.

As an experimental level, experiments were conducted by changing the peripheral speed of the drawing roller, that is, the drawing speed, at 3000, 4000, and 500097 minutes, respectively, by changing the position of the oiling roller, the surface roughness of the oiling roller, and the yarn content on the take-up heating roller. , the processability and quality characteristics of each at this time are summarized in Table 1.

The discharge amount is 23°9 when the stretching speed is 300001/min.
g/min, 400097 minutes, 31.801 minutes, 500
In the case of 097 minutes, it was set as 39.7M minutes.

From the examples in Table 1, experiments Nα1 to 3 were conducted at a stretching speed of 300.
In the results of 0 m/min, Nα1 is a comparative example in which yarn breakage occurred frequently due to low undrawn yarn yarn tension when entering the take-up heating roller;
α2.3 is an example when adjusted within the range of 0.03 to 0.50 g/d according to the present invention, and there is no yarn breakage and the yarn quality is good.

Experiments Nα4 to Nα11 are the results at a stretching speed of 4000 m/min, and experiments Nα4.7.8 and 11 are comparative examples. N
α4 has oil film cracks due to the specular oiling roller surface, which causes uneven oil adhesion and yarn breakage, as well as yarn quality defects. N
In α7, the roughness of the oiling roller was too rough, and the single yarns were too dispersed on the surface of the oiling roller, causing single yarn breakage. In case of Nα8, the yarns were too bunched on the take-up heating roller, resulting in defects in yarn quality. In Nα11, the single yarn was too dispersed on the take-up heating roller and separation roller, causing yarn breakage.

On the other hand, in experiments Nα5.6.9 and 10, the adhesion of the oil to the yarn was good, the tension level was appropriate, and the undrawn yarn was bundled on the take-up heating roller and separation roller. This is an example in which the problems of yarn breakage and yarn quality defects were solved.

Na12 to 15 are the experimental results at a drawing speed of 50 Do m/min. This is an example showing good results with no yarn breakage or yarn quality defects.

[Effects of the Invention] The direct spinning and drawing method of the present invention eliminates operational problems such as fuzz and yarn breakage, and also eliminates quality problems such as Worcester yarn unevenness, streak spots, and dyeing. It is possible to increase the speed to a level of 4000 to 5000 m7 minutes and to efficiently produce ultra-fine products such as single yarn 1d.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing one embodiment of the direct spinning and drawing method of the present invention. 1: Spinneret 2-Undrawn yarn 3: Cooling and assimilation device 4: Oiling roller 5: Focusing guide 6: Yarn medium adjustment guide 7: Taking-off heating roller 8: Separating roller 9: Stretching roller 10: Winding machine 11: Package patent applicant Toshi Co., Ltd. Figure 1

Claims (1)

[Claims] In a direct spinning/drawing device consisting of a spinneret, an oiling roller, a take-up heating roller, and a drawing roller, the oiling roller has a matte surface roughness of 50 to 250 Hrms, and the undrawn yarn is placed before the take-up heating roller. Yarn tension 0.03~0
．． 50 g/d, and a method for direct spinning and drawing of polyester yarn, characterized in that the undrawn yarn width L on the take-up heating roller is drawn within the following range. Nl/2<L<3Nl where L: Width of the undrawn yarn on the take-up heating roller and its separation roller L: Single yarn diameter of the undrawn yarn N: Number of single yarns of the undrawn yarn