JPS6244044B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a winding method for direct spinning and drawing of polyester yarn. [Prior Art and its Problems] Generally, in the direct spinning drawing method, yarn is wound up by keeping the yarn tube horizontal and winding it up while applying pressure to a friction roller. The diameter of the thread tube used was 80 mm or more due to factors such as friction roller and surface adjustment during winding, rotational performance of the thread tube holder shaft, and vibration of the thread tube itself. By the way, when winding with a large-diameter yarn tube like this, the creel space is narrow for warping purposes, so it is usually re-wound onto a small-diameter yarn tube of about 60 mmφ or less for ring twisting machines, called a bobbin, and used for warping. was. On the other hand, in the direct spinning and drawing method, the winding speed is 2000~
Since it reaches over 4000 m/min, it is impossible to wind it with a normal ring twisting machine. From these viewpoints, for example, Japanese Patent Application Laid-Open No. 48-96808 proposes a winding method that does not use a ring twisting machine. However, this proposed method has drawbacks such as fabric quality defects such as slits in the winding body (hereinafter referred to as pirn), poor pern form, and unstable winding due to fluctuations in winding tension. [Purpose of the Invention] Therefore, the present inventors have made extensive studies to eliminate these drawbacks, and as a result, in the direct spinning and drawing method using heated rollers, using a bobbin with a diameter of 60 mm or less, pern marks can be formed on the fabric. They discovered a new method that allows for stable high-speed winding with good perforation. [Structure of the Invention] That is, the present invention provides a method for direct spinning and drawing.
When winding up the yarn, the final roller is a heated matte roller, and between the final roller and the winding device
This is a method for winding polyester yarn, which is characterized by relaxing the yarn at a relaxation rate of 0.5 to 1.5% and winding it without twisting into a yarn tube having a diameter of 60 mmφ or less. However, relaxation rate = final roller peripheral speed - hoisting speed / final roller peripheral speed x 100 The present invention will be explained below with reference to the drawings. FIG. 1 is a process diagram showing one embodiment of the present invention. In FIG. 1, after the yarn 2 coming out of the spinneret 1 is cooled and solidified, it is applied with a lubricant in an oil supply device 3, and is simultaneously drawn by a supply roller 4 and a heated drawing roller 5. heat set,
The yarn passes through a traverse guide 7 and is wound up by a yarn winding machine 8. At this time, the yarn tension is detected by the tension detector 6, and the speed is adjusted via the winding machine frequency converter 9 so that the yarn is wound at a constant tension. At this time, the important thing is to lower the winding speed than the final stretching roller circumferential speed and wind it in a relaxed state. In order to wind the yarn stably in a relaxed state, the final roller must be heated, and the roller surface must have a satin finish rather than a mirror surface, otherwise yarn wrapping will occur and the yarn cannot be wound stably. Cannot be rolled up. As the degree of winding relaxation increases, the stretch tension ΔT(g) decreases and quality defects such as pern are less likely to occur on the fabric, but disadvantages include increased yarn sway on the stretching roller and extreme A common case is the phenomenon in which the yarn wraps around the roller. What is the stretch tension ΔT(g) referred to here? As shown in Figure 2, a yarn wound on a bobbin is unwound and run while being stretched by 1.2% with two sets of non-heated rollers, and the tension at this time is The maximum tension of the pirn taper part (Fig. 2 R) is set as T ₁ (g), and the tension of the pirn straight winding part (Fig. 2 S) is set as T ₂ (g).
Let the difference between T ₁ (g) and T ₂ (g) be ΔT(g). Stretch tension Δ correlated with pernbake on fabric
It is important to set the relaxation rate within a range that satisfies both the reduction in T(g) and the stable winding of the yarn. According to the results of studies conducted by the present inventors, this relaxation rate is 0.5 to 1.5.
% was found to be the best. That is, if the relaxation rate is less than 0.5%, the pern form deteriorates and fabric quality defects called pern smudges occur. Furthermore, if the relaxation rate exceeds 1.5%, the yarn becomes slack between the final drawing roller and the winding machine, causing yarn breakage, resulting in poor operability. Therefore, it is important that the relaxation rate is 0.5 to 1.5%. In the above embodiment, a stretching roller is used as the final roller, but a processing roller for developing crimp may also be used. The yarn winding machine 8 according to the present invention is equipped with one drive source motor on one spindle, and detects yarn tension with a tension detector 6 and converts it into an electric signal. The yarn is wound onto the bobbin while adjusting the speed of the drive source motor via the winding machine frequency converter 9. A system may also be used in which a single drive source motor rotates a plurality of spindles. The pirn type is performed by passing the yarn through a traverse guide 7 and reciprocating the traverse guide in the axial direction of the bobbin. To wind up both ends of the pirn in a tapered shape, the reciprocating distance of the traverse guide may be gradually changed from the beginning of winding to the end of winding. Since a ring or a traveler is not used, twisting cannot be imparted, so an interlacing device may be provided to appropriately bundle the yarn before the yarn enters the winding machine. In particular, the present invention is useful in stretching using heated rollers. In other words, the relaxation rate is set to 0.5 to 0.5 as described above.
1.5%, but unless a heating roller is used, there will be a lot of yarn wobbling just before the winding machine, making it unstable and making stable winding difficult, making it impossible to achieve the effects of the present invention. In particular, heating the final stretching roller to give the roller surface a satin finish provides excellent effects in terms of quality and operability. On the other hand, if the bobbin size is 60mmφ or more,
When suspended on a warping machine, there is an inconvenience that there is a limit to the amount of bobbin winding. [Effects of the Invention] As detailed above, in the present invention, there is no problem of operability due to yarn wrapping around the drawing roller, and the diameter of the drawing roller is 60 mm.
It is possible to stably wind a bobbin of φ or less at a winding speed of 2000 m/min or more, and it is also possible to use a conventional creel for warping machines as is, and the quality is extremely high without the drawbacks of warping. It was confirmed that this is an excellent winding method. Hereinafter, the effects of the present invention will be shown in Examples. Example 1 A polyethylene terephthalate polymer with an intrinsic viscosity of 0.65 was discharged at 27 g/min per minute from a nozzle with a hole diameter of 0.23 mmφ and 24 holes to form a thread, and 1.0 wt% of water-based emulsion oil was added to it, and after stretching and heat setting. , 50D by changing the winding relaxation rate as shown in Table 1.
-24f drawn yarn was wound onto a 50mmφ bobbin, and the results are shown in Table 1. The peripheral speed of the supply heating roller 4 is 2000 m/min.
Temperature: 85°C, 7 turns, peripheral speed of the final roller, stretching roller 5, 5000 m/min, temperature: 135°C, 5 turns.
It was stretched 2.5 times.

[Table] Experiment Nos. 1, 2, 5, 6, 8, and 9 are comparative examples for clarifying the effects of the present invention. As is clear from Table 1, in Experiment Nos. 1 and 2, the winding relaxation rate was low, pern marks occurred on the fabric, the quality was poor, and the pern form was also poor. In Experiments Nos. 8 and 9, the winding relaxation rate was too high, and the yarn just before the winding machine became slack, making stable winding difficult. Furthermore, in Experiment Nos. 5 and 6, the results were obtained when the stretching roller was not heated and the surface finish of the stretching roller was mirror finished, but good results were not obtained in terms of fabric quality and winding property. On the other hand, in Experiment Nos. 3, 4, and 7, the stretching and winding conditions were good, the stretch tension ΔT(g) was low in terms of yarn quality, and no quality defects such as pern were observed on the fabric. Ta.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing one embodiment of the present invention. FIG. 2 shows an example of a chart for explaining the stretch tension measured by unwinding the yarn after winding it onto a bobbin. 1... Spinneret, 2... Yarn, 3... Oil supply device, 4...
Supply roller, 5... Stretching roller, 6... Tension detector,
7... Traverse guide, 8... Yarn winding machine, 9... Frequency converter for winding machine, S... Straight part of pirn, R... Tapered part of pirn.

Claims (1)

[Claims] 1. In the direct spinning drawing method, when winding the yarn, the final roller is a heated matte roller, and the yarn is relaxed between the final roller and the winding device at a relaxation rate of 0.5 to 1.5%, and the diameter is A method for winding polyester yarn, which is characterized by winding it without twisting onto a yarn tube of 60 mmφ or less. However, relaxation rate = final roller circumferential speed - hoisting speed / final roller circumferential speed x 100