JPS61113811A - High-speed winding of thermoplastic synthetic fiber - Google Patents

Abstract

PURPOSE:To produce the titled fiber, stably, without causing end breakage and fluffing, by bending a melt-spun synthetic fiber yarn with plural guides to different direction at downstream side of the point where the yarn is separated from the last godet roller, and winding the yarn at a high speed under a specific yarn tension. CONSTITUTION:Molten polymer is extruded through the spinneret 1, passed through the atmosphere having controlled temperature by the heating cylinder placed just under the spinneret 1, cooled and solidified with the cooling air stream blasted from the cooling apparatus 3 at a definite flow rate, imparted with a lubricant with an oiler 4, and taken up with the godet rollers 5, 6. The first guide A for assisting the separation of the yarn from the godet roller is placed at the downstream side of the roller within 200mm from the point where the yarn is separated from the last godet roller 6. The yarn Y is bent by 5-60 deg. at the first guide A, and then bent by 5-45 deg. to the direction different from the above bending direction at the second guide B placed to the downstream side of the first guide A. The yarn is wound in the form of a package 7 at a speed of >=4,000m/min under a winding yarn tension of <=0.20g/d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for spinning and winding thermoplastic synthetic fibers at high speed. More specifically, the present invention relates to a winding method for improving the properties and package shape of high-speed winding sushi yarn.

[Prior art] In recent years, yarns spun from thermoplastic synthetic polymers such as polyamides and polyesters have been taken up at high speed and drawn, or wound at high speed without being drawn to produce intermediately oriented yarns or drawn yarns. things are being done. When a yarn wound at such a high speed is wound under high tension as in the case of undrawn yarn winding, the package form becomes extremely poor and the uniformity of the yarn quality becomes poor.

Therefore, it has been proposed that yarns to be wound at high speeds such as 4,000 m/min or more should be wound with a low tension of 0.20 to 30 g/d or less (Special Publication No. 58- 4
2284 Publication, Special Publication No. 58-46569, etc.)
.

However, as the winding tension decreases, it becomes more difficult for the yarn to separate from the godet roller (final godet roller) located just before winding, and the yarn separation point on this godet roller becomes unstable. This results in extremely poor convergence, and the yarn tends to wind backwards around the godet roller. As a result, this results in a decrease in yarn spinning stability, an increase in yarn breakage and fuzz, and a decrease in yarn quality due to the occurrence of single yarn drop and single yarn sag due to poor bundling.

In particular, when the winding tension is set to a low level such as 0.20 g/d or less, thread breakage and fuzzing become more frequent, making it difficult to stably spin the thread.

[Problems to be Solved by the Invention] Therefore, the present invention aims at reducing spinning stability and reducing yarn spinning stability when the melt-spun thermoplastic synthetic fiber yarn is taken up by a godet roller and then wound at a speed of 4000 m/min or more. The main purpose of the present invention is to provide a high-speed winding method that enables low-tension winding at a winding tension of 0.20 (1/d or less) without causing adverse effects such as deterioration of the quality of the strip. That is, The present invention provides a method capable of obtaining high-speed winding yarn with good yarn spinning stability and good yarn quality and package shape. [Means for solving problems and points] In order to achieve the object, the present invention provides for 40 minutes of melt-spun thermoplastic synthetic fiber yarn after being taken up to a godet roller.
In the method of winding at a speed of 00 m/min or more, the downstream side 20 from the yarn separation point of the final godet roller 6 immediately before winding.
A guide A for assisting yarn removal is provided within 0ml1,
The running yarn is bent by 5 to 60 degrees in the guide, and then the running yarn is bent in a different direction from the bending in the first guide in another second guide B provided downstream of the first guide.

The yarn tension is set to 0 when winding.
．． 20 (J/d or less), it consists of a high-speed winding method for thermoplastic synthetic fibers.

FIG. 1 (R schematic longitudinal sectional view) showing one embodiment of the method of the present invention,
The following description will be made with reference to FIG. 2 (an enlarged longitudinal sectional view of the vicinity of the final godet roller) and FIG. 3 showing an example of a guide used in the method of the present invention.

In FIG. 1, a molten polymer is spun out from a spinneret 1, passes through an atmosphere at a temperature controlled by a heating cylinder 2 provided directly below the spinneret, and is blown out at a constant speed from a cooling device 3. It is cooled and solidified by the cooling air, applied with oil by the oil supply device 4, taken up by the godet roller 5.6,
Next, after passing through the first guide A1 and the second guide B, it is wound up by a winding device (not shown) to form the package 7.

[Function] In order to make it easier for the traveling yarn to separate from the final godet roller 6, the present invention provides a
A first guide 8 for yarn separation assistance is provided within m, the traveling yarn is bent by 5 to 60 degrees at the first guide 8, and then another second guide provided downstream of the first guide A. At this point, the running yarn is bent by 5 to 45 degrees in a direction different from the bending at the first guide.

In this way, the running yarn separated from the final godet roller 6 is slightly bent by the first guide A and the second guide B, and then transferred to the winding device. It is also important to set the bending angles of these guides A and B and the distance to the first guide A to specific values.

If the bending angle θ1 of the running yarn in the first guide A is too large, even if a guide with low friction is used, the fiber JJ resistance between the guide and the yarn will be too large, leading to a decrease in quality due to abrasion of the yarn. If the bending angle θ1 is too large or too small, the instability of the yarn separation point on the final godet roller cannot be resolved. It is more effective to set the bending angle θ1 to 10 to 45 degrees.

If the distance (a) between the final godet roller 6 and the first guide A becomes too long, the effect of providing the first guide 8 will be drastically reduced.
Since it is not possible to eliminate the instability of yarn separation on the final godet roller, this distance (a) must be 200 mm or less, and preferably 1 m of 100-20o fibers.
It is. This distance 1ti(a) is, as shown in FIG.
This is the distance between the first guide A and the yarn separation point, which is represented as a point on the final godet roller where the yarn transfer direction to the first guide 8 is tangential. The optimal value of this distance (a) is
Diameter of final godet roller, bending angle at first guide A (θ
1) and the device space, etc., should be taken into consideration.

On the downstream side of this first guide A, another second guide B may be successively provided so that the bending angle (θ2) of the running yarn in this second guide B is 5 to 45 degrees. is necessary. If this bending at the second guide B is not performed, the winding position of the traveling yarn will be greatly different from that in the conventional method, and the method of the present invention cannot be easily carried out. Sufficient thread release properties! cannot be improved. The distance (b) between the second guide B and the first guide A is, for example, 50 to 6
It should be around 00111111, especially 100~
Approximately 300 mm is preferable.

The bending direction of the running yarn in the first guide A is not particularly limited, but in order to sufficiently prevent the yarn from winding backwards onto the final godet roller, it should be bent in the direction approaching the R final godet roller 6 as shown in FIG. 1.2. It is preferable. Furthermore, the direction in which the traveling yarn is bent in the second guide B may be different from the direction in which it is bent in the first guide, but as shown in FIG. It is preferable to bend the yarn so that it returns to the direction in which the traveling yarn is transported in the conventional method.

For these first guides A1 and second guides B, it is preferable to use guides made of ceramic or ceramic coated in order to prevent damage to the running yarn and wear of the guides.

In addition, in order to sufficiently improve the cohesiveness of running yarn, especially the yarn convergence in the width direction of the godet roller, □31i1
(I71..),,,□Youga,□□1U・1(
It is preferable to use a flexible guide such as a slit-like guide or a snell-like guide.

In this way, between the final godet roller and the winding device,
If a specific guide is provided to regulate the yarn path, the yarn separation point on the final godet roller will not become unstable even if the yarn tension during winding is set to a low level of 0.20 g/d or less. ,
It is possible to reduce the tension during winding without causing adverse effects such as a decrease in yarn spinning stability.

In addition, in order to prevent yarn slipping on the godet roller, a mirror-finished roller is suitable as the godet roller, but such a mirror-finished roller has poor yarn release properties, so a mirror-finished roller is used as the final godet roller. Conventionally, it has been difficult to reduce the tension during winding. However, according to the method of the present invention, if the thread path of the running yarn coming out of the final godet roller is regulated by a specific guide, even if a mirror-finished roller is used as the final godet roller, there will be problems such as instability of yarn reeling. It is possible to reduce the tension during winding without causing any problems.

In order to improve the uniformity of the package form and yarn quality, the yarn tension h at the time of winding must be less than 0.20 (J/d), but it can also be less than 0.15 g/d. Preferably.The tension at the time of winding is the same as that of the second guide B.
This is the yarn tension measured between the traverse fulcrum guide 8 and the traverse fulcrum guide 8.

[Example 1] Nylon 6 was melt-spun in a conventional manner, and as shown in FIG. 1, after cooling and oiling, the first godet roller had a surface speed of 4800 m/min.
Surface temperature: 200°C) After being taken up by a mirror-finished second godet roller and passed through the first guide A and second guide 8,
Winding, 70 denier, 24 filament nylon 6
A thread was obtained. Note that the first and second guides were slit-shaped guides shown in FIG. 3(A) whose thread welding portions were made of ceramic.

At this time, change the positions of the first and second guides in various ways,
The lowest limit winding tension (T) and the occurrence of single yarn drop and single yarn sagging in the resulting package were measured. In addition,
The minimum hoisting tension (T) is the minimum hoisting tension at which the final godet roller starts to wind backwards when the hoisting tension is gradually reduced. Measured below.

As can be seen from the results shown in Table 1, by providing two guides as specified by the method of the present invention, the minimum hoisting tension can be lowered to a level of 7 to 8 Q/d, and Since the occurrence of single yarn dropping and single yarn sagging in the package was also prevented, yarn spinning stability, yarn quality, and package form could be improved at the same time.

Table 1 No. Bending angle Distance Bending angle Distance Winding tension Single yarn Single yarn - Ω Low) "Rainbow L ±)2 (
T) Fall 2 heads and 1 degree
City Q/d % %Example 1
10140 10100 0.10 0 0
Example 2 40140 30100 0.12
0 0 Comparative Example 1 70140 40100
0.16 0 1.5 Example 3 40100
40100 0.12 0 0 Example 4
20200 10100 0.11 0
0 Comparative Example 2 20 250 10 100 0.
14 1.0 0 Comparative Example 3 20 300 10
100 0.16 1.5 1. ○ [Effect of the invention] According to the method of the present invention, thermoplastic synthetic fiber yarn with excellent yarn quality and package shape can be produced without impairing the spinning stability during high-speed winding of 40001/min or higher in the yarn spinning process. Articles can be obtained.

In addition, the guide used in the method of the present invention is effective in improving the yarn separation property on the final godet roller, so even when a mirror-finished roller is used as the final godet roller, winding can be performed without impeding yarn spinning stability. It is possible to reduce the tension at the time.

Although the method of the present invention is generally applicable to high-speed winding of thermoplastic synthetic fiber yarn, it is particularly effective for spinning polyamides such as nylon 6 and nylon 66.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal cross-sectional view showing an embodiment of the yarn reeling process according to the present invention, and FIG. 2 is an enlarged vertical cross-sectional view of the vicinity of the final godet roller in FIG. 1. FIG. 3 is a perspective view illustrating a guide shape used in the method of the present invention. 1: Spinneret 5.6: Godet roller 7: Package A; First guide B: Second guide Y: Running yarn

Claims (3)

[Claims] (1) In a method in which melt-spun thermoplastic synthetic fiber yarn is taken up to a godet roller and then wound at a speed of 4000 m/min or more, within 200 mm downstream of the yarn separation point of the final godet roller immediately before winding, A first guide for assisting yarn separation is provided, and the running yarn is
- 60 degrees of bending, and then, in another second guide provided downstream of the first guide, the running yarn is bent by 5 to 45 degrees in a direction different from the bending in the first guide, and
A method for high-speed winding of thermoplastic synthetic fibers, characterized in that the yarn tension during winding is 0.20 g/d or less. (2) The method for high-speed winding of thermoplastic synthetic fibers according to claim 1, characterized in that a mirror finish roller is used as the final godet roller. (3) The method for high-speed winding of thermoplastic synthetic fibers according to claim 1, characterized in that the first and second guides are ceramic or ceramic-coated guides.