JPH06298453A - Winding method for elastic yarn - Google Patents

Abstract

PURPOSE:To reduce the residual shrinkage of elastic yarn by overfeeding the elastic yarn to a bobbin to wind the yarn to the bobbin at a speed a specific times or more of the winding speed by means of a driving roller installed behind a traverse, and making the speed of a taking godet roller equal to or greater than the winding speed. CONSTITUTION:To wind elastic yarn 1 onto a bobbin 6, the yarn is overfed to the bobbin 6 at 1.1 times or more of the winding speed, preferably 1.2 to 2 times of the winding speed by means of a driving roller 5 installed behind a traverse 8. Even if the speed of a taking roller 3 is equal to or greater than the winding speed, preferably 1.1 times or more of the winding speed, the tension of the yarn when the yarn is separated from a godet roller 4 is kept high and the yarn is guided to the driving roller 5 without being wound around other rollers, etc., and is then relaxed in a moment and wound. Thereby the yarn with a small residual shrinkage can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding elastic yarn such as polyurethane. More specifically, it relates to a winding method for reducing the residual strain of the elastic yarn.

[0002]

2. Description of the Related Art Generally, an elastic yarn such as polyurethane has a very large elasticity and a small rigidity, and the tension during spinning and winding is extremely small. Therefore, as a method of winding the elastic yarn,
JP-A-48-45642, 48-80838, 50
-76322, 50-112531, JP-A-02-7.
0675, 02-233471, 03-8667,
03-311380, 03-288769, 04
-354763, etc. have been reported, but these are related to an oil agent for preventing fusion of a package foam or a thread, a surface condition of a bobbin, an automatic switching method, etc. Does not prescribe. Further, as a driving roller after traversing, JP-A-54-8
8333, 56-103062, etc., but none of them relates to a method of winding an elastic yarn, and a drive roller is provided with a guide groove of a traverse to package the same.
The purpose is to improve the shape of the foam, and it is not intended to reduce the residual strain of the elastic yarn by the overfeed to the bobbin (rolling ball) using the driving roller.

[0003]

When winding an elastic yarn,
When wound in a state of high tension, the yarn is wound while stretched,
Residual shrinkage ratio (elastic deformation ratio of wound yarn, ie (denier of released yarn / denier on bobbin-1) x 1
00 (%)), resulting in yarn breakage and deterioration in physical properties (elongation, etc.) during processing of the yarn. However, when trying to wind with low tension by the conventional winding method, due to the resistance of the traverse or oiling, etc.
It will be wrapped around LA. Therefore, there is a problem in that the yarn must be wound in a state where the tension is high to some extent, and as a result, the yarn has a high residual shrinkage. Specifically, referring to FIG. 2, the faster the speed of the take-up godet roller 3 is compared with the speed of the take-up speed (the speed of the drive roller 5 and the speed of the bobbin 6 are the same), the faster the speed of winding. At that time, the tension of the yarn 1 becomes small, and the residual shrinkage rate can be lowered.
However, if the speed of the take-up godet roller 3 is increased to reduce the tension of the thread when wound, the oiling roller 7 may be wound around the take-up godet roller 3 due to the resistance of the oiling roller 7. Even if the speed of the second godet roller 4 is increased to prevent the godet roller 3 from being wound around, the godet roller 4 may be wound around the second godet roller 4 due to the resistance of the traverse 8. Therefore, it is practically impossible to raise the speed of the take-up godet roller to lower the residual shrinkage rate.

This phenomenon is caused by a yarn having a large elongation at a low tension such as a yarn having a small denier (for example, 20 denier or less) or a yarn having a small elastic modulus, or a high winding speed (for example, 700 m). / Min or more).

[0005]

According to the present invention for solving the above problems, when winding an elastic yarn on a bobbin, a drive roller installed after the traverse causes a winding speed of 1.1. Over the bobbin (rolling ball) at double speed
The winding method is characterized in that the speed of the take-up godet roller is made equal to or more than the winding speed by feeding.

The present invention can be applied to various elastic yarns,
Preferably, polyurethane elastic yarn, more preferably,
It can be applied to spandex composed of a long-chain polymer compound containing 85% or more polyurethane. The denier of the elastic yarn used is preferably 40 denier or less, more preferably 10 denier or more and 20 denier or less.

The invention is illustrated in more detail in FIG. The present invention is a drive roller installed after the traverse 8.
The winding speed is 1.1 times or more, preferably 1.
By overfeeding the bobbin at a speed of 2 to 2 times, the speed of the take-up roller 3 is taken up.
Even if the speed is equal to or higher than the speed, preferably 1.1 times or more, the thread tension at the time of pulling apart the godet roller is kept high, and the thread is guided to the drive roller without being wound around the roller in the middle, and thereafter. Characterized by relaxing and winding in an instant,
It is a method of winding an elastic yarn.

According to the present invention, as long as the yarn has the same physical properties, it is possible to obtain a yarn having a similar residual shrinkage rate even if the winding speed is different. In the conventional method, the residual shrinkage rate of the yarn increases as the winding speed increases, whereas in the present invention, the residual shrinkage rate is almost constant, so the higher the winding speed, the greater the effect of the present invention. Can be said.

[0009]

EXAMPLES The present invention will be described below with reference to examples. However, the present invention is not limited to this embodiment.

[0010]

EXAMPLE 1 20 denier polyurethane fibers were wound at a winding speed of 800 m / min by the conventional winding method (FIG. 2) and the winding method of the present invention (FIG. 1). The spinning conditions other than the winding method are the same. In the conventional method, as shown in FIG. 2, the yarn 1 twisted by the false twisting machine 2 is taken up by a godet roll.
After passing through LA, oiling with oiling roller 7
After passing through the godet roller 4, it is traversed by a traverse device 8 and wound on a bobbin 6. At this time, the driving roller 5 is used as a surface roller for keeping the bobbin at a constant peripheral speed, and the bobbin speed and the driving roller speed are the same.

As shown in FIG. 1, the method according to the present invention, after the traverse 8, the driving roller 5 turns the bobbin 6 on.
After the bar feeding, the bobbin 6 is instantly relaxed and wound up. By both methods, an attempt was made to raise the speed of the take-up godet roller 4 to reduce the residual shrinkage rate. Table 1 shows the result of the limit of stable operation without winding the yarn around the roller.

[0012]

Example 2 Similar to the case of Example 1, the case of winding 20 denier polyurethane fiber at 1000 m / min was also carried out. The results are shown in Table 2.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

According to the winding method of the present invention, even if the speed of the take-up godet roller is raised, it can be wound without winding around the roller in the middle, and as a result, the residual shrinkage ratio is obtained. It is possible to obtain small yarns. In addition, if the yarns have the same physical properties, it is possible to obtain the yarns having a similar residual shrinkage ratio regardless of the winding speed.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a winding method according to first and second embodiments of the present invention.

FIG. 2 is a schematic view of an example of a conventional winding method.

[Explanation of symbols]

 1 elastic yarn 2 false twisting machine 3 take-up godet roller 4 second godet roller 5 drive roller 6 bobbin (rolling ball) 7 oiling roller 8 traverse device 9 surface roller (or nip roller) )

Claims (1)

[Claims] 1. When winding an elastic yarn on a bobbin, a driving roller installed after the traverse causes the ball to move to the bobbin (rolling ball) at a speed 1.1 times or more higher than the winding speed. A winding method characterized in that the speed of the take-up godet roller is made equal to or higher than the winding speed by carrying out the bar feeding.