JP2001130832A - Method for winding elastic yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for winding elastic yarn, allowing winding in good shape and preventing troubles such as end breakage from a surface layer to an innermost layer during unwinding work for aftertreatment even at a high speed. SOLUTION: When an elastic yarn after spun is wound into a cheese shape, an average twill angle A1 in a certain time T1 after starting winding is set within 0.7A0<=A1<=0.95A00.02T0<=T1<=0.10T0 and the yarn is then wound at a set twill angle A0 until a full wind time T0 is reached.

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 an elastic yarn such as polyurethane or polyetherester, and more particularly to a method for unwinding a yarn when unwinding an elastic yarn wound in a cheese shape. The present invention relates to a winding method with less trouble such as dropping.

[Prior art]

[0002] When an elastic yarn such as polyurethane, polyetherester or the like is wound up, troubles such as yarn breakage and twill drop easily occur when unwound. For this reason, these elastic yarns
A method has been adopted in which the amount of the oil agent attached is increased before winding, or the yarn has a special cross-sectional shape.

However, there is a problem that it is costly to obtain a special yarn cross-sectional shape and the obtained yarn is limited. If a large amount of oil is applied, the periphery of the machine stand becomes dirty. However, there is a problem that the operability is deteriorated such that the wound cheese also becomes dirty.

Japanese Patent Laid-Open Publication No. Hei 6-316373 discloses that the outermost layer has a total winding width of 70 to 70 mm in order to reduce the shedding during unwinding.
A winding method for providing a wound portion with a winding width of 95% is described. According to this method, it is possible to reduce yarn breakage and tearing at the time of unwinding, but this is not sufficient, and when unwinding cheese wound by this method, uneven tension occurs on the yarn. However, processed yarns, such as covering yarns, and woven or knitted materials, such as tricots, using these yarns have the disadvantage of inferior quality.

[0005] In other words, the elastic yarn is unwound while being stretched about twice during post-processing to obtain a processed yarn or a woven or knitted fabric. The yarn at the end face is pulled out to the center, and unevenness in tension occurs in the yarn, and yarn breakage is likely to occur due to friction between the yarns. Further, the ear height portion is crushed by the tension of the yarn, the wound shape is deformed, and the yarn breakage and the shedding are likely to occur.

In order to solve the above-mentioned problem, the inventors of the present invention disclosed in Japanese Patent Application Laid-Open No. Hei 9-286566 a method in which the width of the innermost layer is made smaller than the width of the surface layer so that ear height is reduced. Then, a winding method that can reduce the traversing and yarn breakage during unwinding was proposed.

According to this method, it is possible to prevent the surface layer from falling off during unwinding and to reduce yarn breakage during unwinding during post-processing. However, the innermost layer (20 turns)
g or less), yarn breakage is liable to occur, and it has been found that this tendency becomes remarkable when the unwinding speed from the cheese is as high as about 100 m / min.

[Problems to be solved by the invention]

[0008] The present invention solves the above problems,
It can be wound up well, and even when unwinding and unwinding speed for post-processing are high, there is no trouble such as variation in tension from the surface layer to the very innermost layer, twill drop, thread breakage, etc. Another object of the present invention is to provide a method of winding an elastic yarn.

[Means for Solving the Problems]

[0009] The present inventors have eagerly solved the above-mentioned problem.
As a result of repeated studies, the present inventors have reached the present invention. That is, the book
The invention relates to a method for winding a spun elastic yarn into a cheese shape.
And a certain time T from the start of winding₁Average twill angle A₁Below
The range is defined by the formula ₀At full winding time T₀Winding up
Abstract is a method for winding elastic yarns, characterized by
Things. 0.7A₀≤A₁≤0.95A₀ 0.02T₀≤T₁≤0.10T₀

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail. First, in the present invention, a spun elastic yarn is wound into a paper tube or the like in a cheese shape, and examples of the elastic yarn include polyurethane and polyetherester.

[0011] These elastic yarns may be obtained by any of wet spinning, dry spinning and melt spinning. Further, the winding speed is not particularly limited,
According to the present invention, compared to the case of low-speed spinning, the relaxation of the contraction force of the yarn is difficult to progress, the winding tension is high, the tightening after winding is large, and the winding is performed at a high speed of 300 m / min or more. It is also effective in the case of high-speed spinning.

Next, the winding method of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the shape of cheese wound by the winding method of the present invention, and FIG. 2 is a schematic diagram showing the shape of cheese wound by a conventional method having a constant twill angle.

The method of the present invention, when taking firewood to Manmeku time T ₀ by setting the winding angle A _0, the average winding angle A ₁ within a certain time period T ₁ from the time of coiling the start what the range of the following formula It is. 0.7A ₀ ≦ A ₁ ≦ 0.95A ₀ 0.02T ₀ ≦ T ₁ ≦ 0.10T ₀

The set helix angle A ₀ generally means that if the helix angle is rolled at a constant value, a demon occurs and the rolled shape becomes poor.
An average twill angle that is periodically changed. The winding width for cheese is determined by the set twill angle.

After the elastic yarn is wound up, shrinkage occurs due to shrinkage, and the tendency becomes more severe toward the inner layer of the cheese. For this reason, when winding is performed on the winding bobbin d by a conventional method, as shown in FIG. 2, the outer part slightly wound more than the innermost layer swells due to tightening (part a), and the winding width increases. Occurs. For this reason, when the yarn is released due to the increase in the number of shedding in this area, unevenness in unwinding tension is generated in this area, and furthermore, the yarn breaks due to biting into the inside of the yarn.

According to the method proposed by the present inventors in Japanese Patent Application Laid-Open No. 9-286566, in which the winding width is reduced in the innermost layer for a certain period of time, the bulge slightly outside the innermost layer (portion a)
Has decreased, and the fall in the inner layer has decreased,
In the zone of 20 g or less, the yarn may cut into the inner layer from the place where the yarn was originally wound, so that the yarn may break at the time of unwinding.

[0017] Therefore, in the present invention, Maki only a predetermined time T ₁ of the first, by taking plated at 0.7 to 0.95 times the winding angle A ₁ of the set winding angle A _0, cheese Maki figure as shown in FIG. 1 Obtainable. That is, according to the coiling method of the present invention, by reducing the winding angle to take Maki between Maki a predetermined time T ₁ of the first, to increase the Mekuhaba H _1, to form a b portion is the innermost layer.

Thereafter, by winding up as the set helix angle A ₀ , winding up is performed at a width H ₀ smaller than the portion b to form a portion c. By winding up in such a shape,
Even if the part slightly outside the innermost layer swells, the swelling becomes small, no twill drop occurs, and even in the zone of 20 g or less of the inner layer, the yarn is originally prevented from digging into the inner layer from where it is wound, and unwinding Thread breakage at the time can be prevented.

[0019] winding angle A ₁ is greater than 0.95 times the set winding angle A _0, too small a difference between the set winding angle A _0, almost no difference between Mekuhaba H ₀ and H _1, as described above No effect can be achieved.

[0020] On the other hand, it is less than 0.7 times, and Mekuhaba H ₁ is too large, or protrude from the bobbin wound in the innermost layer,
The difference between the winding widths H ₀ and H ₁ becomes too large, and the effect of reducing the swelling as described above is poor, and a portion with a large swelling is generated at the portion wound at the set helix angle A ₀ .

[0021] Next a specific time T ₁ sow in winding angle A ₁ is a fully wound time when the T _0, it is necessary to 0.02T ₀ ~0.1T _0. When the time sow in winding angle A ₁ is less than 0.02 T _0, b moiety formed is too small, stitching prevented as described above, bite-preventing effect becomes poor.

On the other hand, when T ₁ exceeds 0.1T ₀ , the b portion having a large winding width becomes too large, and the winding shape shown in FIG. 2 is obtained in the b portion.

According to the present invention, the winding width is changed by changing the twill angle during winding. As a method for changing the winding width, as described in JP-A-6-316373, cheese is used. Although there is a method of adjusting the distance of the traverse guide, according to the study of the present inventors, the method of the present invention in which the traverse angle is changed during winding and the traversing speed is changed is most effective also from the viewpoint of workability. It is.

In order to further improve the appearance of the cheese-shaped package obtained by the present invention (eliminate the ear-height portion), the cheese-wound package is kept at 100 ° C. or higher, and more preferably at 110 ° C. or more.
The heat treatment is preferably performed at a temperature of 130 ° C. for 0.5 hours or more, and more preferably for 1.0 to 3.0 hours.

[0025]

Next, the present invention will be described in detail with reference to examples. The unwinding property was determined by unwinding the cheese-like package obtained in each example using the unwinding device shown in FIG. At this time,
While stretching between the supply roller 7 and the stretching roller 8 twice,
The film was wound by a winder 9. The speed of the supply roller 7 is 10
0 m / min. In each case, unwinding was performed for 12 hours using 12 packages #, and the number of yarn breaks at this time was indicated by the number of times per hour.

Examples 1 to 5 and Comparative Examples 1 to 5 A transesterification reaction of dimethyl terephthalate and 1,4-butanediol was carried out, followed by addition of polytetramethylene glycol and an antioxidant to carry out a polycondensation reaction. Viscosity (using an equal weight mixed solvent of phenol and ethane tetrachloride,
Measured at 20 ° C. ) Was 2.25, and a polymer having a melting point of 180 ° C was obtained. After drying this polymer under reduced pressure, spinning and winding were performed using the melt spinning machine shown in FIG. At this time, the winding speed 60
The film was wound up at a constant angle of 0 m / min under the conditions of the twill angle shown in Table 1. The spinneret 1 has a discharge hole having a diameter of 0.4 mm, a round cross section, and a diameter of 12 mm.
After cooling the spun yarn with the cooling cylinder 2, a silicone oil is applied by the oil applying device 3, and the spun yarn is applied through the first godet roller 4 and the second godet roller 5.
It was wound up on a 57 mm wide paper tube with a Coff Winder 6. In addition,
The single hole discharge amount was 3.33 g / min, and the winding amount was 400 g winding (120 minute winding). Further, the wound yarn was heat-treated at 110 ° C. for 90 minutes while keeping the cheese. Table 2 shows the evaluation results of the unwinding property of the obtained package.

[0027]

【table 1】

[0028]

[Table 2]

As is evident from Table 2, the elastic yarns wound in Examples 1 to 5 have a small number of yarn breaks during unwinding, and particularly when the extremely innermost layer is unwound (yarn cut 12). There were few cuts. On the other hand, since Comparative Examples 1 and 2 were wound with the set twill angle constant, the winding appearance of the package was as shown in FIG. 2, and the yarn breakage was particularly large in the inner layer during unwinding. In Comparative Example 3, since the twill angle A1 was less than 0.7A0, many yarn breaks occurred before reaching the innermost layer during unwinding. In Comparative Example 4, since the twill angle A1 was larger than A0, many yarn breaks occurred in the innermost layer during unwinding. For Comparative Example 5 T ₁ is too large, there is little effect of adjusting the winding angle, cause bulges Maki took part in T ₁ times, the solution舒時, yarn breakage occurred frequently before reaching the innermost layer. In Comparative Example 6, since T1 was too small, the effect of preventing the package from swelling and traversing was insufficient, and the yarn was broken in the extremely innermost layer during unwinding.

[0030]

According to the winding method of the present invention, by increasing the winding width at the beginning of winding to an appropriate width for a specific time, swelling slightly outside the innermost layer is eliminated, and It can be wound up while preventing bite of the yarn. Thereby, at the time of post-processing, it is possible to unwind the yarn of the extremely innermost layer without trouble such as yarn breakage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the shape of a cheese-like package wound by the method of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the shape of a conventional cheese-like package wound up at a constant set helix angle.

FIG. 3 is a schematic process diagram showing one embodiment of a melt spinning process to which the winding method of the present invention is applied.

FIG. 4 is a schematic process diagram showing one embodiment of a process of unwinding a cheese-like package.

[Explanation of symbols]

 a bulging part b part with large winding width c part that has been wound up with the set winding width d winding bobbin

Claims (1)

[Claims] When winding a spun elastic yarn into a cheese shape, an average twill angle A ₁ within a predetermined time T ₁ from the start of winding.
Was in the range of the following formula, hereinafter Manmeku time setting the winding angle A ₀ T ₀
A method for winding an elastic yarn, comprising winding up the elastic yarn. 0.7A ₀ ≦ A ₁ ≦ 0.95A ₀ 0.02T ₀ ≦ T ₁ ≦ 0.10T ₀