JP2000038253A - Drum-like synthetic fiber yarn package and winding method for synthetic fiber yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize thread quality, to increase a winding density and to reduce the hardness difference between the center and end face even at a high twill angle by setting the winding density of a yarn package to specific g/cm3 or above, setting the trill angle to a specific angle or above, and setting a bulge factor to specific % or below. SOLUTION: The winding density of a yarn package is set to 0.69 g/cm3 or above to prevent an increase of the occurrence rate of a layer drift and an increase of the occurrence rate of claims caused by shocks at the time of transportation. The twill angle is set to 5.5 deg. or above to prevent the bulging of a drum end face and a defective wound shape. The bulge factor is set to 8.0% or below to prevent the occurrence of an unraveling tension abnormality caused by the drift or ring slip off of a yarn. A high and satisfactory winding density is obtained, and the hardness difference between the center and end face can be reduced. A knit/woven product having a high unraveling property, little tension fluctuation and high quality 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 drum-shaped synthetic fiber yarn package (hereinafter, sometimes simply referred to as a yarn package) and a method for winding a synthetic fiber yarn.

[0002]

2. Description of the Related Art In recent years, for the purpose of improving productivity, simplifying a spinning method, and reducing equipment costs by omitting steps, the polyamide fiber spun by melt is solidified by cooling, and an oil agent is applied. Various winding techniques have been studied.

[0003] The yarn package obtained by such a high-speed winding method has a difference in winding hardness between both ends and the center of the yarn package.

[0004] In such a yarn package, damage to the yarn due to contact with the touch roller is concentrated only at both ends, which causes periodic yarn quality differences and dye adhesion differences, so-called spotting. .

[0005] When the yarn is unwound from such a yarn package, the yarn becomes uneven in tension, which causes sink marks in the knitted fabric.

As a countermeasure against this, Japanese Patent Publication No. 58-46569
As disclosed in Japanese Unexamined Patent Application Publication No. H11-163, the difference in the amount of yarn lamination between the drum end face and the center part is reduced and the hardness difference is also reduced, but the drum end face swells and the so-called bulge ratio increases, and The appearance is bad.

[0007] In such a yarn package, the unwinding property of the yarn is deteriorated, and abnormalities in unwinding tension due to misalignment of the yarn in the yarn package or dropout of the ring occur. When a secondary product is made using the yarn of the yarn package, yarn breakage due to poor unwinding frequently occurs.

[0008] Usually, the yarn package is laid so that the end face is horizontal when packing during transportation, and the both end faces are fixed so as to be sandwiched between packing materials. When packing is carried out in this way, only the parts with the most swelling are in contact with and fixed to the packing material, so that swaying during transportation and the weight of the yarn package stacked on the upper stage cause damage to some of the contact surfaces. , Which can cause weak yarn, fluff, and breakage of the knitting yarn.

On the other hand, the hardness difference can be reduced by increasing the contact pressure between the yarn package and the touch roller in contact with the outer peripheral surface thereof. However, when a conventional spindle-driven winding machine is used, Since the friction roller was used to rotate the touch roller only by friction from the contact surface with the yarn package that comes into contact with the outer peripheral surface, the driving force was transmitted to the touch roll through the contact surface, and the yarn package was touched. A slight slip occurs between the rolls, which is accompanied by heat generation.

The effect on the yarn quality is not so problematic when the contact pressure is low, but when the contact pressure is too high, the yarn is damaged, so that the difference in winding hardness between both ends and the center can be sufficiently reduced. Did not.

In knitting using a yarn package, the winding density is often a problem. That is,
This is because the larger the winding density of the yarn package, the larger the amount of winding that can be installed in the creel at the predetermined interval, and the number of times of changing drums and knotting is reduced, which contributes to labor saving and cost reduction.

[0012] Also, the winding density is often a problem when transporting a yarn package. Because, the higher the winding density, the higher the hardness of the entire yarn package,
This is because it contributes to a reduction in the incidence of complaints, such as a reduction in the occurrence of layer misalignment due to impact or the like during transportation when packed by the above method.

From these requirements, the most effective winding condition for increasing the winding density is to increase the contact pressure. However, the conventional method has a limit for the above-mentioned reason.

From the above, a yarn package satisfying all of the uniformity of yarn quality, good winding appearance, small difference in winding hardness between both ends and the central portion, and high winding density can be obtained by a conventional winding method. Then it was not obtained.

[0015]

SUMMARY OF THE INVENTION Accordingly, the present invention is to solve the above-mentioned problems of the prior art, specifically, to achieve a uniform yarn quality and a high winding density at a spinning speed of 3000 m / min or more. , Even at high twill angles, reduces the hardness difference between the center and the end face,
The difference in hardness in the yarn package is small, and it is possible to wind a drum-shaped synthetic fiber yarn package with a good winding shape, and to obtain a higher-quality knitted fabric than a conventional low contact pressure yarn package. The task is to take it.

[0016]

In order to solve the above-mentioned problems, the drum-shaped synthetic fiber yarn package of the present invention mainly has the following constitution. That is, the winding density is 0.69 g /
cm ³ or more, twill angle 5.5 ° or more, and bulge rate 8%
A drum-shaped synthetic fiber yarn package characterized by the following.

The method for winding a synthetic fiber yarn of the present invention mainly has the following configuration. That is, in winding the synthetic fiber yarn at a spinning speed of 3000 m / min or more, a touch roller driven by a motor different from a spindle is brought into contact with a drum-shaped synthetic fiber yarn package formed on a spindle shaft, The combination is characterized in that the rotation speed of the spindle is controlled so that the rotation speed of the touch roller is constant, the surface pressure is 0.3 kg / package stroke 1 cm or more, and the helix angle is 5.5 ° or more. This is a method of winding a fiber yarn.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drum-shaped synthetic fiber yarn package of the present invention has a winding density of 0.69 g / cm ³ or more, preferably 0.70 g / cm ³ or more. If the winding density is less than 0.69 g / cm ³ , the rate of occurrence of layer shift due to impact during transportation will increase, leading to an increase in the rate of claims, and the amount of winding that can be installed in the creel at a predetermined interval. And the number of drum exchanges and thread knots increases,
The amount of work increases and the cost increases.

In the present invention, the winding density refers to a value represented by the following equation.

Winding density = winding weight / volume of package yarn portion Here, the package yarn portion volume is defined as a: the surface layer winding width of the yarn package, the maximum bulging portion winding width of the inner layer, b, and the innermost layer winding width. c, the maximum winding diameter of the yarn package is f ₁ , the minimum winding diameter is f ₂ , and the outer diameter of the yarn winding pipe is r, and A = (a + b + c)
/ 3, B = (f ₁ + f ₂ ) / 2, Aπ (B ² -r ² ) / 4
Means the value obtained by

The yarn angle of the yarn package of the present invention is 5.5 ° or more, preferably 6.0 ° or more. When the twill angle is less than 5.5 °, the drum end surface swells, so-called bulge ratio increases, and the winding appearance becomes poor.

In the present invention, the twill angle is an angle formed by a yarn wound in a twill shape around the surface of the yarn package with respect to a plane perpendicular to a rotation axis at the time of winding the yarn package.

Further, the bulge ratio of the drum-shaped synthetic fiber yarn package of the present invention is 8.0% or less, preferably 7.5%.
% Or less. When the bulge ratio exceeds 8.0%, the unwinding property of the yarn is deteriorated, and the unwinding tension is abnormal due to the deviation of the yarn in the yarn package or the missing of the loop. When a secondary product is made using the yarn of the yarn package, not only the yarn breakage due to poor unwinding occurs frequently, but also the swaying during transportation and the damage due to the weight of the yarn package stacked on the top It is concentrated on the surface, causing weak yarn, fluff, and breakage of the knitting yarn.

In the present invention, the bulge ratio means the ratio (%) of the maximum bulging portion winding width b of the inner layer to the innermost layer winding width c of the yarn package, and is expressed by the following equation.

Bulge rate (%) = {(bc) / c} × 100 Further, the difference in hardness between the end face and the center of the drum-shaped synthetic fiber yarn package of the present invention is preferably 16 or less.

In the present invention, the difference in hardness between the end face and the center is defined as the difference between the hardness at five points that divides the winding width into four equal parts at each of six measuring points on the surface circumference of the yarn package. It is an average value. The hardness at each point is measured by a Hardness Tester manufactured by Shimadzu Corporation.

In the present invention, synthetic fibers include fibers represented by polyester fibers, polyamide fibers, and polyolefin fibers, and polyamide fibers include nylon 6-based fibers, nylon 66-based fibers, and nylon 6-based fibers. -10-based fiber, which is more common when the synthetic fiber is a polyester-based fiber or a polyamide-based fiber, and when the polyamide-based fiber is a nylon 6-based fiber or a nylon 66-based fiber. There are many cases where winding is performed at high spinning speed, and the effectiveness of this technology, which aims to improve the yarn package at high spinning speed, is high.

Here, the polyester fibers include polyethylene terephthalate as a fiber material polymer, copolymerized polyester containing a part of a repeating unit other than ethylene terephthalate, and polyester obtained by partially mixing a polymer other than polyethylene terephthalate with polyethylene terephthalate. One using a polymer blend is exemplified. In addition, the polyamide-based fibers include, as a fiber material polymer, a polyamide, a copolymerized polyamide containing a part of other than polyamide as a repeating unit, and a polyamide polymer blend obtained by partially mixing a polymer other than polyamide with polyamide. Can be

In the method for winding a synthetic fiber yarn of the present invention, the length is preferably 3000 m / min or more, more preferably 4000 m / min.
This is to wind a synthetic fiber yarn at a spinning speed of / min or more. Three
In the low-speed winding method of less than 000 m / min, the difference in winding hardness between both ends and the center of the obtained drum-shaped yarn package is small, and it is not necessary to solve the above-mentioned problem.

In the method for winding a synthetic fiber yarn of the present invention, a touch roller driven by a motor different from the spindle is brought into contact with the synthetic fiber yarn package formed on the spindle shaft, and The control is performed by the rotation speed of the spindle so that the rotation speed is constant. Specifically, the rotation speed of the touch roller is detected, and the rotation speed of the touch roller is controlled by increasing or decreasing the speed by the spindle rotating in contact with the touch roller so that the rotation speed becomes a set value. Things.

If the spindle and the touch roller are not driven and controlled by the above method, a driving force is transmitted to the touch roll through the contact surface, and a slight slip occurs between the yarn package and the touch roll, thereby generating heat.
When the contact pressure is low, there is not much problem. However, when the contact pressure is too high, the yarn is damaged, so that the difference in winding hardness between both ends and the center cannot be sufficiently reduced.

In the method for winding a synthetic fiber yarn of the present invention, the surface of 0.3 kg / package stroke 1 cm or more, preferably 0.32 kg / package stroke 1 cm or more, more preferably 0.34 kg / package stroke 1 cm or more. Pressure. Surface pressure is 0.3
If the package stroke is less than 1 kg / package stroke, the winding density decreases, leading to an increase in the rate of occurrence of layer displacement complaints due to impact during transportation and the like. This increases the amount of work and the cost, for example, by increasing the number of times of changing and knotting.

In the present invention, the surface pressure is the pressure applied between the outer peripheral surface of the yarn package being wound and the touch roller, in other words, the weight applied per 1 cm of the yarn package stroke (kg / package stroke 1 cm). And is represented by the following equation.

Surface pressure (kg / package stroke 1cm)
= W / (n · l) where W is the load applied between the outer peripheral surface of the yarn package and the touch roller per winding machine, l is the package stroke in the traverse direction per drum, and n is the winding machine 1. It is the number of yarns per platform.

In the method for winding a synthetic fiber yarn of the present invention, the twill angle is 5.5 ° or more, preferably 6.0 ° or more. If the helix angle is less than 5.5 °, the end face of the drum swells, the so-called bulge ratio increases, and the winding appearance becomes poor.

[0036]

Next, the present invention will be described in detail with reference to examples.

[Examples 1 to 4, Comparative Examples 1 to 5] Nylon 6 fiber, 15 denier-3 filament, 15 denier
5 filaments and 12 denier-3 filaments were directly spun and drawn and wound up at a speed of 4000 m / min (Examples 1 to 4). At this time, the surface speed of the touch roll is 400 in a state of not touching the yarn package.
The rotation speed of the motor of the roll was set so as to be 0 m / min, and the rotation speed of the spindle was controlled so that the surface speed of the touch roll was 4000 m / min in a state of contact with the yarn package. The surface pressure was 0.30 kg / package stroke 1 cm in Examples 1 and 2 and Example 4, and 0.36 kg / package stroke 1 cm in Example 3. The results are shown in Table 1.

[0038]

[Table 1] For comparison, the results obtained by winding the conventional method in which the touch roll is not driven and the winding angle conditions outside the scope of the present invention are also added. As can be seen from this table, in the example, the bulge ratio is 8% or less, which is good. On the other hand, in a comparative example outside the scope of the present invention, if at least one of the helix angle and the presence or absence of rotation of the touch roller deviates, the bulge ratio becomes larger than 8% (Comparative Examples 1, 2, and 3), and the secondary product is manufactured. At the time of manufacturing, the quality is degraded or the yarn breaks frequently due to the unwinding tension abnormality due to the deviation of the yarn in the yarn package or the missing of the loop. Further, according to the method of the present invention, the winding density is high, and (6.9 kg / cm ²
As described above, a yarn package having a low hardness difference (less than 16) between the end face and the center can be obtained. Conversely, even when the touch roll is driven and the twill angle is within the range of the present invention, if the surface pressure is low, problems such as low winding density and high hardness difference occur, and periodic yarn quality differences, dye spots, and tension spots occur. This may not only degrade the quality of the knitted fabric but also cause a defect. (Comparative Examples 4 and 5) In addition, 48 drums each wound in Example 4 and Comparative Example 4 were packed by the above-described packing method, and each of the drums was packed in an Aichi-
The following table shows the rate of occurrence of layer misalignment after round-trip transportation between Kyushu by truck.

[0039]

[Table 2] As can be seen from Table 2, in Comparative Example 4 (the drum winding density was 0.68 g / cm ³ ), a layer shift occurred in the 6.3% drum. 0.
By controlling the amount to 70 g / cm ³ ), the occurrence of the layer shift could be completely suppressed.

[0040]

The yarn package of the present invention has a high winding density, which has never been obtained with synthetic fibers, a good winding density, and a small difference in hardness between the center and the end face. Accordingly, the unwinding property of the yarn package is good, the fluctuation in tension is small, the yarn breakage during knitting is reduced, and a high-quality knitted fabric can be obtained. In addition, the winding amount can be increased with respect to the yarn package diameter, and the working efficiency in high-order processing can be increased.
Furthermore, because the whole yarn package is formed firmly,
Problems such as layer shift during transportation are also significantly reduced. As a winding method for obtaining the above yarn package, by also driving the touch roll, it is possible to prevent slippage between the yarn package and the touch roll, whereby the condition of high contact pressure without damaging the yarn can be obtained. It became possible for the first time.

By winding by the above-mentioned means, it is possible to obtain a yarn package having a high winding density, a small difference in hardness and a good winding appearance with little end face collapse. Furthermore, by using the above-mentioned yarn package, a high-quality knitted fabric without sink marks can be obtained.

Claims (7)

[Claims] 1. A drum-shaped synthetic fiber yarn package having a winding density of 0.69 g / cm ³ or more, a twill angle of 5.5 ° or more, and a bulge ratio of 8% or less. 2. The drum-shaped synthetic fiber yarn package according to claim 1, wherein the hardness difference between the end face and the center is 16 or less. 3. The drum-shaped synthetic fiber yarn package according to claim 1, wherein the winding density is 0.70 g / cm ³ or more. 4. The drum-shaped synthetic fiber yarn package according to claim 1, wherein the twill angle is 6.0 ° or more. 5. The bulge ratio is 7.5% or more.
5. The drum-shaped synthetic fiber yarn package according to any one of 4. 6. In winding a synthetic fiber yarn at a spinning speed of 3000 m / min or more, a touch roller driven by a motor different from a spindle is mounted on a drum-shaped synthetic fiber yarn package formed on a spindle shaft. Contact, and control by the rotation speed of the spindle so that the rotation speed of the touch roller is constant, 0.3 kg / package stroke 1 cm
A method for winding a synthetic fiber yarn, characterized in that the surface pressure is set as described above and the twill angle is set to 5.5 ° or more. 7. The method for winding a synthetic fiber yarn according to claim 6, wherein the twill angle is 6.0 ° or more.