JPS6022085B2 - Melt spinning method for nylon-6 fibers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process for producing nylon-6 fibers into fused paper yarn, particularly a high-speed yarn spinning process.

As a melt-spinning method for polyamide fibers, a method is divided into a paper yarn process to produce a drawn yarn and a drawing process to produce useful fibers by stretching the drawn yarn (conventional method).
However, the development of high-speed spinning methods for the purpose of directly connecting the Ikekata spinning process and the drawing process to improve productivity is being actively pursued and implemented.

However, yarns obtained by high-speed spinning methods have a looser internal structure than yarns obtained by conventional methods, and while they have better uniformity during dyeing, they have poor wet waxing properties when washed, etc. have. This is a fatal drawback especially for polyamide fibers, which are widely supplied for sports applications. Various studies have been made to overcome this drawback.

Examples include: ■ A method for spinning yarn by blending tannic acid (Japanese Unexamined Patent Publication No. 5-6672), ■ A method for spinning yarn by blending a polyvalent amine (Tsubaki Seki Sho 52-124927), ■ Amine/terminal group amount A method of spinning silk by regulating the
No. 3717) and other proposals have been made. However, the aim of the high-speed silk reeling method is to reduce manufacturing costs by streamlining processes by omitting processes, and if thread breakage occurs frequently during dyeing, the yield will drop and the number of personnel will increase, reducing the effectiveness of streamlining. That is, in order to avoid adverse effects on yarn-spinning properties, it is necessary to improve dyeing fastness without blending different substances or using raw materials different from conventional ones. 0 On the other hand, the fibers are applied with an oil agent required in the spinning process and during yarn spinning that is required in a higher-order process, and if this oil agent is applied unevenly, it is likely to cause problems in yarn-spinning performance and higher-order processing.

In the conventional method, where the fiber running speed is slow, it is relatively easy to uniformly apply an oil agent, but in the case of a high-speed spinning method, the fiber traveling speed is far, which makes it difficult to uniformly apply an oil agent. There is a problem in that the oil applied to the fibers is blown off and scattered into the atmosphere because it is traveling at high speed. The present invention was devised in view of the various drawbacks of the prior art, and its purpose is to make it possible to apply an oil agent uniformly to fibers running at high speed and to prevent it from scattering into the atmosphere as much as possible, and to dye the resulting yarn. The object of the present invention is to provide a melt spinning method that improves fastness.

The object of the present invention is to cool and solidify melt-spun nylon-6 fibers so that the moisture content is 1.5 to 3. Oiling is applied to the yarn so that it becomes X%, and then the first Godet roller and the second
After giving a stretch of 20-60% between Godet rollers, 3
A method for melt spinning* of nylon-6 fibers, characterized by winding up at a speed of 500 mm/min or more.

'21 After cooling and solidifying the molten nylon 16 fibers, the moisture content was 1.5 to 3. After applying the first stage oiling so that the fiber density is 9%, and then elongating the yarn by 20 to 60% between the first Godet roller and the second Godet roller, an air supply device installed directly below the second Godet roller is applied. A method for melting paper yarn of nylon-6 fibers, characterized in that the oil applied in the first stage is migrated, then the oil for processed yarn is applied, and the yarn is wound at a speed of 3500 m/min or more.

However, the expansion mentioned here is expressed by the following formula.

Damage (distant distance between the 2nd Godet roller) - (same speed of the 1st Godet roller) xl.

〇Achieved by the peripheral speed of the first Godet roller.

In the present invention, before the fused paper yarn is sufficiently cooled from the spinneret and taken up by the first Godet roller, the first stage oil supply device lowers the moisture content to 1.5 to 3. skin t%
It is necessary to apply oiling so that

If the moisture content deposited in the first stage exceeds 3.0%, the orientation of the amorphous portion will decrease, and the dye fastness of the resulting yarn will be significantly inferior. At the same time, since the yarn is running at high speed, oil is scattered in the atmosphere, which is not environmentally preferable for production equipment. On the other hand, if the moisture content is less than 1.5%, there is no problem with dyeing fastness, but the thread tends to slip on the first Godet roller and the second Godet roller, increasing yarn unevenness and making it difficult to obtain stable spinning performance. becomes difficult. In order to fully satisfy each of the above-mentioned dyeing fastness, yarn unevenness, and yarn spinnability, the moisture content should be 2.0% to 3.0%.
% range is particularly preferred. The yarn oiled to satisfy a predetermined moisture content is then stretched by 20 to 60% between the first Godet roller and the second Godet roller, and then wound at a speed of 3500 rpm or more. As a result, a yarn with improved dye fastness and less yarn unevenness can be obtained with good spinning properties. In this case, if the elongation between the first Godet roller and the second Godet roller is less than 20%, the residual elongation will be large, the grain orientation will be low, and the dye fastness will be reduced.

Further, if this elongation exceeds 60%, the speed of the first Godet roller decreases and the orientation of the yarn becomes loose. Since water is added in this loose state, spherulites are generated near the surface layer of the yarn, and at the same time, many voids are also generated. This increases the number of voids due to the average staining hardness. This is undesirable because it lowers the degree of corrosion. The yarn obtained in the above condition has a small amount of oil attached, and since it is running at high speed, the oil adheres unevenly, so it is difficult to say that it is a raw yarn suitable for high-order processing as it is.

In the present invention, in order to obtain a yarn excellent for high-order processing, the first Godet roller and the second Godet roller are required.

- The second yarn is given a predetermined elongation between the
An air crossing device installed directly below the godet roller sprays air perpendicular to the yarn to migrate the oil applied in the first stage, and then the yarn that has passed through the air entangling device is processed in a higher processing step. It is necessary to add the necessary oil to the appropriate amount of oil and moisture and roll it up. The air pressure required for migration is l.
k9/pillow G to 6k9/〆G is sufficient.

Next, the effects of the present invention will be explained in detail using Examples. Examples 1 to 3, Comparative Examples 1 to 4 Nylon-6 chips (relative viscosity 2.6) were melt-spun,
After being discharged and cooled so that the weave after winding is 70 denier and 24 filaments, the first stage oil supply device is also used.
The amount of moisture attached is 1.0%, 1.5%, 2.0%, respectively.
Lubricating the oil to 3.0%, 4.0%, 5.0%, and 6.0%, then the second Godet roller elongates 40% between the first Godet roller and the second Godet roller at 4500 skins/min. The dyeing fastness, yarn unevenness, scattering of oil agent into the atmosphere, and yarn spinnability of the yarn that was fed and wound were evaluated.

The results are shown in Table-1. Table 1 As is clear from Table 1, Examples 1 to 3 that satisfy the present invention are superior to Comparative Examples 1 to 4 in spinning properties, Worcester unevenness, and dye fastness, and there is no oil scattering. Met.

Examples 4 to 7, Comparative Examples 5 to 8 Nylon-6 chips (relative viscosity 2.6) were melt-spun,
After being discharged and cooled so that the weave after winding is 70 denier and 24 filaments, the first stage oil supply device supplies oil so that the moisture adhesion amount is 2.5%, and then the first Godet roller and the second 0% and 10 respectively between Gode Rofu ×
%, 20%, 30%, 40%, 60%, 80%, and 100% elongation and then winding at 4500/min, the residual elongation, birefringence, and color fastness were evaluated. .

The results are shown in Table-2. As is clear from Table 2, it can be seen that in the case of Comparative Examples 5 to 8, which deviate from the elongation conditions specified in the present invention, the color fastness is significantly reduced. Furthermore, this result cannot be explained by elongation and birefringence alone, but indicates that the orientation at the time of adding moisture has an effect on color fastness. Table 2 Examples 8 to 1 Comparative Examples 9 to 12 Nylon-6 chips (relative viscosity 2.6) were melt-spun,
After being discharged and cooled so that the weave after winding is 70 denier and 24 filaments, oil is supplied in the first stage oiling device so that the amount of moisture attached is 1%, 2.5%, and 4.5%. , then 40 between the first Godet roller and the second Godet roller
% elongation and 4500 skin/
The air pressure was changed to ok9/no G, lk9/lump G, and 3k9/flow G using the air entangling device installed directly below this, and then the total water content was adjusted to 4.
5% and the oil content was 1.0%, and the yarn was wound up and evaluated for dyeing waxiness and unevenness of oil adhesion in the longitudinal direction of the yarn.

The results are shown in Table-3. As the moisture content increases and the air pressure increases, the unevenness of oil adhesion in the yarn warp direction decreases.

However, the color fastness is reduced. It can be seen that there are appropriate conditions that satisfy both dyeing hardness and uneven adhesion in the yarn warp direction. Table 3 In Examples and Comparative Examples, dye fastness and oil adhesion unevenness were measured and evaluated using the following methods.

Regarding the color fastness, a cylindrical striped fabric was prepared and dyed under the following conditions.

XyleneFastBlueP125%
After dyeing using 2% owf complex acid 1% and 3% amylazine D at 98° C. and a bath ratio of 1:100, the following fixing treatment was performed.

Using nylon fixes TH 5% o Wf formic acid 1%〃, 30 pm at 80 pm
Minutes.

After that, soak in 40qC warm water containing Zapu 52/So for 45 minutes (
After washing for 1:100 minutes, the washing liquid was judged with the naked eye: 5th grade: no dye color at all 4th grade: very slight trace of color: 3rd grade: slight color: 2nd grade Class: 1st grade for slightly colored items and 5 levels for very colored items.

Regarding uneven oil adhesion, add commercially available red ink to the paper yarn oil agent to a concentration of 10%, then wind up the yarn to make a tube knit, and judge the unevenness with the naked eye. Items were evaluated separately into three categories: large items and small items.

Claims (1)

[Claims] 1. After cooling and solidifying the melt-spun nylon-6 fibers, oiling is applied so that the moisture content becomes 1.5 to 3.0 wt%, and then the yarn is passed through a first Godet roller and a first Godet roller. After giving a stretch of 20-60% between two Godet rollers, 35
1. A method for melt spinning nylon-6 fibers, which comprises winding up at a speed of 00 m/min or more. 2. After cooling and solidifying the melt-spun nylon-6 fibers, the first stage oiling is applied so that the moisture content becomes 1.5 to 3.0 wt%, and then the yarn is passed through a first Godet roller and a second Godet roller. After giving an elongation of 20 to 60% in between, the oil agent applied in the first stage is migrated by an air entangling device installed directly under the second Godet roller.
A method for melt-spinning nylon-6 fibers, which comprises subsequently applying a processed yarn oil and winding the fibers at a speed of 3,500 m/min or more.