JPH11217726A - Winding of polyamide fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain in good operability a package in pirn form with favorable figure, less apt to develop flaws (bright specks) even if used for woven fabric wefts, by drawing undrawn polyamide yarn so as to set the shrinkage of the resulting yarn when left unrestricted within a specified range followed by winding the yarn under specified conditions. SOLUTION: The subject winding method comprises the following process: an undrawn polyamide (e.g. nylon-6) yarn in the form of monofilament is hot drawn at 100-150 deg.C so as to set the shrinkage of the resulting yarn at 3.0-5.0% when left unrestricted, and the yarn is subsequently wound to a package in pirn form at a rate of 25-50 m/half traverse. It is preferable that, following drawing the undrawn polyamide yarn, the resulting drawn yarn is put to heat treatment at 130-180 deg.C under a relaxed condition at 1.1-5.0%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of winding a polyamide fiber used for weft yarn of a woven fabric into a package in a pirn winding form.

[0002]

2. Description of the Related Art When a polyamide undrawn yarn is drawn and wound, it is usually wound into a cheese wound package and a pan wound package, and the yarn wound in these packages is shrunk. Depending on the value of the rate and aging, a difference in physical properties easily occurs between the yarns (the inner layer and the outer layer of the package).

[0003] In particular, the difference in physical properties as described above occurs in the yarn wound near the end face of each package (called a tapered portion in the case of a package of a wrapped type) (about 1 cm in width). Easy to occur. When weaving is performed using a package having a difference in physical properties between yarns as a weft, a defect (pulling) occurs in a woven fabric.

[0004] In the case of a package in the form of a pirn winding,
Wound from the upper end to the lower end or from the lower end to the upper end of the pan, since the winding length is long (usually, the winding length is 10
0-500 m / half traverse), if there is a difference in physical properties between the yarn wound around the tapered portion and the yarn wound around other portions, defects occur at regular intervals every 100-500 m of the wound yarn length. Occurs. That is, a normal part of about 90-450m and about 10-
A yarn having a defect of 50 m alternately exists.

When this is made into a woven fabric, the woven width is usually 1.8 m.
Therefore, the number of yarns of the defective portion of about 10 to 50 m becomes 5 to 28 continuous weft yarns, and the defective portion exists in the whole woven fabric as a unit, resulting in a very noticeable woven defect.

On the other hand, in the case of a cheese wound package, the winding length is short (usually, the winding length is
1.0 to 2.5 m / half traverse), if there is a difference in physical properties between the yarn wound around the cheese end face and the yarn wound around the other part, defects occur at regular intervals every 1.0 to 2.5 m of the wound yarn length Occurs. That is, the yarn has a normal part of about 0.7 to 2.0 m and a defective part of about 0.3 to 0.5 m alternately.

When this is made into a woven fabric, the woven width is usually 1.8 m
Therefore, a plurality of defective portions are generated in one weft, but this is different from the case of the above-mentioned pat, and the woven defects are dispersed throughout the woven fabric and are not so noticeable.

As described above, the drawback of the woven fabric is that the wrapped package is more noticeable when the wrap wound package is used for the weft. Therefore, the cheese wound package is more often used for the woven weft. I have.

However, depending on the type of yarn (for example, a monofilament of drawn yarn), even if it is wound in a pirn winding form, it is not wound in a good package in a cheese winding form, so However, there is a demand for a package in the form of a pirn winding, which is less likely to cause a periodic defect even if it is used. However, there has not yet been proposed a method of obtaining a package in the form of a pirn winding which sufficiently satisfies such a demand.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and has a drawback even when used for wefts of textiles.
It is an object of the present invention to provide a method for winding a polyamide fiber, which can obtain a package in a wrapped-pan shape in which the occurrence of a wrap is difficult.

[0011]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to a method in which a polyamide undrawn yarn is drawn, and a yarn having a shrinkage ratio of 3.0 to 5.0% is wound into a pirn-shaped package with a winding length of 25 to 50 m / half traverse. The gist of the invention is a method for winding a polyamide fiber.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. In the winding method of the present invention, a yarn obtained by stretching a polyamide undrawn yarn to have a specific shrinkage ratio is wound into a pirn-shaped package with a winding yarn length shorter than usual.

By drawing the undrawn yarn into a polyamide fiber having a specific shrinkage ratio and winding it up, the yarn wound up at a position near the taper portion of the pirn where the difference in physical properties is liable to occur is also reduced. Can be reduced. Furthermore, by shortening the length of the winding yarn and winding it into a package in a pirn winding form, even if there is a difference in physical properties due to aging, as in the case of using a cheese winding form as a weft, it is applied to a woven fabric. The resulting defects can be made inconspicuous.

Therefore, in the present invention, after the polyamide undrawn yarn is drawn, the yarn shrinkage before winding is 3.0%.
Must be ~ 5.0%. If the shrinkage ratio exceeds 5.0%, the difference in physical properties generated in the yarn wound on the package becomes large, and when used for the weft of a woven fabric, the defect becomes very noticeable. On the other hand, if the shrinkage ratio is less than 3.0%, the tension of the yarn before winding becomes too low, so that yarn breakage or the like occurs, and the operability is significantly reduced.

Further, as described above, the shrinkage rate is 3.0 to 5.0%
The obtained yarn is wound into a package in a pirn winding form at a winding yarn length of 25 to 50 m / half traverse. In order to adjust the winding yarn length, it is preferable to change the drawing speed or the ring rail speed.

If the length of the wound yarn exceeds 50 m / half traverse, by adjusting the shrinkage ratio as described above, even if the difference in the physical properties of the yarn is reduced, if the difference in the physical properties occurs due to aging, the woven fabric In this case, a plurality of weft yarns become defective portions continuously, and the woven defects become very noticeable. On the other hand, if the winding yarn length is less than 25m / half traverse,
In particular, when the length of the winding yarn is adjusted by changing the ring rail speed, a trouble occurs in the winding machine or the winding shape cannot be improved.

In the present invention, the stretching applied to the undrawn polyamide yarn is not particularly limited, but is preferably performed between rollers, and the stretching ratio is preferably about 2.0 to 5.0 times. Then, the drawn yarn is wound up into a pirn-shaped pirn via a guide and a traveler.

Further, in the present invention, the drawing is preferably carried out by hot drawing at 100 to 150 ° C. in order to set the degree of shrinkage of the drawn polyamide yarn before winding up to 3.0 to 5.0%. Thereby, stretching can be performed stably without causing unevenness in stretching, and unevenness in physical properties can be further reduced. If the stretching temperature is less than 100 ° C., this effect is small, and the stretch ratio of the drawn polyamide yarn before winding is 5.0%.
%, And if the temperature exceeds 150 ° C., the temperature becomes too high, and troubles such as yarn breakage may occur. The thermal stretching may be performed by using a roller as a heat roller or by providing a heat treatment heater between the rollers.

Further, in order to make the stretch-shrinkage rate of the drawn polyamide yarn before winding up to 3.0 to 5.0%, after stretching the undrawn polyamide yarn, it is subjected to a heat relaxation treatment at 130 to 180 ° C. at a relaxation rate of 1.1 to 5.0%. Is preferably applied. Thereby, the physical property unevenness of the yarn can be further reduced. If the relaxation rate of the heat relaxation treatment is less than 1.1 or less than 130 ° C., the shrinkage rate tends to be larger than 5.0%. If the relaxation rate exceeds 5.0% or exceeds 180 ° C., the tension becomes too low, and thread breakage or the like occurs, and the operability tends to decrease. At this time, the relaxation treatment is preferably performed between the rollers. To perform the thermal relaxation treatment, a heat treatment roller may be provided, or a heat treatment heater may be provided between the rollers.

Next, the present invention will be described with reference to the drawings.
FIG. 1 is a schematic process diagram showing one embodiment of the present invention,
The undrawn yarn is subjected to heat drawing and heat relaxation treatment. The yarn A (undrawn yarn) is first supplied from the first roller 1, and is thermally drawn between the first roller 1 and the second roller 2 on the first heat treatment heater 4. In this case, a stretching pin (not shown) may be used if necessary. The thermally stretched yarn A is subjected to a thermal relaxation treatment between the second roller 3 and the third roller 3 by the second heat treatment heater 5. And the shrinkage rate is 3.0 to 5.
The yarn A that has become 0% passes through the picktel guide 6 and the traveler 7 and is wound into a package 9 in a pirn winding form.

The shrinkage rate in the present invention refers to the shrinkage rate of the yarn caused by a change in the internal structure of the fiber or a change in the form of the yarn when the fiber is free at normal temperature. In the third and subsequent winding zones, the yarn is supplied from the third roller 3 and wound up by a winding roller (not shown) so that the roller speeds of the third roller 3 and the winding roller are equalized, Thereafter, the speed of the winding roller is gradually reduced, and the time point at which the tension between the third roller 3 and the winding roller becomes 0 g (the time point at which the yarn becomes slack).
And is calculated by the following equation. Shrinkage ratio (%) = [(speed of third roller 3−speed of winding roller) / speed of third roller 3] × 100

The unstretched polyamide yarn of the present invention may be a yarn which has been once wound after spinning or may be continuously supplied from the spinning yarn, and has a birefringence of 15 × 10 ^{-3 to} 45.
It means about × 10 ^-3 .

As the undrawn polyamide yarn, fibers made of nylon 6, nylon 66, nylon 12, nylon 46, etc. alone or a copolymer thereof, or a polyamide composite yarn can be used. May contain a matting agent, a modifying agent and the like as long as the effect of the above is not impaired. The cross-sectional shape of these fibers is
Any of a round shape, a flat shape, an irregular shape, and a hollow shape may be used.

Further, the polyamide fiber to be wound in the present invention may be a multifilament or a monofilament. In particular, it is difficult to wind a monofilament into a good package in a cheese winding form. According to the present invention, it can be wound into a good pirn winding form, and can be used as a weft,
Are suitable.

[0025]

Next, the present invention will be described in detail with reference to examples. In addition, each physical property value in an example is measured as follows,
An evaluation was performed. (1) Shrinkage rate Measured by the method described above. (2) Operability From the spinning to winding, the number of yarn breaks during a 24-hour operation was expressed in the following four stages. 0 times ◎ 1 time ○ 2 to 5 times △ 6 times or more × (3) Grade of woven fabric The obtained filament is used for warp and weft, and woven at a density of 110 yarns / 2.54 cm and a weft density of 105 yarns / 2.54 cm. After dyeing, the obtained fabric was evaluated as follows. Ten panelists each visually evaluated the degree of defects caused by towing on a 10-point scale (10 without defects), and expressed the following 4 points from the total score. 100-85 points ◎ 84-70 points ○ 69-40 points △ 39-0 points ×

Examples 1-3, Comparative Examples 1-2 Relative viscosity (concentration 1 g / dl using 96% sulfuric acid as solvent, temperature
Measured at 25 ° C. 2. Using a 2.51 nylon 6 chip, spinning was performed at a spinning temperature of 260 ° C. and a spinning speed of 1000 m / min, and a nylon 6 monofilament undrawn yarn (90d / 1f) was once wound. This unstretched monofilament was stretched and wound according to the process shown in FIG. First, unstretched monofilament is supplied to the first roller 1 as a yarn A, and the first roller 1 has a surface speed of 200 m / min and the second roller 2 has a surface speed of 600 m / min. Thereafter (the first heater plate temperature, 130 ° C.), the relaxation ratio between the second roller 2 and the third roller 3 is changed as shown in Table 1, and the thermal relaxation process (the second heater plate temperature, 150 ° C.) is performed. gave. Thereafter, while being traversed by the ring rail 8 through the picktel guide 6 and the traveler 7, the speed of the ring rail 8 was changed, and the yarn was wound into a package 9 in a pirn winding form with a winding yarn length shown in Table 1. Table 1 shows the evaluation results of the shrinkage ratio of the monofilament before winding, the length of the wound yarn at the time of winding, the operability, and the quality of the woven fabric obtained from this monofilament.

Example 4, Comparative Examples 3 and 4 The relaxation treatment was performed at room temperature without using the second heater plate, and the relaxation rate was changed as shown in Table 1. The winding length was 25 m / half traverse, and Comparative Examples 3 and 4 had a winding length of 100 m /
The same operation as in Example 1 was performed except that the film was wound as a half traverse. Table 1 shows the results of the evaluation of the shrinkage ratio, operability, and woven quality of the woven fabric obtained from the monofilament before winding.

[0028]

[Table 1]

As is evident from Table 1, in Examples 1 to 4, good operability can be wound into a package in a good wrapped shape, and the filament wound on the pill has a small difference in physical properties. The woven fabric woven by using the filaments for the warp and the weft had few weaving defects (towing) and was of high quality. On the other hand, in Comparative Example 1, since the shrinkage rate of the monofilament before winding was too small, the tension in the relaxation treatment area was reduced, and the operability was deteriorated. Further, since the length of the wound yarn at the time of winding was too large, the defect using the wound monofilament was conspicuous.
In Comparative Example 2, the length of the wound yarn at the time of winding was too large.
The woven fabric using the wound monofilament had noticeable defects. In Comparative Examples 3 and 4, since the shrinkage ratio of the monofilament before winding and the length of the wound yarn at the time of winding were too large, the defect using the wound monofilament was conspicuous.

[0030]

According to the present invention, it is possible to obtain a package in the form of a pirn winding, which hardly causes a defect (pulling) even when used for the weft of a woven fabric, with a good winding shape and good operability.

[Brief description of the drawings]

FIG. 1 is a schematic process chart showing one embodiment of the present invention.

[Explanation of symbols]

 1: 1st roller 2: 2nd roller 3: 3rd roller 4: 1st heater plate 5: 2nd heater plate 6: picktel guide 7: traveler 8: ring rail 9: package in a wrapped form

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Nishida 5 Uji Tonouchi, Uji City, Kyoto Prefecture Unitika Co., Ltd. Uji Factory (72) Inventor Takehiko Yasui 5 Uji Tonouchi, Uji City, Kyoto 5 Unitika Co., Ltd. Uji Factory

Claims (4)

[Claims] Claims: 1. A polyamide undrawn yarn is drawn and its shrinkage ratio is
A method for winding polyamide fiber, comprising winding a yarn of 3.0 to 5.0% into a package in a pirn winding form at a winding yarn length of 25 to 50 m / half traverse. 2. The method of winding a polyamide fiber according to claim 1, wherein the stretching is hot stretching at 100 to 150 ° C. 3. The method for winding a polyamide fiber according to claim 1, wherein after the polyamide undrawn yarn is drawn, a heat relaxation treatment is applied at 130 to 180 ° C. at a relaxation rate of 1.1 to 5.0%. 4. The method for winding a polyamide fiber according to claim 1, wherein the undrawn polyamide yarn is a monofilament.