JP2859532B2 - Direct spin drawing method of nylon 6 fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of directly spinning and drawing nylon 6 fiber, and more particularly to a method of drawing at a low speed after melt-spinning, drawing and drawing at a high speed of 3000 m / min or more. It is.

[0002]

2. Description of the Related Art In order to improve the productivity, the speed of the melt spinning process is being increased. Japanese Patent Publication No. 1-23633 discloses that a melt spun yarn of polyamide is cooled and solidified and then an oil agent is added. A direct spinning and drawing method has been proposed in which the first godet roller takes up at a high speed exceeding 2000 m / min, stretches at a low magnification between the first godet roller and the second godet roller, heat-treats, and winds at a high speed. I have. Also, JP-A-62-199
No. 814 discloses that after a polyamide melt spun yarn is cooled and solidified, an oil agent is applied and the melting point of the melt is 5 to 115 ° C. lower than the melting point of the polymer.
A direct spin drawing method in which a drawing heat treatment is performed at a low temperature and then wound is described.

In the method described in Japanese Patent Publication No. 1-23633, the take-up speed of the first godet roller is high, and the surface temperature of the second godet roller is high. Due to the high heat treatment temperature, the resulting fiber has a low hot water shrinkage and a high thermal stress peak temperature. Therefore, there is a problem that the expression of shrinkage during the heat treatment in the post-processing step is very small, and the fabric obtained by knitting and weaving this fiber has a poor voluminous feel, and the applications that can be used for clothing are limited to a very small range. there were.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and exhibits a large degree of shrinkage during heat treatment in a post-processing step, and can impart a sufficient volume feeling to a knitted and woven fabric. It is an object of the present invention to provide a direct spinning and drawing method which can obtain a good winding of a package and obtain good productivity.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and have reached the present invention. That is, according to the present invention, the nylon 6 fiber is melt-spun, and after cooling, an oil agent is applied.
In the direct spin drawing method of drawing and winding between god rollers, a non-water-containing oil agent is used as an oil agent, and the first god roller pulls the wick at a speed of 2000 m / min or less, and the first god roller and the surface temperature are 50 to 100 ° C. Between two God Rollers
After stretching 1.5 to 3.5 times, the winding tension D / 25 to D /
The gist of the present invention is a direct spinning and drawing method of nylon 6 fiber, characterized in that it is wound at a speed of 3000 m / min or more at 10 g. Here, D is the fineness (denier) of the wound yarn.

The hot water shrinkage ratio in the present invention is determined as follows: a 22.5 m yarn wound 20 times by a measuring machine is converted into a skein, and a part of the skein is (1/30) × 20 × 2 (g / d). )
After measuring the length (length from the upper end to the lower end) of the yarn in this state, remove the load and treat in 100 ° C hot water for 30 minutes. Then, apply the same load to the treated yarn as before the treatment. The length of the yarn was measured by multiplying the length, and calculated from the difference in the yarn length before and after the hot water treatment. The thermal stress peak temperature is a temperature at which the first thermal shrinkage maximum stress peak is exhibited. Using a Kanebo Engineering thermal stressor, a 10 cm long yarn is formed into a loop, and the loop is formed similarly to the hot water shrinkage rate. Apply a load (1/30) x 2 (g / d) to a part,
The measurement was carried out at a heating rate of 2.5 ° C./sec, and the average value of 10 measurements was shown.

Hereinafter, the present invention will be described in detail. FIG. 1 is a schematic view showing one embodiment of a melt spinning apparatus to which the direct spinning and drawing method of nylon 6 fiber of the present invention is applied.

The yarn Y melt-spun through the spinneret 1
After being cooled and solidified by the cooling device 2, the non-water-containing oil agent is applied by the oil agent applying device 3. Next, after being taken up by the first god roller 4 and wound twice or more,
It is stretched between the godet roller 4 and the second godet roller 5 and heat-treated when it is wound twice or more around the second godet roller having a surface temperature of 50 to 100 ° C. After being applied, it is wound up on the package 7 at a high speed of 3000 m / min or more.

In the present invention, since the heat treatment performed by winding around the second godet roller is at a low temperature, uniform heat treatment is not possible if moisture is attached to the fibers. It is necessary to use an oil agent, but it may contain water if the water content is 10% or less.

The smoothing component used in the non-water-containing oil agent includes mineral oil, monobasic acid ester, polybasic acid ester, glycol ester, polyhydric alcohol ester, glyceride, block or random adduct of propylene oxide and ethylene oxide. And the like, and as an emulsifying component, polyoxyethylene alkyl ether, polyethylene glycol ester, polyhydric alcohol ester, polyoxyethylene polyhydric alcohol ester and the like can be used. Further, as the antistatic agent component, an anionic activator such as a sulfonate compound or an alkyl phosphate, or a cationic activator or an amphoteric activator can be used.

[0011] If necessary, a sizing agent, an antioxidant, an antibacterial agent, a dye and the like can be added. The non-water-containing oil agent thus mixed is preferably used with a melt viscosity of 20 centipoise or less, preferably 10 centipoise or less, and the melt viscosity can be adjusted by, for example, diluting with a low-viscosity mineral oil.

Next, the speed of the first godet roller needs to be 2000 m / min or less. If it exceeds 2000 m / min, the fiber orientation becomes high, the contraction stress of the drawn yarn is large, and a package having a good winding shape cannot be obtained. Further, the first godet roller is not particularly limited, but it is preferable to use a godet roller with a separate roller or a pair of Nelson rollers and use these without heating, and the number of times the yarn is wound around the first godet roller is In order to prevent the yarn from slipping on the roller surface at the time of stretching to cause unevenness in stretching, 2
It is preferable that the number of times be equal to or more than the number.

The surface temperature of the second god roller is 50-100 ° C.
It is necessary to be 60 to 95 ° C.,
More preferably, it is 75 to 90 ° C. If the surface temperature is less than 50 ° C., yarn breakage is likely to occur during stretching, and stable yarn cannot be produced. In addition, the heat treatment effect is insufficient, and the shrinkage stress of the fiber is too large, resulting in a defective winding package. Further, when the surface temperature exceeds 100 ° C., the hot water shrinkage of the obtained fiber decreases, and the thermal stress peak temperature increases,
Even if heat treatment is performed in the post-processing step, the occurrence of shrinkage is reduced.

Further, the winding tension at the time of winding is D / D
It is necessary to be 25 to D / 10 g, more preferably D / 20 to D / 15 g. If this tension is less than D / 25 g, the yarn sway at the outlet of the second godet roller becomes large,
The yarn is wound around the second godet roller, and the yarn breaks.
On the other hand, if the tension exceeds D / 10 g, the package will have a poor winding appearance, such as a broken yarn layer or a collapsed yarn tube when wound into a package. This tension is a value measured at a position 8 between the second godet roller 5 and the entanglement imparting device 6 in FIG. 1, and the difference in speed between the second godet roller 5 and the winding machine (relaxation rate) or the second godet roller 5 can be adjusted by changing the surface temperature and the traverse speed of the winder.

According to the present invention, nylon 6 fibers having a hot water shrinkage of 10% or more and a thermal stress peak temperature of 130 ° C. or less can be obtained. The nylon 6 fibers obtained by the present invention have The shrinkage during the heat treatment in the processing step is large, and the knitted and woven fabric can be given a sufficient volume feeling. Hot water shrinkage less than 10%,
If the fiber has a thermal stress peak temperature exceeding 130 ° C., shrinkage is small even if heat treatment is performed in a post-processing step, and a fabric knitted and woven using this fiber has a poor volume feeling.

[0016]

Next, the present invention will be described specifically with reference to examples. The methods for evaluating the physical properties of the yarns in the examples and comparative examples are as follows. The hot water shrinkage and the thermal stress peak temperature were measured as described above. (1) Strength, elongation-Measured with an initial load of 1/30 (g / d), a sample length of 25 cm, a down speed of 25 cm / min, a chart speed of 20 mm / min, using an S-100-C autograph manufactured by Shimadzu Corporation. The average value of 25 measurements was shown. (2) Yarn-producing property-The number of occurrences of yarn breakage per 24 hours was measured and evaluated in the following three stages. ○-No thread breakage △-1 or 2 times x-3 times or more (3) Package winding form-The yarn layer width in the axial direction of the package when winding the yarn on the paper tube is Acm, and after winding The maximum width of the yarn layer that swells in the package axis direction is B
cm, and the package swelling ratio was calculated by the following equation, and evaluated in four steps. Package swelling rate (%)-[(BA) / A] x 100 ◎-Package swelling rate is less than 5% ○-Package swelling rate is less than 5 to 10% △-Package swelling rate is 10 to 15% ×- Package swelling rate exceeds 15%

Example 1 Using the apparatus shown in FIG. 1, the relative viscosity (measured at a concentration of 1 g / dl and a temperature of 25 ° C. using 96% by weight sulfuric acid as a solvent) was 2.53.
Nylon 6 chips are melt spun at 260 ° C and the discharge amount is 26g
The melt spinning was carried out from a 24-hole spinneret at a rate of / min. After cooling and solidifying the spun yarn, 2% by weight of a non-water-containing oil agent having a water content of 1.0% was applied, and the speed was increased to 1200 by a first godet roller with a separate roller.
Take up at m / min and wind 3 turns, then the surface temperature is 50 ℃
Was wound five times around a second godet roller with a separate roller and stretched three times, and the winding speed was adjusted so that the winding tension became D / 15 g, thereby winding a 70 denier / 24 filament yarn. Table 1 shows the hot water shrinkage, the thermal stress peak temperature, the strength, the elongation, the yarn formability, and the winding appearance of the package of the obtained yarn.

Examples 2 to 6, Comparative Examples 1 to 11 The same procedure as in Example 1 was carried out except that the speed of drawing by the first godet roller, the surface temperature of the second godet roller, and the draw ratio were variously changed. Table 1 also shows the hot water shrinkage, thermal stress peak temperature, strength, elongation, yarn formability, and package winding appearance.

[0019]

[Table 1]

As is evident from Table 1, in Examples 1 to 6 of the present invention, the yarn production was good, the winding appearance of the obtained package was good, and the product could be produced with high productivity. Also,
The obtained fiber has a hot water shrinkage of 10% or more and a thermal stress peak temperature of 130 ° C. or less, and when subjected to a heat treatment in a post-processing step, it is possible to obtain a yarn which is excellent in shrinkage development and bulky. did it. On the other hand, in Comparative Examples 1 to 2 and 5 to 6 in which the surface temperature of the second godet roller was low, fluff and yarn breakage occurred frequently during stretching, and both the yarn formability and the winding appearance of the package were poor.
In Comparative Examples 3 to 4 and 7 to 8 in which the surface temperature of the second godet roller was high, the yarn swaying near the second godet roller was large, and the yarn breakage occurred, so that the yarn forming property was poor and the obtained fiber When the hot water shrinkage was less than 10%, the peak temperature of the thermal stress exceeded 130 ° C., and even when heat treatment was performed in the post-processing step, the shrinkage was small. Further, in Comparative Examples 9 to 11 in which the take-up speed of the first god roller was 3000 m / min, the yarn-forming properties were
The winding appearance of the package was also poor, and the obtained fiber had a hot water shrinkage of 10% or less, and showed little shrinkage even after heat treatment in a post-processing step.

[0021]

According to the present invention, a nylon 6 fiber which exhibits a large shrinkage during heat treatment in a post-processing step and can impart a sufficient volume feeling to a fabric obtained by knitting and weaving this fiber, It is possible to satisfactorily roll up the package and obtain good productivity.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a direct spin drawing method for nylon 6 fiber of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinneret 2 Cooling device 3 Oil application device 4 1st god roller 5 2nd god roller 6 Entangling nozzle 7 Package Y yarn

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D01F 6/60

Claims (2)

(57) [Claims] 1. A direct spin drawing method in which a nylon 6 fiber is melt-spun and cooled, an oil agent is applied, and stretched and wound between a first godet roller and a second godet roller. 2000m / with the first god roller
And stretched 1.5 to 3.5 times between the first godet roller and the second godet roller having a surface temperature of 50 to 100 ° C., and then 3000 m at a winding tension D / 25 to D / 10 g.
Nylon 6 characterized in that it is wound at a speed of not less than / min.
Direct spin drawing method of fiber. Here, D is the fineness (denier) of the wound yarn. 2. A nylon 6 fiber obtained by the direct spinning and drawing method according to claim 1, which has a hot water shrinkage of 10% or more and a thermal stress peak temperature of 130 ° C. or less.