JP2000345442A - Production of low elongation and elasticity polyester filament yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production process for polyester filament yarns of high quality and high uniformity that can stably produce a polyester filament yarn of low-elongation and elasticity with no occurrence of package collap se, poor unreeling, yarn breakage and the like. SOLUTION: An undrawn or partially oriented polyester filament yarn is drawn with a drawing machine equipped with at least a pair of hot rollers to prepare a polyester filament yarn with an elongation modulus of 60-85% and followed by winding up the drawn filament yarn in a pirn form. At this time, take-up tension is maintained in a range of ± <=20% to the take-up tension at the start from the start to the end of winding-up operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a polyester filament yarn having a low elongation modulus. More specifically, the present invention relates to the production of a polyester filament yarn having a low elongation modulus which can provide a woven or knitted fabric excellent in swelling, softness and resilience when used as a mixed fiber.

[0002]

2. Description of the Related Art Polyester filament yarns are widely used in various fields including general garments because of their excellent properties including mechanical properties. In the use of clothing, the quality has been improved by using natural fibers as a target, but various studies have been made to obtain a swelling and soft texture. As one of the means,
Different shrinkage mixed yarns for mixing fibers having different shrinkage characteristics due to heat are widely used. If this type of shrinkage-differentiated yarn is used, a sufficient yarn length difference can be obtained after the dyeing process even if the density of the woven fabric increases, and a fabric excellent in swelling and softness can be obtained. As the yarn on the low shrinkage side of this shrinkage difference mixed yarn, a fiber having an extremely low boiling water shrinkage (hereinafter referred to as a fine shrinkage yarn) or a spontaneously elongated yarn showing extensibility with respect to the yarn before heat treatment during heat treatment is used. The swelling and softness of the fabric is brought out. These finely shrinkable yarns and spontaneously elongated yarns are characterized by having a lower elongation modulus than conventional polyester filament yarns.

A method for producing a spontaneously elongated yarn is described in, for example,
No. 4-352836 discloses a polyester partially oriented yarn (hereinafter referred to as PO).
Y (abbreviated as Y), and a relaxation heat treatment, and JP-A-2-93410 discloses a method of relaxing heat treatment of POY, which generally requires a relaxation heat treatment step. Also, JP-A-9-228167 and JP-A-9-21060
In the publication, a method using a fixed-length (tensile) heat treatment of POY is disclosed. However, in these methods, 2
Since a relaxation heat treatment of 0 to 50% is required, process stability is poor, and there is a problem in quality such as occurrence of yarn spots and dye spots. In addition, the processing speed is low, the success rate of the processing restart after the doff is low, and thus the productivity is low. Further, a special yarn processing machine capable of relaxation heat treatment is required, so that the production cost is high. For this reason, Japanese Patent Application Laid-Open No. 9-273043 proposes a method of obtaining a low shrinkage yarn by subjecting POY to contact heat treatment using a hot plate at a low tension, and discloses a manufacturing process diagram in which the yarn is wound into a drum shape. ing. However, in order to sufficiently reduce the shrinkage, the yarn tension during the heat treatment is set to 0.12 g / d.
In the case of contact heat treatment using a hot plate, the running of the yarn is not stable due to the abrasion resistance between the running yarn and the hot plate, so that there has been a problem that the yarn spots become large and the yarn breaks. Further, the present invention is different from the winding method of the present invention in that it is wound into a drum shape. further,
Because these low shrinkage yarns have a low elongation modulus, in the winding method used in the conventional drawing process, a change in the winding tension causes a change in quality in the pirn, a yarn shift in the pirn, the occurrence of collapse, There is a problem such as poor unwinding in the higher order process.
Therefore, in the prior art, it is difficult to obtain a polyester filament yarn having a low elongation modulus, including a low shrinkage yarn.

[0004]

An object of the present invention is to improve a conventional method of winding in a drawing step to reduce a polyester filament yarn having a low elongation modulus, such as a low shrinkage yarn, to collapse a package or to improve a higher order. It is an object of the present invention to obtain a high-quality polyester filament yarn with stable productivity without causing unwinding in the process and without occurrence of yarn breakage.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to draw an undrawn or partially oriented polyester filament yarn by a drawing machine having at least one pair of hot roller systems, and to have an elongation modulus of 60% or more and 85% or more. % Of polyester filament yarn which is less than or equal to 20% with respect to the winding tension at the beginning of winding, from the start of winding to the end of winding.
This can be achieved by a method for producing a polyester filament yarn having a low elongation modulus of less than or equal to.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
Polyester terephthalate (hereinafter abbreviated as PET), polypropylene terephthalate, polybutylene terephthalate, or the like is used as a raw material for the low elongation modulus polyester filament yarn in the present invention. PET is the most general and is preferred. Further, a part of the diol component and a part of the acid component may be substituted with another copolymerizable component in a range of 15 mol% or less. However,
In the case of polyethylene glycol, the content is preferably 10% by weight or less. These may also contain other polymers and additives such as matting agents, flame retardants, antistatic agents, pigments and the like. Hereinafter, a method for producing a low elongation modulus fiber using PET as a raw material will be described.

[0007] It is essential that the polyester filament yarn obtained in the present invention has an elongation modulus of 60 to 85%. FIG. 1 is an example of a load-elongation curve in elongation elastic modulus measurement. The elongation modulus decreases as the residual elongation after elongation increases. In other words, since the low elongation modulus polyester filament yarn has a large residual elongation after elongation, the yarn length can be maintained even after the elongation due to the restraining force at the time of forming a fabric as a differential shrinkage mixed fiber yarn is relaxed by relaxing refining or the like. . This yarn length retention forms a yarn length difference in the shrinkage-differentiated mixed yarn, and brings out a swelling feeling and a soft feeling of the fabric.

[0008] When the elongation modulus exceeds 85%, the swelling feeling and the soft feeling when made into a fabric are insufficient. Also,
Less than 60% means that the fiber structure is loose, resulting in reduced dimensional stability. Also, in the manufacturing process, the running of the yarn becomes extremely unstable, and stable production is difficult.

FIG. 2 is a schematic view of a stretching and heat treatment step showing a preferred specific embodiment of the production method of the present invention. An undrawn yarn or a partially oriented yarn 1 is wound several times around a first hot roll 3 and a separate roll 4 via a feed roll 2 and preheated, and is heated at a predetermined magnification between the first hot roll 3 and the second hot roll 5. It is drawn and heat-treated by the second hot roll 5 to form a drawn yarn. Next, a traveler 9 that slides on a ring 8 that traverses up and down through a stretch roll 6 and a lappet guide 7 that are not heated.
Is wound up as a pan 10.

In the manufacturing method of the present invention, as shown in FIG. 2, the number of rotations of the pan (hereinafter referred to as spindle rotation number) at the time of winding up is started by using a stretching machine having at least one pair of hot roller systems. From the start to the end of winding, adjust the traveler to be used as appropriate, and set the winding tension when winding as a pan within ± 20% of the winding tension at the beginning of winding from the beginning to the end of winding. As a result, the fibers having a low elongation modulus can be stably produced with uniform quality, without causing collapse of the package or unwinding failure in the higher-order process. To further improve the uniformity of quality and unwinding properties,
The winding is preferably performed with the winding tension set within ± 10% of the winding tension at the start of winding.

The winding tension is +2 with respect to the winding tension at the start of winding.
If it exceeds 0%, the yarn is distorted at the time of winding, so that the physical properties of the yarn change and it is difficult to obtain uniform quality. In addition, layer deviation occurs at a portion wound with a high winding tension, and eventually the package collapses. When the winding tension falls below -20% of the winding tension at the beginning of winding,
Due to a decrease in the winding tension, the yarn layer of the package shifts or collapses. In addition, a portion wound with a low winding tension comes off with the entire yarn layer during unwinding in a higher-order process (hereinafter, referred to as a missing loop), resulting in poor unwinding.

As means for keeping the winding tension within ± 20% of the winding tension at the start of winding from the start of winding to the end of winding, the spindle rotation speed is set according to the elapsed time from the start of winding. It is effective to suppress the fluctuation of the winding tension. It is also effective to optimize the traveler to be used according to the fineness of the low elongation modulus polyester filament yarn in order to suppress the quality change from the start to the end of winding.

[0013] With a normal polyester filament yarn having an elongation modulus of 95 to 100%, the winding tension is reduced temporarily to prevent buckling in the high-order process and to improve the unwinding property. I have. Further, the temporary decrease in the winding tension from the start of winding to the end of winding is about 50 to 70% of the winding tension at the start of winding. As the winding tension decreases and the pan diameter increases, the spindle rotation speed also decreases toward the end of winding.

In the winding method of the present invention, the spindle rotation speeds at the start and end of winding are reduced for a while, but the local increase of the winding tension due to the non-constant increase rate of the pan diameter during winding. In order to keep the winding tension at the start of winding within ± 20%, including a slight increase, the spindle rotation speed is set according to the winding time. Further, the winding tension at the start of winding is preferably 0.08 to 0.12 g / d in order to suppress a change in quality due to the winding tension. Is preferably 60 to 80 °.

[0015]

The present invention will be described more specifically with reference to the following examples and comparative examples. In addition, the following methods were used for the measurement method and the evaluation method in the examples. Table 3 shows the measurement results and the evaluation results. A. Elongation modulus Using ORIENTEO's RTC1210A, the initial sample length was set to 20 mm and the pulling speed was set to 2 mm / min.
The elongation modulus (%) at 3% elongation was determined according to the IS L1013 A method. B. Pan hardness HARDNESS TESTER "Ty"
The center of the pan was measured using "pe C". C. Winding tension and width of fluctuation of winding tension The winding tension was measured by measuring the running yarn tension on the wrappet guide using a tension checker CB type manufactured by Kanai Koki Co., Ltd. Then, recording was continuously performed during winding by a TYPE 30472 2-pen recorder manufactured by Yokogawa Electric Corporation.

The winding tension fluctuation range was calculated by the following equation using the winding tension at the start of winding and the maximum and minimum values of the winding tension.

ΔTmax = (Tmax−Ts) / Ts ΔTmin = (Tmin−Ts) / Ts ΔTmax: maximum value (%) of the winding tension fluctuation width ΔTmin: minimum value (%) of the winding tension fluctuation width Ts: winding D. Initial winding tension (g) Tmax: Maximum winding tension (g) Tmin: Minimum winding tension (g) Evaluation of uniformity of quality in the pan A standard deviation of the boiling water shrinkage in the longitudinal direction of the yarn was used as a scale for evaluating the uniformity of the quality in the pan.
Continuous measurement of the boiling water shrinkage in the yarn longitudinal direction of the low shrinkage yarn was performed using FTA-500 manufactured by Toray Engineering Co., Ltd. At this time, the yarn supply speed was 20 m / min, and the running yarn stress was 0.
The solution was passed through a wet heat treatment apparatus heated to 100 ° C. at 1 g / d and having a length of 15.5 cm. Then, the measurement was performed for 10 minutes, and the standard deviation of the shrinkage rate was obtained. At this time, the raw shrinkage was taken in as point data for every 3.3 cm of the measured yarn length, and these were combined into six points and averaged to obtain one data. Then, 1000 pieces of the data were collected, the standard deviation was calculated, and 0.25 or less was regarded as a pass. E. FIG. Package foam evaluation The package foam of the rolled-up pan was visually observed, and the degree of occurrence of yarn layer shift and package collapse was evaluated. The evaluation methods were as follows: ：: yarn layer displacement, no package collapse, Δ: thread layer deviation leading to occurrence of unwinding failure, ×: package collapse occurrence, and ○ passed. F. Evaluation of unwinding property The yarn was unwound from the pirn at an unwinding speed of 600 m / min, and the degree of occurrence of wheel slippage or unwinding failure was observed to evaluate the unwinding property. G. FIG. Fabric Evaluation The low elongation modulus polyester filament yarns obtained in Examples and Comparative Examples were 30 denier, 12 filament high shrinkage homopolymers having a boiling water shrinkage of 21.5% and a dry heat shrinkage of 19.5%. Air mixed using polyester filament yarn and interlace nozzle to produce shrinkage differential mixed yarn,
This was S-twisted at 300 turns / m, and plain weave was woven. This is subjected to relaxing refining at 98 ° C and 180 ° C
Was set in the middle. Further, the alkali was reduced by 10% by weight according to a conventional method, dyed, and finished at 180 ° C. Regarding the cloth obtained by the above method, the feeling of swelling and the feeling of softness were organoleptically evaluated on the 1st to 5th grades, and the 3rd or higher grade was accepted. Example 1 Using antimony trioxide as a polymerization catalyst, polyethylene terephthalate (PET) having an intrinsic viscosity (measured in an oxochlorophenol solvent at 25 ° C.) of 0.65 was obtained from terephthalic acid and ethylene glycol according to a conventional method. At this time, 0.4 wt% of titanium oxide having an average primary particle size of 0.5 μm was added as a matting agent. The obtained polymer is melt-spun at a spinning temperature of 284 ° C. and a spinning speed of 2500 m / min.
The 136.5 denier 48 filament POY was wound up.

Using a stretching machine having a pair of hot rollers as shown in FIG. 2, the temperature of the first hot roller 3 is 100 ° C., the temperature of the second hot roller 5 is 130 ° C., and the stretching ratio is 1.14 times. The stretching speed was set to 970 m / min, the traveler was # 23 manufactured by Kanai Kiko Kogyo Co., Ltd., and the spindle speed was set as shown in Table 1. 120 denier 4%
An 8-filament low elongation modulus polyester filament yarn was obtained. The maximum value of the winding tension fluctuation width is 10.5%, and the minimum value is -1.2%. The obtained polyester filament yarn has a standard deviation of the boiling water shrinkage of 0.12, a pirn hardness of 70 °, and a low elongation modulus polyester filament yarn having uniform quality is obtained. No collapse and unwinding failure occurred, and the package foam and unwindability were also good. In the evaluation of the fabric, a fabric excellent in swelling feeling and soft feeling was obtained. Example 2 A yarn was produced under the same conditions as in Example 1 except that the draw ratio was set to 1.20, and 110 denier 4 having an elongation modulus of 82%.
An 8-filament low elongation modulus polyester filament yarn was obtained. The fabric obtained from the mixed yarn using the obtained polyester filament yarn had good swelling and softness. The maximum value of the winding tension fluctuation width is 1
5.1%, the minimum value is -0.2%, the standard deviation of the boiling water shrinkage is 0.16, the pirn hardness is 78 °, and a low elongation modulus polyester filament yarn having uniform quality is obtained. In addition, no misalignment of the yarn layer, no collapse of the package, and poor unwinding did not occur, and the package foam and unwindability were also good. Example 3 A yarn was produced under the same conditions as in Example 1 except that the stretching ratio was changed to 1.07 times, and a 128 denier
An 8-filament low elongation modulus polyester filament yarn was obtained. The cloth obtained by the differential shrinkage mixed yarn using the obtained polyester filament yarn has a swelling feeling,
The soft feeling was particularly excellent. The maximum value of the winding tension fluctuation range is 8.7%, the minimum value is -17.6%, the standard deviation of the boiling water shrinkage is 0.14, and the Pann hardness is 63 °, and the quality is uniform. A polyester filament yarn having a low elongation modulus was obtained, and the yarn layer was not displaced, the package was not collapsed, and unwinding failure was not generated, and the package foam and unwindability were good. Examples 4 and 5 A yarn was produced under the same conditions as in Example 1 except that the number of spindle rotations was set as shown in Table 1, to obtain a polyester filament yarn having a low elongation modulus of 120 denier and 48 filaments.

When the fluctuation range of the winding tension is within the range of ± 20%, the standard deviation of the boiling water shrinkage ratio is 0.18 or less, and the yarn layer shift, the collapse of the package, and the unwinding failure did not occur. Also, in the evaluation of the fabric, a fabric having a very good swelling feeling and soft feeling was obtained.

[0020]

[Table 1] Comparative Example 1 A yarn was produced under the same conditions as in Example 1 except that the stretching ratio was 1.35 times, and 100 denier 4 having an elongation modulus of 87%.
An 8-filament polyester filament yarn was obtained.

The elongation modulus is beyond the scope of the present invention;
The fabric obtained from the differential shrinkage mixed yarn using the obtained polyester filament yarn lacked a swelling feeling and a soft feeling. Comparative Example 2 A yarn was produced under the same conditions as in Example 1 except that the draw ratio was changed to 1.02 times, and 135 denier 4 having an elongation modulus of 58% was used.
An 8-filament low elongation modulus polyester filament yarn was obtained.

Since the elongation modulus was lower than the range of the present invention and the fiber structure was loose and the dimensional stability was lowered, the package collapsed and unwinding was impossible. Comparative Examples 3 to 5 Example 1 except that the spindle speed was changed as shown in Table 2.
The yarn was produced in the same manner as in the above. In Comparative Example 3, the winding tension decreased toward the end of winding, and the width of fluctuation of the winding tension at the end of winding was -26.2%. Therefore, the pan hardness was as low as 50 °, and the package collapsed. Unwinding was also impossible. In addition, the standard deviation of the boiling water shrinkage ratio was as large as 0.70, and it was a low elongation modulus polyester filament yarn having a large variation in quality. In Comparative Example 4, the maximum value of the winding tension fluctuation range is 12.5%, which is within the range of the present invention. However, the minimum value is as low as -22.1%, and the Pann hardness is as low as 53 °. Due to the difference in tension, yarn layer displacement occurs,
Wheel unraveling occurred at the yarn layer shift occurrence part during unwinding. The standard deviation of the boiling water shrinkage was 0.52, and the uniformity of quality was poor. In Comparative Example 5, although the winding tension fluctuation range was close to the range of the present invention, the uniformity of the quality was improved, but the winding tension increased toward the end of winding, so that the pan hardness was as high as 85 °, and the In the surface layer portion, the yarn layer slippage occurred, and a wheel slippage occurred during unwinding.

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

According to the winding method of the present invention, a polyester filament yarn having an elongation modulus of 60% or more and 85% or less can be cut without causing breakage of a package or poor unwinding in a high-order process. It is possible to obtain a high-quality polyester filament yarn having stable productivity and uniform quality without generation of the like.

[Brief description of the drawings]

FIG. 1 shows an example of a load-elongation curve at the time of elongation elastic modulus measurement.

FIG. 2 is a schematic view of a stretching and heat treatment step showing an embodiment of the present invention.

[Explanation of symbols]

 1. Undrawn yarn 2. Feed roll 3. First hot roll 4. Separate roll 5. Second hot roll 6. Stretch roll 7. Lappet guide 8. Ring 9. Traveler 10. Pan

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Claims (1)

[Claims] An unstretched or partially oriented polyester filament yarn is drawn by a drawing machine having at least one pair of hot roller systems to obtain a polyester filament yarn having an elongation modulus of 60% or more and 85% or less. A low elongation modulus polyester, characterized in that when winding as a pan, the winding tension is set to within ± 20% of the winding tension at the beginning of winding from the beginning to the end of winding. Manufacturing method of filament yarn.