JP2003201062A - Polyester multi-filament package and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polytrimethylene terephthalate multi-filament package allowing the production of superior quality drawn and temporarily-twisted yarns causing less breakage and fluff even in drawing and temporary twisting after storage. <P>SOLUTION: The polyester multi-filament package comprises polytrimethylene terephthalate multi-filaments having a double refraction index of 0.040-0.060 and a hot water shrinkage percentage of 3-30%. The cheese package has a saddle percentage of 3% or less and a saddle charging percentage of 20% or less. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a package in which a polyester multifilament made of polytrimethylene terephthalate is wound like cheese. More specifically, the present invention relates to a multifilament package made of polytrimethylene terephthalate, which has less trait variation with time and has excellent processability in drawing false twisting, and a method for producing the same.

[0002]

2. Description of the Related Art Polytrimethylene terephthalate fibers are widely used as stretch materials for clothing because they have excellent elongation elastic recovery rate, low Young's modulus, easy dyeability and are chemically stable. Is being done.

In such a method for producing polytrimethylene terephthalate fiber, an undrawn yarn that has been once wound after melt spinning is drawn, or a highly oriented yarn (hereinafter referred to as POY) that is wound at a high speed is temporarily drawn. A method of twisting (hereinafter referred to as “drawn false twist”) is general.

However, polytrimethylene terephthalate has a so-called aging effect since it has a high glass transition temperature due to its low glass transition temperature of 30 to 50 ° C. and its molecular motion is active even in a low temperature atmosphere such as in the manufacturing process. Is easy to progress. That is, the spun-up polytrimethylene terephthalate multifilament package has a decreased process passability in the drawing false twisting process with time, and the obtained polytrimethylene terephthalate fiber has many quality irregularities.

Further, since polytrimethylene terephthalate has a high elastic recovery rate, the stress at the time of winding and winding it by spinning easily remains without being relaxed, and there is a problem that the package is distorted by being tightened with time. Heretofore, several attempts have been made to improve the aging of such a spun-up polytrimethylene terephthalate multifilament package. For example, JP-A-58-1
No. 04216 discloses that polytrimethylene terephthalate is melt-spun at a spinning speed of 2000 m / min or more to improve the stability with time of an undrawn polytrimethylene terephthalate multifilament as an undrawn yarn having a birefringence of 0.035 or more. A method of causing is disclosed. However, in an unstretched polytrimethylene terephthalate multifilament simply spun at such a speed, package distortion and structural change of the multifilament itself occur due to winding in a few hours, and the process of stretching false twisting process occurs. The passability deteriorates with the passage of time, and the drawn false-twist textured yarn obtained is a defective product with a lot of fluff, stains and the like.

Further, in Japanese Patent Laid-Open No. 11-302919, a polytrimethylene terephthalate multifilament, which is melt-spun and rapidly cooled, is provided between a first roller heated to 40 to 70 ° C. and a second roller heated to 120 to 160 ° C. When a polytrimethylene terephthalate multifilament that has been stretched or melt-spun and rapidly cooled is wound up without stretching, the multifilament is rapidly cooled to (the glass transition temperature of the polymer + 20 ° C) or less before winding up. The method of obtaining a polytrimethylene terephthalate cheese-like package having a bulge rate of less than 10% is disclosed. However, since the polytrimethylene terephthalate multifilament thus obtained is a drawn yarn that exceeds the category of POY in the former case, a sufficient draw ratio cannot be obtained even when subjected to a draw false twisting process, and a preferable crimp It is not possible to obtain a drawn false twisted textured yarn having performance. On the other hand, in the latter, although it falls into the category of POY, its effect of suppressing the change over time is still insufficient.

Further, in Japanese Unexamined Patent Publication No. 2001-64824, a highly oriented unstretched polytrimethylene terephthalate multifilament whose time-dependent change is improved by heat-treating and winding at a spinning speed of 2500-4500 m / min. Is disclosed. Although the structure of the polytrimethylene terephthalate multifilament itself is improved by the heat treatment while taking up the fiber, it is difficult for the package to change with time. There is a problem that quality spots occur.

In Japanese Patent Laid-Open No. 2001-20136, polytrimethylene terephthalate multifilaments which have been melt-spun and rapidly cooled are heat treated at 50 to 170 ° C., and then wound up at a tension of 0.02 to 0.20 g / d. At 2
A method of winding at a speed of 000 to 4000 m / min is disclosed. Certainly, according to this method, the height of the obtained package is small, and the polytrimethylene terephthalate multifilament constituting the package is also less changed with time as long as it is observed in a short time. However, depending on the aging conditions, 1 after winding
Even in the period of about a week, the height of the package progresses, the process passability in the draw false twisting process deteriorates, and the obtained draw false twisted yarn often has fluffs, stains, etc. There's a problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been made against the background of the above-mentioned prior art, and its purpose is to reduce the secular change of the package ears after winding and to provide excellent processability in the drawing false twisting process. Another object of the present invention is to provide a polyester multifilament package made of polytrimethylene terephthalate, which can stably obtain a drawn false-twist textured yarn of good quality, and a method for producing the same.

[0010]

According to the research by the present inventor, the above-mentioned problem is that the birefringence is 0.040 to 0, which is composed of polyester in which 90 mol% or more of all repeating units are trimethylene terephthalate units. A polyester multi-filament package which is a cheese-like package in which a multi-filament having a hot water shrinkage ratio of 0.060 and 3 to 30% is wound and which simultaneously satisfies the following (1) to (2): ) Package ear height is 3% or less. (2) Package ear height change rate is 20% or less, and melt-spinning is performed when melt-spinning polyester in which 90 mol% or more of all repeating units are trimethylene terephthalate units. The solidified polyester is cooled and solidified, taken through the rotating roller 1 at a speed of 2000 to 3200 m / min, and then stretched. 70-12 without doing
It has been found that this can be achieved by a method for producing a polyester multifilament package, which comprises heat-treating with a rotating roller 2 heated to 0 ° C., then cooling with a non-heating rotating roller 3, and then winding up into cheese. It was

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The polyester multifilament package of the present invention is intended for those in which the polymer component constituting the multifilament is polyester in which 90 mol% or more of all repeating units are composed of trimethylene terephthalate units.

The polyester may be copolymerized with other components in a proportion of 10 mol% or less, preferably 5 mol% or less, based on the total acid components. Examples of the copolymerization component preferably used include phthalic acid, isophthalic acid, naphthalene dicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid as an acid component, and ethylene glycol as a glycol component. Butylene glycol, neopentyl glycol, bisphenol A, 2,2-bis {4-
Examples include (β-hydroxyethoxy) phenyl} propane.

Various additives such as a matting agent such as titanium oxide, a heat stabilizer,
An ultraviolet absorber or the like may be contained if necessary.
The intrinsic viscosity (measured at 35 ° C. using orthochlorophenol as a solvent) of the polyester is preferably in the range of 0.4 to 1.5, particularly preferably 0.7 to 1.2.

The polyester multifilament of the present invention comprising the above polyester has a birefringence of 0.040 to.
0.060, shrinkage rate of hot water (immersion treatment in warm water at 65 ° C. for 30 minutes) needs to be 3 to 30%. When the birefringence is less than 0.040, molecular movement easily occurs even at room temperature, so that the change over time of the multifilament progresses extremely rapidly, and fluff and yarn breakage occur in the drawing false twisting process. In addition to this, the unevenness of the drawn false twisted yarn is increased, which is not preferable. On the other hand, if the birefringence exceeds 0.060, a sufficient draw ratio cannot be obtained during the drawing false twisting process, and only a processed yarn different from the drawn false twisting processed yarn can be obtained. A more preferable range of birefringence is 0.45 to 0.55.

Further, even when the hot water shrinkage exceeds 30%, molecular movement easily occurs at room temperature, so that the change with time of the multifilament progresses extremely rapidly, and fluff and yarn breakage occur in the drawing false twisting process. Not only the extremely large amount occurs, but also the uneven dyeing of the drawn false twisted yarn increases, which is not preferable. It is preferable that the hot water shrinkage rate is as low as possible, and 20% or less is more preferable. However, if it is made too low, yarn breakage is likely to occur due to the heat treatment carried out during the drawing false twisting process, so it should be avoided to be less than 3%.

In the polyester multifilament package of the present invention, it is essential that the above-mentioned multifilaments be wound in a cheese shape so as to simultaneously satisfy the following (1) and (2). (1) Ear height of the package is 3% or less. (2) Ear height change rate of the package is 20% or less. Here, the ear height is the maximum winding diameter (Dmax) of the package end and the minimum winding of the package in FIG. The difference (Dmax-Dmin) between the diameters (Dmin), and the ear height (%) is [(Dmax-Dmin) / Dmin] × 100. The ear height change rate is the ear height (Hb0) of the package immediately after winding and the package height at room temperature (about 27 ° C).
It is calculated by the following formula from the ear height (Hb7) after holding for a week. Ear height change rate (%) = [(Hb7−Hb0) / Hb0] ×
100

When the height of the edge of the package exceeds 3%, when the multifilament is unwound from the package in the drawing false twisting process, the edge of the package is apt to be caught by the twisting of the false twisting tension of the package. Often causes thread breakage. Further, even immediately after winding, the stress applied to the multifilament at the end of the package is different from that at the center, so that the multifilament at the end and the center is potentially heterogeneous. A package having an ear height ratio of 2% or less is more preferable.

The ear height of the package immediately after winding is 3%
Even if it is less than the following, when the rate of change in the ear height exceeds 20%, the structural difference of the multifilament between the package end portion and the central portion increases with time, so that the yarn breakage due to the variation of the drawn false twist tension frequently occurs. This is not preferable because it tends to occur, and the drawn false-twisted yarn obtained also becomes a quality defective product with a lot of fluff and stains. It should be noted that a package having an ear height change rate of 10% or less is more preferable.

The cross-sectional shape of the single filament of the multifilament according to the present invention is not particularly limited and may be circular,
A triangular shape, a flat shape, a multilobe shape of 3 to 8, a hollow shape can be appropriately selected according to the purpose of use.

The polyester multifilament package of the present invention described above can be manufactured, for example, by the following method. That is, 90 of all repeating units
Polyester pellets containing more than mol% of trimethylene terephthalate units are dried by a conventional method, melted by a melt spinning device equipped with a screw extruder, and then discharged through a known spinneret, and a cooling air is supplied to a molten polymer stream. After spraying, cooling and solidification, and applying a desired oil emulsion as necessary, 2000-3200 m / min, preferably 24 through the rotating roller 1, for example, a godet roller.
Collect at a speed of 00 to 2800 m / min.

Here, when the take-up speed is less than 2000 m / min, the birefringence of the obtained polyester multifilament is less than 0.040, while when the take-up speed exceeds 3200 m / min, the birefringence is 0. Since it exceeds 060, it is not preferable. It should be noted that the rotating roller 1 is preferably a substantially non-heated roller, because if the temperature becomes too high, the yarn easily breaks.

The drawn multifilaments are 70 to 120 ° C., preferably 8 ° C., without subsequent stretching.
It is necessary to perform heat treatment with the rotating roller 2 heated to 0 to 110 ° C. When the roller temperature is less than 70 ° C,
Not only the shrinkage rate of hot water of the obtained polyester multifilament exceeds 30%, but also the ear height change rate of the package exceeds 20%, which is not preferable. Conversely 1
When it exceeds 20 ° C., not only the shrinkage rate of hot water becomes less than 3%, but also the rotating roller 2 and the rotating roller 3 described later.
The yarn tension fluctuates significantly between the two, making it difficult to obtain a package having a normal shape, and yarn breakage due to yarn wobbling on the rotating roller 2 easily occurs and spinning stability deteriorates. Is not preferred.

During the heat treatment with the rotating roller 2, the multifilament is turned on the rotating roller 2 through the separator 5 to 8 times depending on the fineness of the multifilament, the traveling speed, the diameter of the rotating roller 2, the temperature, and the like. Preferably. In addition, during the heat treatment, the multifilament may be relaxed or extended within a range that does not impair the object of the present invention, but it is preferable to perform the heat treatment with a substantially constant length.

In the present invention, it is important that the multifilament heat-treated as described above is once cooled by the non-heated rotating roller 3 and then wound into a cheese shape. If the running yarn is directly supplied to the winder from the heated rotating roller 2 without passing through the non-heated rotating roller 3, the yarn tension may fluctuate or the yarn may sag, so that the package can be stably packaged. Is difficult to form.

If an air entanglement device is installed between GR1 and GR2 and the yarn is entangled to about 0.5 to 20 yarns / m, the process passability in drawing false twisting is better. Therefore, it is preferable.

[0026]

EXAMPLES The present invention will be described in more detail below with reference to examples. Each item in the examples was measured by the following method.

(1) Spinning breakage rate (%) The number of spinning breakages generated during the operation of the spinning machine is recorded, excluding the breakages caused by artificial or mechanical factors, and the spinning breakage rate (%) is calculated by the following formula. ) Was calculated. Spinning breakage rate (%) = [number of breaks / (number of operating winders x
Number of doffs)] × 100 Here, the number of doffs means the number of times the package is wound up to a specified amount, and the winder is a four-winder take-up winder.

(2) Ear height ratio (%) For a 10 kg wound package, the maximum wound diameter (Dmax (mm)) near the end and the minimum wound diameter (Dmi) near the center.
n (mm)) is measured and the difference is measured by ear height (Hb (mm))
= Dmax-Dmin) and calculated by the following formula. Ear height (%) = Hb / Dmin × 100 (3) Ear height change rate For a 10 kg wound package, the ear height (Hb0) of the package immediately after winding and the room temperature (about 27
It was calculated from the ear height (Hb7) measured value after holding for 1 week at (° C.) by the following formula. Ear height change rate (%) = [(Hb7−Hb0) / Hb0] ×
100

(4) Birefringence index It was determined from the retardation of polarized light observed on the surface of the fiber using an optical microscope and a compensator.

(5) Warm water shrinkage (%) 0.27 cN / dt using a measuring machine with a frame circumference of 1.125 m.
An initial load of ex is applied, and the tape is wound back at a speed of 120 times / min to form a small cassette with 40 windings, and a load 20 times the initial load is applied to measure the cassette length L0 (mm). Next, remove the load, soak the sample in warm water at 65 ° C for 30 minutes, take it out, let it dry naturally, and apply a load 20 times the initial load again to measure the length L1 (mm) of the hot water. Was calculated. Warm water shrinkage (%) = (L0-L1) / L0 × 100

(6) Number of Entanglements (Units / m) Using a YT-2 type interlace measuring device manufactured by Teijin Engineering Ltd., the number of entanglements of a polytrimethylene terephthalate multifilament sample 10m was measured in measurement mode 3.

(7) Draw False Twist Breakage Ratio The draw false twist breakage ratio is recorded by the following formula by recording the number of breakages generated during the operation of the draw false twisting machine, excluding the breakage caused by artificial or mechanical factors. (%) Was calculated. Drawing false twist yarn breakage rate (%) = [number of yarn breaks / (number of operating weights x number of doffs)] x 100 Here, the number of doffs refers to the number of times the false twist textured yarn package is wound up to a specified amount.

[0033] (8) fluff number (pieces / 10 ⁴ m) using a Toray Co. DT-104 type fluff counter device, draw-twisted yarn of 500 meters / min at a rate of 20 minutes continuous measurement to occur The number of fluffs was counted.

(9) Approximately 40 m of dyed and stretched false-twisted yarn is used as a cylindrical knit, and washed with water for 5 minutes, and at the rate of 2% of the sample, teratop blue (Ciba
Using Specialty Chemicals Co., Ltd., and using Polyesca DS (manufactured by Tatsuyo Chemical Industry Co., Ltd.) at a ratio of 0.2% of the dyeing bath solution at 40 ° C. for 10 minutes, then leaving it for 30 minutes. The temperature was raised to 100 ° C., and the dyeing was performed at 100 ° C. for 30 minutes. After drying for 10 minutes, the inspector visually judged the stains on the dyed cylinder knit and rated them according to the following criteria. Level 1: Dyeing is uniform with no streaky spots or spots. Level 2: Slightly streaky or spotted spots are observed, but acceptable as a good product. Level 3: Many strong streak-like or large speckled spots are observed.

[Examples 1 to 3] Polytrimethylene terephthalate pellets having an intrinsic viscosity of 1.05 measured with o-chlorophenol at 35 ° C were dried at 140 ° C for 5 hours and then melted with a screw type extruder. It is melted in a spinning facility and introduced into a spin block at 255 ° C with a pore size of 0.3.
From the spinneret (5 in FIG. 2) in which 48 5 mm discharge holes are concentrically arranged, discharge was performed at the flow rate shown in Table 1 for each example. The discharged molten polymer flow is cooled and solidified by the air flow ejected from the cross-flow type air blower (6 in Fig. 2), and the nozzle type oil supply device (7 in Fig. 2) installed 80 cm below the spinneret. ), Condensing while refueling, and performing confounding treatment with an air nozzle (9 in FIG. 2), Table 1 for each example
Rotating roller 1 (GR that rotates at the surface speed shown in
1: Rolling roller 2 (GR2: 1 in FIG. 2) which was taken up by 8) in FIG. 2 and heated to the temperature shown in Table 1 for each example.
0) through the separator (11 in FIG. 2) for 7 turns for dry heat treatment, and then run on the unheated rotating roller 3 (GR3: 12 in FIG. 2) which is not actively heated. 10 kg of polytrimethylene terephthalate multifilament package (14 in FIG. 2) by winder (13 in FIG. 2) at the winding speed shown in Table 1 for each example.
It was rolled up as. Table 2 shows the spinning yarn breakage rate, the physical properties of the polytrimethylene terephthalate multifilament, the package ear height and the ear height change rate.

[0036]

[Table 1]

[0037]

[Table 2]

Further, the package stored for one week was wound by a Scrug SDS-8 type false false twisting machine equipped with a urethane disk having a diameter of 45 mm as a false twisting tool under the conditions of the false false twists shown in Table 3 to wind 10 kg. 2.5k from package
Operation was performed by a method of preparing four g-winding false twisted yarn packages to obtain drawn false twisted yarns each having the characteristics shown in Table 4. The drawn false twist yarn breakage rate, the number of fluffs, and the uneven dyeing are the results shown in Table 4, respectively.

[0039]

[Table 3]

[0040]

[Table 4]

Comparative Example 1 A 10 kg polytrimethylene terephthalate multifilament package was wound up under the same conditions as in Example 1 except that GR2 was not heated. Table 2 shows the spinning breakage rate, the physical properties of the polytrimethylene terephthalate multifilament, and the selvage height of the package. Further, this package was stored under the same conditions as in Example 1, and the false false twisting was performed under the conditions shown in Table 3 using the same false twisting tool and the same drawing false twisting machine as in Example 1. Table 3 summarizes the package height change rate, drawn false twisted yarn characteristics, drawn false twist yarn breakage rate, number of fluffs, and spotting results.
Shown in.

Comparative Example 2 An attempt was made to wind up a 10 kg polytrimethylene terephthalate multifilament package under the same conditions and methods as in Example except that the yarn after passing through GR2 was directly wound up by Winder without using GR3. . However, according to this method, the tension of the wound-up yarn greatly fluctuates, the yarn is slackened, and a stable 10 kg package cannot be obtained.

[0043]

EFFECTS OF THE INVENTION The polytrimethylene terephthalate multifilament package of the present invention is suppressed in quality variation with time, and therefore has a process passability during drawing false twisting process even if the time before drawing false twisting process changes. The drawn false-twisted yarn obtained is less likely to deteriorate, and the obtained drawn false-twisted yarn also has less fluffing, and has excellent quality with less uneven dyeing.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an ear height of a package.

FIG. 2 is a process schematic diagram showing one embodiment of the melt spinning apparatus used in the present invention.

[Explanation of symbols]

1, 14: Package 2: Paper core 3: Minimum winding diameter of package (Dmin) 4: Maximum winding diameter at package end (Dmax) 5: Spinneret 6: Blower 7: Refueling device 8: Rotating roller 1 9: Air nozzle 10: rotating roller 2 11: Separator 12: rotating roller 3 13: Winder

Claims (3)

[Claims] 1. A multifilament having a birefringence of 0.040 to 0.060 and a hot water shrinkage of 3 to 30%, which is made of polyester in which 90 mol% or more of all repeating units are trimethylene terephthalate units. A polyester multifilament package characterized by satisfying the following (1) and (2) at the same time. (1) Package ear height is 3% or less (2) Package ear height change is 20% or less 2. When melt-spinning a polyester in which 90 mol% or more of all repeating units are trimethylene terephthalate units, the melt-spun polyester is cooled and solidified, and 2000-3200 m / m through a rotating roller 1.
at a speed of in and without subsequent stretching 70
A method for producing a polyester multifilament package, which comprises heat-treating with a rotating roller 2 heated to 120 ° C, then cooling with a non-heating rotating roller 3, and winding up into cheese. 3. The method for producing a polyester multifilament package according to claim 2, wherein an entanglement treatment with an entanglement degree of 1 / m or more is performed between the unheated rotating roller 1 and the heated rotating roller 2.