JP2002348746A - Method for producing false-twisted yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing false-twisted yarn, capable of stably producing the false-twisted combined filament yarn of high quality, by subjecting undrawn combined filament yarn containing yarn threads of a polyester to which a polymethyl methacrylate-based polymer and/or a polystyrene- based polymer are added to drawing and false-twisting at a high speed. SOLUTION: This method for producing the false-twisted yarn comprises subjecting the undrawn combined filament yarn containing the yarn threads of the polyester to which the polymethyl methacrylate-based polymer and/or the polystyrene-based polymer are added to drawing and false-twisting, wherein the following conditions (1) to (4) are satisfied: (1) the yarn threads are subjected to entangling by air before drawning and false-twisting; (2) twisting and untwisting of the yarn threads is carried out by using a disk having a diameter of 50-70 mm; (3) an angle of traveling of the yarn threads to the rotation axis of the disk is set to be 38-48 deg.; and (4) a number of the false-twisting is set to be (15,000-35,000)/[size of the false-twisted yarn (dtex)]<1/2> turn/m.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of simultaneously drawing and untwisting a polyester undrawn mixed yarn comprising a yarn to which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer is added.

[0002]

2. Description of the Related Art Polyesters are widely used as clothing fabric materials by utilizing their excellent properties. Natural, favorable characteristics brought by the irregularity of fiber physical properties possessed by natural fibers, along with diversification, luxury, individualization of clothing life,
For example, attempts to realize “feel close to wool” with polyester fibers have been continued.

For example, Japanese Patent Application Laid-Open No. 58-98418 discloses that a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer may be used as a substrate polyester in an amount of 0.1%.
The mixture added at 3 to 5% by weight and the substrate polyester are discharged from the same spinneret, wound up under specific spinning conditions, and then subjected to a simultaneous draw-twisting (hereinafter referred to as drawing / false twisting) process. A method for producing a false twist mixed yarn is described.

However, when an undrawn mixed yarn containing a polyester yarn to which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer has been added is drawn and false-twisted, the false twist tension varies greatly, and the yarn breakage occurs. However, there is a problem that the false-twisted mixed yarn obtained has many fluffs. In particular, at a speed of 800 m / min or more, it has been difficult to stably draw and false-twist such an undrawn mixed fiber.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an undrawn mixed fiber comprising a polyester yarn to which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer has been added, and to provide a high-speed, stable yarn. To provide a method for producing high-quality false twist mixed fiber yarns.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, the following (1) to
By stretching and false-twisting under conditions that simultaneously satisfy (4), a high-quality false-twisted mixed fiber including polyester yarn to which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer is added can be stabilized. That it can be manufactured. (1) The yarn is air-entangled before drawing and false twisting. (2) Twisting / untwisting is performed using a disk having a diameter of 50 to 70 mm. (3) The running angle of the yarn with respect to the rotation axis of the disk is 38
To 48 degrees. (4) The number of false twists is (15000 to 35000) / (false twist fineness (dtex)) ^1/2 times / m.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. The polyester used in the present invention is at least 85 mol%, preferably at least 95 mol% of all repeating units.
The above is the polyester composed of ethylene terephthalate. A small amount (usually 15 mol% or less based on the terephthalic acid component) of a component other than the terephthalic acid component and the ethylene glycol component may be copolymerized. The intrinsic viscosity (measured at 35 ° C. using orthochlorophenol as a solvent) of the polyester used in the present invention is preferably one having an intrinsic viscosity of 0.7 or less in the same category as the polyester usually used as a cloth material for clothing. In addition, these polyesters, known additives, for example, pigments, dyes, matting agents, antifouling agents, optical brighteners, flame retardants, stabilizers,
It may contain an ultraviolet absorber and a lubricant.

To such a polyester, a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer is added and melt-spun. (Hereinafter referred to as an undrawn mixed fiber). The polymethyl methacrylate-based polymer or polystyrene-based polymer used may be an amorphous polymer having an atactic or syndiotactic structure.
Further, a crystalline polymethyl methacrylate-based polymer or a polystyrene-based polymer having an isotactic structure may be used. The amount of the polymethyl methacrylate-based polymer and / or polystyrene-based polymer added to the base polymer made of the polyester is as follows:
The amount is preferably in the range of 0.3 to 5.0% by weight so that the elongational viscosity of the polymer stream is reduced and the orientation crystal is suppressed sufficiently.

[0009] By adding the polymer, melting,
A decrease in the elongational viscosity of the discharged polymer stream and suppression of oriented crystals are exhibited, a thinning process different from that of the polyester single yarn is developed, and as a result, even if the spinning speed is the same, both yarns are consequently separated. Causes a difference in physical properties. It is preferable to set the elongation difference between both yarns in the range of 80% to 250% in consideration of the texture of the final fabric.

FIG. 1 shows one example of the drawing / false twisting step of the present invention.
It is a schematic diagram which shows an embodiment. The undrawn mixed fiber (1)
The air is entangled with air by an interlace nozzle (4) provided between two pairs of feed rollers (3, 3 ') via a guide (2), and is supplied to a stretching / false twisting area. Next, while being stretched between the feed roller (3 ') and the first delivery roller (8), twisting is performed by friction with the rotating disk (7). Subsequently, it is heat-treated by the first heater (5), cooled by the cooling plate (6), passed through the disk (7) and untwisted. Furthermore, the running yarn is the first delivery roller (8).
Reheated by a second heater (9) installed between the first delivery roller (10) and the second delivery roller (10).
In 1), it is wound up as a package (12) to produce a false twist mixed fiber. The first heater (6) and the second heater (9) are preferably of a non-contact type in consideration of high-speed stretching and false twisting. Note that this reheat treatment may be omitted depending on the use of the false twist mixed fiber.

[0011] An undrawn mixed fiber including a yarn to which oriented crystals are suppressed by adding a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer is drawn and drawn under conditions for drawing and false-twisting ordinary polyester fibers. When false twisting is performed, the running yarn often fluctuates in tension, causing the running of the yarn to become unstable and leading to yarn breakage. Such a phenomenon becomes remarkable as the stretching / false twisting speed increases, and 800
At a speed of at least m / min, it is difficult to perform stretching and false twisting stably. In addition, if the tension of the false twisting side (twisting tension) is increased to stabilize the running of the yarn, the false twisting side tension (untwisting tension) increases as the twisting tension increases, and the tension is further reduced. Threads are generated. In addition, the false twist mixed fiber obtained by such drawing and false twist processing has a very large amount of fluff and few of them can be used as good products.

The present inventors have drawn and false-twisted the undrawn mixed fiber under the conditions that simultaneously satisfy the following (1) to (4), so that yarn breakage occurs even at a speed of 800 m / min or more. It has been found that it is possible to produce a high-quality false twisted mixed yarn with extremely little and no fluff. (1) The yarn is air-entangled before drawing and false twisting. (2) Twisting / untwisting is performed using a disk having a diameter of 50 to 70 mm. (3) The running angle of the yarn with respect to the rotation axis of the disk is 38
To 48 degrees. (4) The number of false twists is (15000 to 35000) / (false twist fineness (dtex)) ^1/2 times / m.

In the present invention, first, it is necessary to previously air-entangle the undrawn mixed fiber supplied to the drawing / false twisting apparatus. When air entanglement is not performed, the yarns constituting the undrawn mixed yarn are poorly mixed with each other, and the yarn may be broken and twisted due to poor unwinding.
Single yarn breakage during untwisting or strong streaky spots on woven fabric. In addition, the crimping performance of the obtained false twist mixed fiber becomes poor.

Although the air entanglement may be performed separately from the stretching and false twisting, a method of installing an interlace nozzle in the stretching and false twisting device and performing the air entanglement immediately before stretching and false twisting as shown in FIG. Is preferred. The degree of air entanglement differs depending on the type of the interlace nozzle, but the hole diameter is 1.0 to 3.0 mm.
When the interlaced nozzle of the compressed air blowing hole is used, the air flow rate per interlaced nozzle is 5
It is desirable to perform the air entanglement treatment so as to be 0 to 120 nL / min.

Next, a disk having a diameter of 50 to 70 mm,
More preferably, twisting and untwisting must be performed using a disk having a diameter of 58 to 62 mm. The disk is assembled and used, for example, as a false twist unit in which two disks are arranged on three axes as shown in FIG. If the disc diameter is less than 50 mm, the yarn to which the polymethyl methacrylate-based polymer and / or the polystyrene-based polymer is added,
Friction damage caused by the disc increases sharply, and yarn breakage and fluffing increase. If the disk diameter exceeds 70 mm, the twisting force of the disk is reduced, and sufficient crimping performance as a false twist yarn cannot be obtained. Further, the twisting tension increases, and the generation of fluff increases. Further, the operation (threading) of guiding the running yarn to the disk becomes extremely difficult.

Next, it is important that the running angle of the yarn passing through the disk be in the range of 38 to 48 degrees. Here, the running angle means an angle formed between the disk rotating shaft and the yarn running in contact with the outer periphery of the disk. The running angle of the yarn is 38 to 48 degrees, more preferably 40 to 45 degrees,
By setting the value within the range, the yarn feeding action can be enhanced without lowering the twisting force of the disk, and twisting and untwisting can be performed in a stable state. If the running angle is less than 38 degrees, the twisting force is high, but the yarn feeding force is weak, the yarn swaying due to the decrease in twisting tension becomes severe, and the occurrence of yarn breakage and fluff increases. In addition, the number of spots on the woven fabric caused by the fluctuation in twisting tension increases. When the running angle exceeds 48 degrees,
The twisting force decreases, and sufficient crimping performance as a false twist yarn cannot be obtained. In addition, generation of fluff increases with an increase in twisting tension.

Next, the number of false twists is calculated as (15000 to 3500
0) / (False twist fineness (dtex)) ^1/2Times / m, better
Preferably (2000-30000) / (false twisted yarn fineness
(Dtex))^1/2Times / m
You. The number of false twists is 15000 / (false twist fineness (dtex))
^1/2If the number of turns is less than / m, sufficient crimp as false twisted yarn
Performance cannot be obtained. The number of false twist is 35000 / (false twist fineness
(Dtex))^1/2If the number of turns / m is exceeded,
The generation of fluff increases.

By setting the drawing / false twisting operation and conditions as described above, an undrawn mixed fiber including a yarn in which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer is added and orientation crystals are suppressed is obtained. , 80
Stretching and false twisting at a speed of at least 0 m / min.
A high quality false twist mixed fiber yarn with less fluff can be manufactured.

[0019]

Next, the present invention will be described specifically with reference to examples. Each item in the examples was measured by the following method.

(A) Intrinsic Viscosity Using an orthochlorophenol as a solvent, the intrinsic viscosity was measured at a temperature of 35 ° C. using an Ubbelohde viscosity tube.

(B) Stretching and False Twisting Yarn The stretching and false twisting is continuously performed for one week with a 216-weight HTS-15V manufactured by Teijin Machinery Co., Ltd. Was drawn and false-twisted yarn. However, yarn breakage due to artificial or mechanical factors, such as yarn breakage before and after yarn joining (knot yarn breakage) or yarn breakage during automatic switching, was excluded from the number of times of yarn breakage.

(C) Fluff Using a DT-104 fluff counter device manufactured by Toray Industries, Inc., the false twist mixed fiber sample was continuously measured at a speed of 500 m / min for 20 minutes to measure the number of fluff generated. 10,000m long
It was represented by the number per hit.

(D) Crimp rate The false-twisted mixed yarn sample was 0.044 cN / (false twisted yarn fineness).
(Dtex)) and take up around a stencil frame, about 3
A 300 dtex case was made. At one end of the case,
0.00177 cN / dtex and 0.177 cN /
Two loads of dtex are applied and the length L after 1 minute has passed
₀(Cm) was measured. Then, 0.177 cN / dt
ex in the boiling water at 100 ° C.
Treated for 0 minutes. 0.00177 cN / dt after boiling water treatment
ex, remove the load and dry naturally for 24 hours
And again at 0.00177 cN / dtex and 0.17
Apply a load of 7 cN / dtex and measure the length after 1 minute
Is measured and L₁(Cm). Then, 0.177 cN
Remove the load of / dtex and measure the length after 1 minute
L _TwoAnd calculate the crimp rate by the following formula, and measure 10 times
The value was represented by the average value. Crimp rate (%) = [(L₁-L_Two) / L₀] X 100

(E) Dyeing The false-twisted mixed yarn was twisted at 600 times / m to obtain a twill woven fabric using warp and weft. Next, refining / relaxation treatment at 100 ° C, preset dry heat treatment at 180 ° C for 45 seconds, alkali reduction treatment of 15%, dyeing at 130 ° C for 30 minutes, natural drying, and final drying at 170 ° C for 45 seconds A set was made to create a woven fabric. An inspector visually determined the spots on the woven fabric and rated them based on the following criteria. Level 1: A uniform dyeing without any streaks or spots. Level 2: Streak-like and spot-like spots are slightly observed, but acceptable as a good product. Level 3: Many streaky or large spot-like dyed spots or nep-shaped fiber masses are observed.

Examples 1-3 and Comparative Examples 1-2 Polystyrene terephthalate chips having an intrinsic viscosity of 0.64 and containing 0.3% by weight of titanium oxide were mixed with 1 polystyrene having a molecular weight of 30,000 and a glass transition point of 103 ° C. The mixture added with 0.5% by weight and the polyethylene terephthalate single chip having an intrinsic viscosity of 0.64 and containing 0.3% by weight of titanium oxide are each dried at 160 ° C., and then supplied to the same spinning apparatus to be melted and discharged. did.

The mixture containing 1.5% by weight of polystyrene was discharged from a spinneret having 48 discharge holes having a hole diameter of 0.23 mm and a land length of 0.60 mm. On the other hand, the polyethylene terephthalate single chip has a hole diameter of 0.35 mm,
The liquid was discharged from a spinneret having 15 discharge holes having a land length of 0.8 mm. The yarn is cooled, applied with an oil agent, wound up as one package at a speed of 3200 m / min, and 303 dt.
An undrawn mixed yarn of ex.63 filament was obtained.

The unstretched mixed yarn is applied to a 216-weight HTS-15V made by Teijin Machinery Co., Ltd., and passed through an interlace nozzle having a compressed air blowout hole having a hole diameter of 1.8 mm, and the width of 60 n is passed.
The air was entangled at a flow rate of L / min, the stretching ratio was 1.60, the first heater temperature was 550 ° C. in the first half of 30 cm, and the second half of the first heater temperature was 350 ° C. Stretching and false twisting were performed under the condition of 800 m / min. At this time, the results of stretching and false twisting performed by changing the diameter of the urethane disk, the running angle of the yarn with respect to the rotation axis of the disk, and the number of false twists are shown in Table 1. In Comparative Example 2 using a disk having a diameter of 70 mm, the threading operation performed at the start of operation was extremely difficult.

[0028]

[Table 1]

Examples 4 to 6 and Comparative Examples 3 to 4 A polyethylene terephthalate chip having an intrinsic viscosity of 0.64 and containing 0.3% by weight of titanium oxide was mixed with polymethylmetha having a molecular weight of 25,000 and a glass transition point of 105 ° C. A mixture containing 2.0% by weight of acrylate and an intrinsic viscosity of 0.6
After drying the polyethylene terephthalate-only chips containing 0.3% by weight of titanium oxide at 160 ° C. at 160 ° C.,
It was supplied to the same spinning device and melted and discharged.

The mixture containing 2.0% by weight of polymethyl methacrylate had a pore diameter of 0.23 mm and a land length of 0.1%.
It was discharged from a spinneret having 48 60 mm discharge holes. On the other hand, the polyethylene terephthalate single chip was discharged from a spinneret having 15 discharge holes having a hole diameter of 0.35 mm and a land length of 0.8 mm. The yarn was cooled, an oil agent was applied, and the yarn was wound up as a single package at a speed of 3200 m / min to obtain an undrawn mixed yarn of 440 dtex and 63 filaments.

The unstretched mixed yarn is hung on a 216-weight HTS-15V made by Teijin Machinery Co., Ltd., and passed through an interlace nozzle having a compressed air blowout hole having a hole diameter of 1.8 mm to reach 60 n.
The air was entangled at a flow rate of L / min, and the draw ratio was 1.60. Stretching and false twisting were performed under the conditions of / min. At this time, the results of drawing and false twisting by changing the diameter of the urethane disk, the running angle of the yarn with respect to the rotation axis of the disk, and the number of false twists are shown in Table 2. In Comparative Example 4 using a disk having a diameter of 72 mm, the threading operation performed at the start of operation was extremely difficult.

[0032]

[Table 2]

Comparative Example 5 An undrawn mixed fiber was prepared under the same conditions as in Example 1 except that the interlace nozzle was not used, and drawing and false twisting were performed. The results shown in Table 3 were obtained.

[0034]

[Table 3]

[0035]

According to the present invention, it is possible to draw and false twist at a high speed an undrawn mixed fiber including a polyester yarn to which a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer has been added. Therefore, it is possible to stably produce a high quality false twist mixed fiber yarn.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a first embodiment of a stretching / false twisting step of the present invention.

FIG. 2 is a front view showing an example of a false twist disk unit used in the present invention.

[Explanation of symbols]

 1: undrawn blended yarn 2: yarn guide 3, 3 ': feed roller 4: interlace nozzle 5: first heater 6: cooling plate 7, 13: false twist disk 8: first delivery roller 9: second heater 10: Second delivery roller 11: Winding roller 12: Package (false twist mixed fiber) 14: Rotating shaft 15: Thread guide disk 16: Unit pedestal 17: Timing belt 18: Drive belt

Claims (1)

[Claims] 1. An undrawn blended yarn composed of a yarn obtained by adding a polymethyl methacrylate-based polymer and / or a polystyrene-based polymer to a polyester and a polyester single yarn, is subjected to the simultaneous simultaneous false twisting process as follows: (1) A method for producing a false twisted yarn characterized by simultaneously performing drawing and false twisting under conditions that simultaneously satisfy the conditions (1) to (4). (2) Twisting / untwisting is performed using a disk having a diameter of 50 to 70 mm. (3) The running angle of the yarn with respect to the rotation axis of the disk is 38
To 48 degrees. (4) The number of false twists is (15000 to 35000) / (false twist fineness (dtex)) ^1/2 times / m.