JP2005097804A - Method for producing thick and thin yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a polyester thick and thin yarn suitable for obtaining a cloth having a natural spot feeling and grain feeling and also an excellent soft, spun tone and bulged feeling on preparing the cloth, economically at a low cost and stably by using a direct spinning and stretching method. <P>SOLUTION: This method for producing the thick and thin yarn is characterized by melt-ejecting a polyester containing ≥90 mol% ethylene terephthalate, then without imparting preliminary entwinement, imparting an oil agent while revolving the yarn, taking-in the yarn with a non-heated roller for controlling tension (PTR), then introducing into a heated first godet roller (GR1) by setting 1.02-1.05 peripheral speed ratio of the GR1 to PTR and performing stretching and heat-setting with the heat-setting second godet roller (GR2) so as to make 42-55% elongation at break. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a polyester chic and thin yarn that has a natural patchy feeling and wrinkle feeling and can have a soft and spanned texture. More specifically, the present invention relates to a method for producing polyester chic and thin yarn by a direct spinning drawing method that is economically advantageous, excellent in operability, and capable of being stably supplied.

  Conventionally, a polyester thick and thin yarn having thick spots in the fiber axis direction obtained by stretching an undrawn polyester yarn at a glass transition temperature or lower at a low draw ratio has been known. The thick and thin yarn had to be subjected to an aging treatment for a certain period of time in an undrawn yarn state in order to produce a natural texture and texture. In this case, since the appearance state of the chic part and the thin part depends on atmospheric conditions such as aging time and temperature / humidity, even if a high-quality yarn is obtained, production efficiency is poor and economically disadvantageous.

  In order to solve such a problem, a method of producing by a so-called direct spinning drawing method with high economic efficiency has been proposed. For example, Patent Document 1 discloses a direct spinning / stretching method in which an oil agent is applied after melt extrusion cooling, and then a tangling is applied by a fluid injection nozzle immediately before being introduced into a first goded roller, followed by stretching.

Japanese Patent Publication No. 61-6164

  However, in the yarn obtained by this method, the repetition cycle of the chic part and the thin part becomes large, and the contrast between the chic part and the thin part becomes too strong. There was a problem that the quality deteriorated, for example, a hole was formed by pulling due to the shrinkage.

  Further, Patent Document 2 proposes a method in which a first goded roller is taken as a POY yarn and stretched with a non-heated mirror surface. Further, Patent Document 3 proposes a method in which melt-extrusion, rapid cooling, and heating are performed with a heating cylinder and then taken up at a high speed. However, in these methods, the operability is inferior due to high-speed production, and the quality of the fabric is poor as in Patent Document 1.

JP-A 61-275419 JP-A-8-209441

  On the other hand, Patent Document 4 proposes a direct spinning and stretching method with natural spots by installing a hot plate between the first goded roller and the second goded roller and starting drawing on the hot plate. However, in this case, it is possible to obtain a natural sensation, but since the high-speed yarn contacts the hot plate, there are many problems in the manufacturing process, such as frequent occurrence of fluff due to friction when the production time is prolonged.

JP-A-9-209228

  As a method capable of stable production, as in Patent Document 5, fluid entanglement treatment is performed on the yarn before applying the oil agent, and after applying the excess oil agent to promote the adhesion spot of the oil agent, at a high draw ratio. A method of stretching is disclosed.

JP 63-182412 A

  According to this method, stable production is possible, but according to the examples, the residual elongation is as low as 30 to 40%, and a hard texture equivalent to that of a full draw yarn is obtained, and a yarn with a soft texture cannot be obtained.

  The inventors of the present invention have solved the problems of the prior art, and have a polyester chic suitable for obtaining a soft, spanned and swelled sensation that has a natural mottled and sensation when used as a fabric. An object of the present invention is to provide a production method by a direct spinning drawing method that stably and economically produces an andsin yarn.

  In the present invention, a polyester containing 90% by mole or more of ethylene terephthalate is melted and discharged, cooled, and without applying pre-entanglement, after applying an oil agent while turning the yarn, a non-heating roller for tension control ( PTR), and then introduced to GR1 with the peripheral speed ratio of the heated first godged roller (GR1) and PTR set to 1.02 to 1.05, and then between the second godged roller (GR2) for heat setting The gist of the present invention is to perform a stretching heat setting with a breaking elongation of 42 to 55%. In particular, when the second goded roller is a tapered roller having a taper ratio of 2 to 4%, more stable productivity can be obtained, and economic efficiency is improved.

Even if it is a cheese-like package by the direct spinning drawing method of the present invention, when a fabric is formed and dyeing is performed, the contrast is not too strong, and natural spots and tone are produced, and a soft and swollen span tone. Chic and thin yarn. Further, since it is a direct spinning drawing method, it can be produced economically at low cost, and it becomes possible to provide thick and thin yarn of stable quality.

  The present invention is described in detail below. The thick and thin yarn of the present invention is composed of a polyester fiber containing 90 mol% or more of ethylene terephthalate, and if necessary, an acid component such as sodium 5-sulfoisophthalate, adipic acid, sebacic acid, isophthalic acid, Copolymerized diol components such as diethylene glycol, triethylene glycol, polyethylene glycol, and cyclohexanedimethanol are employed. Moreover, you may contain inorganic particles, such as titanium dioxide and a zinc oxide, another stabilizer.

  In order to melt and extrude the polyester, a normal method can be adopted. In order to provide functions such as texture and water absorption of the resulting thick and thin yarn, a U-shaped cross section, a triangular cross section, a Y-shaped cross section, and a W type The cross section of a fiber can be made into an atypical cross section using a die that forms a cross section, a flat cross section, or the like.

  Hereinafter, the direct spinning drawing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is an example of a direct spinning drawing apparatus used in the present invention. The yarn discharged from the spinneret 1 is cooled by a cooling device 2 and taken up by a tension control pre-tension roller (PTR) 5 via a turning nozzle 3 and an oil application device 4 which are turning devices. At this time, in the present invention, the arrangement of the swivel nozzle 3 and the oil application device 4 may be interchanged. Cold drawing is performed between the PTR and the first goded roller (GR1) 6, and the yarn is heated near the glass transition point in GR1. The temperature of GR1 may be between the glass transition temperature −10 and the glass transition temperature +10. The yarn preheated by GR1 is stretched between GR1 and the second goded roller (GR2) 7 so as to have the breaking elongation of the present invention, and is heat set. Thereafter, if necessary, the fluid entanglement device 8 performs the entanglement process and winds up.

  A first feature of the method for producing a thick and thin yarn by the direct spinning drawing method of the present invention is that a swirl nozzle that swirls the yarn without imparting entanglement is installed upstream or downstream in the vicinity of the oil application device. As shown in FIG. 3 or FIG. 4, it is necessary to create a state in which the oil agent is adhered while the yarn is swung on the oil agent applying device.

  The swivel nozzle used may be a commercially available nozzle for migrating the oil. In this case, in order to make the migration of the oil uniform, the flow of the yarn is varied within the nozzle as shown in FIG. Disturbance occurs and confounding of about 5 co / m is given. If the entanglement is even 1 m / m, the contrast between the chic part and the thin part becomes strong, and the fabric is inferior in quality. Therefore, for example, if a swiveling nozzle for the purpose of torque-free during false twisting is adopted, the number of entanglements becomes 0 co / m just by turning the yarn as shown in FIGS. The thick and thin contrast material derived from is not expressed, and the oil agent is applied while turning, so that natural stretch spots are formed due to the oil agent adhesion spots between the single yarns. The position of the swivel nozzle may be upstream or downstream of the oil agent applying device, and it is necessary that the oil agent be applied while the yarn is swiveling on the oil agent applying device.

  The adhesion amount of the oil agent is not particularly limited, but the oil agent adhesion rate may be set to 0.8 to 1.2% in order to impart the oil agent while turning and promote adhesion spots.

  In addition, the position to which the oil agent is applied is not particularly limited, but it is possible to stably produce better thick and thin yarn by immediately before the temperature of the fiber extruded from the spinneret 1 is lowered to the glass transition temperature. Can do.

  Then, after application of the oil agent, it is taken up by a non-heating roller for tension control (PTR) 5 in FIG. 1, a yarn is wound around the PTR, and cold drawing is performed between the heated first goded roller (GR1) 6. In addition, by applying tension between PTR and GR1, the twist of the yarn due to turning can be unwound, and a more natural spotted thick and thin yarn can be obtained. When PTR is not used, the contrast of the thick and thin yarn becomes somewhat strong, and the productivity is deteriorated because the twist caused by the swivel nozzle remains.

  The second feature of the present invention is that the peripheral speed ratio between GR1 and PTR is 1.02 to 1.05. If it is this range, productivity will be good, there will be no generation | occurrence | production of a fluff thread, and the quality of a cloth will become good.

  The third feature of the present invention is that the breaking elongation of the thick and thin yarn needs to be 42 to 55%. If the elongation at break is less than 42%, the appearance of the chic and thin has a natural feeling of sensation and the operability in production is improved, but there is a problem that the texture of the fabric becomes hard. When the elongation at break exceeds 55%, the stretching tension becomes low, so that the yarn sways greatly on the second goded roller (GR2) for heat setting, and the production of fibers such as 4-8 split fibers is likely to be produced. In this case, there is a problem that the yarns overlap each other and the yarn breaks frequently.

As the second godged roller (GR2) for heat setting, it is preferable to employ a taper roller having a taper ratio of 2 to 4% as shown in FIG. Here, the taper rate is calculated by the following formula from the roller length L, the root diameter H1, and the maximum diameter H2 shown in FIG.
Taper rate (%) = (H2−H1) / L × 100
In order to obtain a soft and spanned fabric, which is one of the objects of the present invention, it is necessary to achieve the breaking elongation described above, and in this case, the yarn sway on GR2 tends to increase. A taper ratio of 2 to 4% is preferable because there is little yarn swinging and more stable production is possible, and there is no occurrence of yarn breakage.

  Hereinafter, the present invention will be described in more detail by way of examples. The characteristic values in the following examples are measured by the following method.

(1) Intrinsic viscosity The intrinsic viscosity [η] was measured by a conventional method at 20 ° C. in a mixed solvent of phenol / tetrachloroethane = 6/4.

(2) Hot water shrinkage (BWS)
A yarn having a sample length of 500 mm multiplied by a load of 2 mg / dtex is immersed in boiling water for 15 minutes and then air-dried.
BWS (%) = (initial sample length−sample length after shrinkage) / initial sample length × 100

(3) Number of yarn entanglement before drawing The yarn is wound around the tension control roller (PTR) 5 in FIG. 1, a pin is passed between the single yarns of the collected yarn 1m, and the point where the catch occurs is 1m. We measured how many confounding points there are.

(4) Breaking strength, breaking elongation It measured according to JIS-L1015.

(5) U%
Using USTER TESTER 4-CX (manufactured by Zellwegar), the measurement was performed by a usual method at a measurement speed of 50 m / min.

(6) Thick and Thin Appearance and Texture Using a stretched polyester yarn of 84 dtex / 36f as the warp, the thick and thin yarn produced in the example of the present invention was twisted at 1200 T / M and driven into the weft 15% After the alkali weight reduction treatment, the fabric obtained by dyeing was evaluated by a veteran engineer of fabric texture.

(Examples 1-2, Comparative Examples 1-2)
A polyethylene terephthalate having an intrinsic viscosity [η] = 0.638 and a TiO ₂ content of 1.4 wt% is discharged from a spinneret having a U-shaped cross section at a spinning temperature of 293 ° C., and at a wind speed of 0.4 m / sec. Cooled down. Thereafter, in Example 1, the oil agent was applied while passing through the swirling nozzle through the oil agent applying device (O / N) and swirling the yarn. In Example 2, the positions of the O / N and the swivel nozzle were reversed. In Comparative Examples 1 and 2, the swivel nozzle used in Examples 1 and 2 was changed to a commercially available migration nozzle (M / N). Then, it is taken up at 1504 m / min with a non-heated tension control pretension roller (PTR), wound around 1.5 times, and heated to 70 ° C. with a first godged roller (GR1) at a peripheral speed of 1580 m / min. Between the GR1 and the second goded roller (GR2) with a peripheral speed of 3500 m / min heated to 110 ° C. and subjected to air entanglement to 200 Utex of 200 dtex / 96 f. The cross-section thick and thin yarn was wound up. Each physical property and performance are shown in Table 1.

(Examples 3-6, Comparative Examples 3-7)
The thick and thin yarn was wound up in the same manner as in Example 1 except that PTR, GR1 / PTR peripheral speed ratio, GR1 peripheral speed, GR2 peripheral speed, and GR2 taper ratio were the conditions described in Table 3. In Comparative Examples 3 and 4, the elongation at break was out of the scope of the present invention, and the expression state of thick and thin was not satisfactory. In Comparative Examples 5 to 7, the peripheral speed ratio of GR1 / PTR is out, Comparative Examples 5 and 6 are thick and thin with high contrast, and in Comparative Example 7, the yarn breaks between PTR and GR1, and materials can be collected. There wasn't. In Example 5, although the expression of thick and thin was good, yarn breakage sometimes occurred due to yarn swinging on GR2. In Example 6, the expression of thick and thin was good, but the tension on GR2 was too high, and thread breakage could occur.

It is a schematic diagram of an example of a direct spinning drawing apparatus suitable for manufacturing the thick and thin yarn of the present invention. It is the schematic diagram showing the state of the thread | yarn at the time of using the migration nozzle which deviates from the range of this application and a fluid entanglement produces at the time of oil agent provision. In this invention, it is the schematic diagram showing the state of the thread | yarn in the case of providing an oil agent, while a thread | yarn turns. In this invention, it is the schematic diagram showing the state of the thread | yarn in the case of providing an oil agent, while a thread | yarn turns. It is a schematic diagram of the taper roller used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinneret 2 Cooling device 3 Revolving nozzle 4 Oil supply device 5 Pretension roller (PTR)
6 First Godled Roller (GR1)
7 Second Godled Roller (GR2)
8 Interlace nozzle 9 Migration nozzle 11 GR2 roller shell L Roller length H1 Roller root diameter H2 Roller maximum diameter

Claims (5)

After melting and discharging a polyester containing 90% by mole or more of ethylene terephthalate, cooling, applying an oil agent while turning the yarn without applying preliminary entanglement, and then using a non-heating roller for tension control (PTR) Then, the peripheral speed ratio between the heated first goded roller (GR1) and the PTR is introduced to GR1 as 1.02 to 1.05, and then the breaking elongation is between the second godged roller (GR2) for heat setting. A method for producing a thick and thin yarn, characterized by performing a drawing heat setting of 42 to 55%. The method for producing a thick and thin yarn according to claim 1, wherein the second goded roller (GR2) is a tapered roller having a taper ratio of 2 to 4%. The method for producing a thick and thin yarn according to claim 1, wherein a turning device for turning the yarn is installed downstream of the oil applying device. The method for producing a thick and thin yarn according to claim 1, wherein a turning device for turning the yarn is installed upstream of the oil applying device. The method for producing a thick and thin yarn according to claim 1, wherein the cross section of the thick and thin yarn is an irregular cross section.

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