Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
  • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
  • D02G1/0213—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting after drawing the yarn on the same machine
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
  • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
  • D02G1/022—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting while simultaneously drawing the yarn
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
  • D02G3/04—Blended or other yarns or threads containing components made from different materials
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

• the present invention relates to a polyester conjugate fiber and a polyester false twisted textured yarn, as well as production methods therefor. More specifically, the invention stably provides a low-crystallinity, high-elongation partially oriented polyester conjugate fiber, and also relates to a polyester conjugate fiber false twisted textured yarn obtained by draw false-twist texturing using the above conjugate fiber, which has a small initial modulus and also has high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small, and also to production methods therefor.
• Polytrimethylene terephthalate (hereinafter sometimes referred to as "PTT"), which is obtained by the polycondensation of a lower alcohol ester of terephthalic acid such as terephthalic acid or dimethyl terephthalate with trimethylene glycol (1,3-propanediol), is an innovative polymer in that fibers made thereof have properties similar to those of polyamide, such as low modulus (soft texture), excellent elastic recovery, and dyeability, together with performance similar to that of polyethylene terephthalate (hereinafter sometimes referred to as "PET”) fibers, including light resistance, heat-setting properties, dimensional stability, and low water absorption. Taking advantage of these characteristics, such fibers have been applied to BCF carpets, brushes, tennis strings, and the like.
• JP2005-264424A (PTL 1) is known, which has high crimping performance. Meanwhile, because the crimping occurs through a boiling water treatment, the crimp-developing ability during woven fabric binding is low, or the crimp is easily weakened by external force. Therefore, it has been impossible to sufficiently develop the function as a stretch fiber.
• JP2003-301341A discloses that when a side-by-side type or eccentric sheath-core type conjugate fiber drawn yarn composed of two kinds of PTTs having different intrinsic viscosities is subjected to false-twist texturing and heat-setting, a false twisted textured yarn of a PTT conjugate fiber having excellent stretchability and high fabric quality can be obtained.
• heat-setting reduces the crimp, and this fiber does not have sufficient stretchability either.
• An object thereof is to provide a polyester conjugate fiber and a textured yarn, which have a small initial modulus and also have high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small, as well as production methods therefor.
• the present inventors have conducted extensive research to achieve the above object. As a result, they have found the above problems can be solved by subjecting a low-crystallinity, high-elongation partially oriented polyester conjugate fiber to draw false-twist texturing, and thus accomplished the invention.
• the invention provides:
• a low-crystallinity, high-elongation partially oriented polyester conjugate fiber can be stably provided, and, by performing draw false-twist texturing using the conjugate fiber, a polyester false twisted textured yarn having a small initial modulus and also having high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small, can be provided. Accordingly, a fiber structure having excellent stretchability can be obtained.
• FIG. 1 is a cross-sectional view illustrating examples of the cross-sectional shape of the conjugate fiber of the invention.
• polyethylene terephthalate polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid, and thermoplastic polyester elastomers
• the molecular weights thereof are changed, and a high molecular weight polymer is used as a first component, while a low molecular weight polymer is used as a second component, or alternatively, the first component is defined as a homopolymer, while the second component is defined as a copolymer, and they are used as polyester components having different intrinsic viscosities.
• a polymer containing 90 mol% or more of polytrimethylene terephthalate is preferably used as one of the components.
• a polytrimethylene terephthalate copolymer as shown below leads to an excellent balance between crimping characteristics and heat resistance and thus is still more preferable.
• a polytrimethylene terephthalate polymer is copolymerized with an acid component such as isophthalic acid, succinic acid, adipic acid, 2,6-naphthalenedicarboxylic acid, or 5-sulfoisophthalic acid tetrabutylphosphonium salt, a glycol component such as 1,4-butanediol, 1,6-hexanediol, or cyclohexanedimethanol, ⁇ -caprolactone, 4-hydroxybenzoic acid, polyoxyethylene glycol, polytetramethylene glycol, or the like within a range of less than 10 mass%.
• an acid component such as isophthalic acid, succinic acid, adipic acid, 2,6-naphthalenedicarboxylic acid, or 5-sulfoisophthalic acid tetrabutylphosphonium salt
• a glycol component such as 1,4-butanediol, 1,6-hexanedi
• the above polymers may have copolymerized or mixed therewith various additives such as delusterants, heat stabilizers, antifoaming agents, color-adjusting agents, flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, crystal nucleating agents, and fluorescent brighteners, for example.
• additives such as delusterants, heat stabilizers, antifoaming agents, color-adjusting agents, flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, crystal nucleating agents, and fluorescent brighteners, for example.
• the intrinsic viscosity [ ⁇ ] is 0.5 to 1.6, preferably 0.6 to 1.5. It is more preferably 0.7 to 1.4.
• the intrinsic viscosity is less than 0.5, because the molecular weight of the polymer is too low, strength development may be difficult, and conversely, in the case where the intrinsic viscosity is more than 1.6, because of the low flowability, the spinnability of low-viscosity polytrimethylene terephthalate may be impaired, causing breakage during spinning; therefore, this is undesirable.
• a polyester polymer used as the second component is preferably composed of a polyester-based polymer such as polyethylene terephthalate, polybutylene terephthalate, low-molecular-weight or copolymerized polytrimethylene terephthalate, or polytetramethylene terephthalate, or a copolymer thereof.
• additives such as antistatic agents, flame retardants, heat resistance agents, weather resistance agents, titanium oxide, and the like to these polymers or copolymers.
• polyester conjugate fiber of the invention it is necessary that the above first component and second component polymers are arranged such that they are bonded together in close contact with each other over the entire length of the fiber.
• the arrangement of the two components is not particularly limited, and various fiber cross-sections are possible, such as a side-by-side manner, a bonded manner, and an eccentric sheath-core manner as shown in FIG. 1 .
• the polyester conjugate fiber of the invention can be produced by a conventionally known composite spinning method, in which polyesters having different intrinsic viscosities are extruded from spinneret holes configured such that the polyesters are melt-discharged into the form of a conjugate fiber having the polyesters bonded together in a side-by-side manner, a bonded manner, or an eccentric sheath-core manner over the entire length of the fiber.
• the two kinds of polyesters may be extruded in an equal volume ratio, or the proportion of each component may be appropriately varied.
• the ratio between the two components to be composite-spun is favorably within a range of 30 to 70/70 to 30.
• the ratio is still more preferably 40 to 60/60 to 40.
• the polytrimethylene terephthalate component is 70% or more, crimpability improves, but the strength as a conjugate fiber may decrease. Meanwhile, in the case where the polytrimethylene terephthalate component is less than 30%, crimpability may be insufficient.
• the difference in melt viscosity between the first component and the second component is desirably 200 poise (measured at 290°C and a shear rate of 7,780 cm -1 ) or more and 3,000 poise or less.
• the difference is more preferably 250 to 2,500 poise, and still more preferably 300 to 2,000 poise.
• the viscosity difference is less than 200 poise, crimp development may not be observed, while when it is more than 3,000 poise, in the case where the two components with different melt viscosities are composite-spun immediately below the discharge holes, a kneeing phenomenon, in which the yarn bends toward the higher melt viscosity side immediately below the discharge holes, may occur, causing problems with operability.
• a method to prevent kneeing is to tailor the spinneret holes. For example, as shown in British Patent No. 965729 , a method in which the spinneret holes are previously bent in the direction opposite to the kneeing direction, and the polymer is discharged vertically from the spinneret face, is also effective in the production of the polyester conjugate fiber of the invention.
• the method for producing the polyester conjugate fiber will be described in further detail.
• the chips are dehumidified to a moisture content of to 0.01 mass% or less using a chip drying apparatus such as those known in the conventional polyester conjugate fiber production.
• the polymers that have been melted through a melt extruder such as an extruder or a silver plate melter, are discharged from a spinneret having a nozzle provided with the same number of holes as the target filament count, and, while being cooled and solidified by cooling air blown below the spinneret, taken up by a godet roller, and wound up on a bobbin using a winder.
• a melt extruder such as an extruder or a silver plate melter
• the fiber when obtaining a partially oriented yarn (POY) for making the below-described false twisted textured yarn, the fiber is wound up at a wind-up speed of 1,000 to 3,000 m/min on a first heating roller at the glass transition temperature - 30°C of, among the polyester components, the polyester component having a lower glass transition temperature (hereinafter sometimes referred to as Tg) to the glass transition temperature + 30°C of the polyester component having a higher glass transition temperature, further drawn to 1.0 to 3.0 times the original length while being heated by the first heating roller, wound around a second heating roller at 30 to 120°C, and then wound up at a speed of 2,000 to 3,300 m/min, whereby a partially oriented yarn of the polyester conjugate fiber can be obtained.
• Tg glass transition temperature
• the polyester conjugate fiber when the polyester conjugate fiber is wound up, in the case where winding up is performed at a speed higher than 3,000 m/min, the elongation becomes too low, and thus fluff or yarn breakage is likely to occur during spinning or false-twist texturing. In addition, also at the time of draw false-twist texturing, the crimp is reduced.
• the polyester conjugate fiber after drawing is wound around a second heating roller at 30°C or more and 120°C or less.
• the oriented crystallization does not proceed, and when the fiber is stored at around room temperature, the fiber becomes brittle, making it difficult to handle the fiber or perform draw false-twist texturing.
• the fiber is wound around a second heating roller having a temperature of higher than 120°C, the yarn elongates, and, due to yarn sway, yarn unevenness increases.
• the oriented crystallization of the obtained yarn is too high, and even when draw false-twist texturing is subsequently performed, the crimp does not increase.
• the polyester conjugate fiber that has passed through the heating roller after drawing is wound up.
• the wind-up speed at this time is less than 2,000 m/min
• the orientation of the fiber is low. Therefore, when the fiber is stored at around room temperature, the fiber becomes brittle, making it difficult to handle the fiber or perform draw false-twist texturing. Meanwhile, in the case where the wind-up speed exceeds 3300 m/min, the elongation becomes too low, and therefore, fluff or yarn breakage is likely to occur during spinning or false-twist texturing. In addition, also at the time of draw false-twist texturing, the crimp is reduced.
• the polyester conjugate fiber obtained by the above method is preferable in that its crystallization has moderately proceeded, and therefore, tight winding due to the strain relaxation of the polymer is unlikely to occur, and changes over time are also small.
• the ratio of crystallization heat quantity at elevated temperature of the polyester conjugate fiber measured by the below-described method is 10 to 60%, preferably 15% to 55%, relative to the completely amorphous state.
• the ratio of crystallization heat quantity at elevated temperature is more than 60% relative to the completely amorphous state, tight winding or the like occurs during winding up the conjugate fiber.
• the ratio of crystallization heat quantity at elevated temperature is less than 10%, the crystallinity becomes too high, and no crimp is developed even when draw false-twist texturing is performed.
• the elongation at break of the polyester conjugate fiber is 60 to 200%.
• the elongation at break is less than 60%, the elongation is too low, and thus fluff or yarn breakage is likely to occur during spinning or false-twist texturing.
• the degree of orientation of the fiber is too low. Accordingly, the fiber is susceptible to changes over time, and becomes extremely brittle even when stored at room temperature. As a result, it becomes impossible to stably obtain false twisted textured yarns of consistent quality on an industrial scale.
• the elongation at break is preferably within a range of 70 to 180%, and more preferably within a range of 75 to 150%.
• the silk factor (strength ⁇ ⁇ elongation), which indicates the toughness of a yarn, of the polyester conjugate fiber is 10 or more. It is preferable that the silk factor is still more preferably 13 or more, and yet more preferably 15 or more. In the case where the silk factor is less than 10, yarn breakage occurs during drawing and false-twisting.
• the peak temperature of the thermal stress of the polyester conjugate fiber is equal to or lower than the Tg + 50°C of the polyester component having a higher glass transition temperature (Tg) among the polyester components constituting the conjugate fiber.
• Tg glass transition temperature
• the peak value of the thermal stress is 0.05 and 0.8 cN/dtex.
• the peak value of the thermal stress is still more preferably 0.06 to 0.7 cN/dtex, and the peak value of the thermal stress is most preferably 0.07 to 0.6 cN/dtex.
• the peak value of the thermal stress is less than 0.05 cN/dtex, the tension during false-twist texturing decreases, and the crimp is reduced.
• the peak value of the thermal stress is more than 0.8 cN/dtex, the tension during false-twist texturing becomes too high, causing yarn breakage or loss of softness.
• a false twisted textured yarn made of the polyester conjugate fiber of the invention which has a small initial modulus and also has high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small, can be obtained by subjecting a partially oriented yarn of the polyester conjugate fiber to draw false-twist texturing.
• the intended polyester false twisted textured yarn can be obtained.
• the polyester false twisted textured yarn obtained by the above method is a false twisted textured yarn having high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small. Therefore, in the case where this yarn is used to make a fabric, the resulting fabric is soft and highly elastic, and the fabric exhibits moderate stretch.
• the fabric can be dyed using usual polyester disperse dyes.
• a fabric using the polyester conjugate fiber or polyester false twisted textured yarn of the invention eliminates the feeling of tightness when bending the elbows or knees or stretching the arms, allowing for use as a core yarn for clothing materials with high wearing comfort. Therefore, extreme usefulness is provided for outerwear, linings, sports, and like applications.
• the total fineness of the polyester false twisted textured yarn obtained by the above method is preferably 10 to 200 dtex, and the tensile breaking strength is preferably 2.0 cN/dtex or more.
• Modulus at 2% elongation is 10 cN/dtex or less
• the modulus of the polyester false twisted textured yarn at 2% elongation is 10 cN/dtex or less.
• a lower value of the modulus at 2% elongation indicates that higher crimp has occurred even before a boiling water treatment, and higher stretchability can be obtained.
• the modulus at 2% elongation is more preferably 8 cN/dtex or less. In the case where the modulus at 2% elongation is more than 10 cN/dtex, the occurrence of crimp before a boiling water treatment is small, and stretchability cannot be obtained.
• Vc apparent crimp degree
• a polyester false twisted textured yarn was wound up on a skein frame under a tension of 0.044 cN/dtex to prepare a skein having a thickness of about 3,300 dtex.
• a load of 0.00177 cN/dtex alone was applied to one end of the skein, and the length S1 (cm) after an elapse of 1 minute was measured.
• Vc was calculated by the following formula, and the average of 10 measured values was calculated.
• Vc S 0 ⁇ S 1 / S 0 ⁇ 100
• Vc is less than 10%
• stretchability cannot be obtained.
• a Vc exceeding 50% leads to increased expansion and contraction, making handling difficult.
• the latent crimp degree (hereinafter abbreviated as Tc) of the polyester false twisted textured yarn measured by the following method is 30% ⁇ Tc ⁇ 70% (30 to 70%).
• a polyester false twisted textured yarn sample was wound up on a skein frame under a tension of 0.044 cN/dtex to prepare a skein having a thickness of about 3,300 dtex.
• the load of 0.177 cN/dtex was removed from the skein, and, in this state, the skein was treated in boiling water at 100°C for 20 minutes. After the boiling water treatment, the load of 0.00177 cN/dtex was removed from the skein, followed by natural drying in a free state under no load for 24 hours.
• Tc is less than 30%
• the crimp is weakened by the boiling water treatment, and stretchability cannot be obtained.
• a Tc exceeding 70% leads to increased expansion and contraction, making handling difficult.
• Vc and Tc of the polyester false twisted textured yarn have the relationship of the following calculation formula. ⁇ 20 % ⁇ Vc ⁇ Tc ⁇ 20 %
• the fiber structure there is a woven or knitted fabric in which the above polyester conjugate fiber and a polyethylene terephthalate high-multifilament yarn having a single filament of 1 dtex or less are commingled, and then the commingled yarn is false-twist textured and thus formed into a yarn having high stretchability.
• the temperature was raised from room temperature to 350°C at a temperature rise rate of 10°C/min to completely melt each of the fiber raw material resins, followed by rapid cooling, and the temperature was further raised to 300°C at a rate of 10°C/min. From the temperature rise curve obtained at this time, the glass transition temperature (Tg) was measured.
• DSC differential scanning calorimeter
• the fineness of a polyester conjugate fiber and that of a polyester false twisted textured yarn were measured in accordance with JIS-L-1013. In addition, the value was divided by the number of single yarns to determine the single yarn fineness.
• DSC differential scanning calorimeter
• the temperature was raised to the melting point + 50°C of the resin constituting the fiber to completely melt the fiber, followed by rapid cooling with water, creating a completely amorphous state.
• a polyester false twisted textured yarn was wound up on a skein frame under a tension of 0.044 cN/dtex to prepare a skein having a thickness of about 3,300 dtex.
• a load of 0.00177 cN/dtex alone was applied to one end of the skein, and the length S1 (cm) after an elapse of 1 minute was measured.
• Vc was calculated by the following calculation formula, and the average of 10 measured values was calculated.
• Vc S 0 ⁇ S 1 / S 0 ⁇ 100
• a polyester false twisted textured yarn was wound up on a skein frame under a tension of 0.044 cN/dtex to prepare a skein having a thickness of about 3,300 dtex.
• the load of 0.177 cN/dtex was removed from the skein, and, in this state, the skein was treated in boiling water at 100°C for 20 minutes. After the boiling water treatment, the load of 0.00177 cN/dtex was removed from the skein, followed by natural drying in a free state under no load for 24 hours.
• Dimethyl terephthalate and 1,3-propanediol were charged in a molar ratio of 1:2, then titanium tetrabutoxide equivalent to 0.1 wt% of dimethyl terephthalate was added, and a transesterification reaction was completed at a heater temperature of 240°C under normal pressure.
• titanium tetrabutoxide was further added in 0.1 wt% of the theoretical polymer amount, and titanium dioxide was added in 0.5 wt% of the theoretical polymer amount, followed by a reaction at 270°C for 3 hours.
• the obtained polytrimethylene terephthalate had an intrinsic viscosity of 1.0 dl/g.
• the glass transition temperature of this polymer was 45°C.
• this polymer was subjected to solid-phase polymerization at 180°C under nitrogen for 45 hours to obtain polytrimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g.
• the glass transition temperature of this polymer was 46°C.
• polytrimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and polytrimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g obtained above they were each dried in a hot air dryer at 150°C for 6 hours to a moisture content of 50 ppm, then each melted at 265°C, and, using a spinneret having a side-by-side type cross-section, each extruded from a spinneret heated at 265°C in a mass ratio of 50:50 through discharge holes arranged in a single row provided with 24 0.3-mm-diameter discharge holes at a discharge rate of 14 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 mass% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the obtained solid multifilament was wound around a first heating roller heated to 50°C and having a peripheral speed of 2,200 m/min, then wound around a second heating roller at 80°C so as to be drawn to 1.2 times the original length, and subsequently wound up at a wind-up speed of 2,550 m/min (overfeed rate: 4%) using a wind-up machine configured to drive both the spindle and the touch roll, thereby giving a cheese package wound with a 56 dtex/24 f polyester conjugate fiber.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• polytrimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and polyethylene terephthalate having an intrinsic viscosity of 0.6 dl/g and a glass transition temperature of 75°C were melted at 265°C and 285°C, respectively, and each extruded from a spinneret heated at 285°C in a ratio of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 19 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 wt% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the fiber was then wound around a first heating roller heated to 50°C and having a peripheral speed of 1,300 m/min, drawn to 2.0 times the original length, wound around a second heating roller at 80°C, and subsequently wound up at a wind-up speed of 2,550 m/min (overfeed rate: 3%) using a wind-up machine configured to drive both the spindle and the touch roll, thereby giving a cheese package wound with a 75 dtex/24 f polyester conjugate fiber.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• the fiber yarn physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• polyester conjugate fiber was subjected to draw false-twist texturing under the same conditions as in Example 1 except that the draw ratio was 1.6, thereby giving a polyester false twisted textured yarn.
• the physical properties of the obtained polyester false twisted textured yarn are shown in Table 2.
• trimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and trimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g and a glass transition temperature of 46°C used in Example 1 were each separately melted, discharged in a composite ratio (mass%) of 50:50 from a 24-hole composite spinneret at a spinning temperature of 265°C, and then once wound up using a wind-up machine at a spinning speed of 1,400 m/min, thereby giving an undrawn yarn of a side-by-side type polyester conjugate fiber having 185 dtex/24 filaments.
• the polyester conjugate fiber undrawn yarn was drawn at a hot roller temperature of 75°C, a hot plate temperature of 170°C, and a draw ratio of 2.2, and then, without being once taken up, continuously relax-treated to 0.9 times the original length and wound up, thereby giving a drawn yarn of a polyester conjugate fiber having 85 dtex/24 filaments.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• the obtained polyester conjugate fiber drawn yarn was false-twist textured under the following conditions.
• the physical properties of the obtained polyester false twisted textured yarn are shown in Table 2.
• trimethylene terephthalate having an intrinsic viscosity of 1.40 dl/g and a glass transition temperature of 45°C and polyethylene terephthalate having an intrinsic viscosity of 0.60 dl/g and a glass transition temperature of 75°C used in Example 2 were each separately melted, discharged in a composite ratio (mass%) of 50:50 from a 24-hole composite spinneret at a spinning temperature of 275°C, and then once wound up using a wind-up machine at a spinning speed of 1,400 m/min, thereby giving an undrawn yarn of a side-by-side type polyester conjugate fiber having 185 dtex/24 filaments.
• the polyester conjugate fiber undrawn yarn was drawn at a hot roller temperature of 75°C, a hot plate temperature of 170°C, and a draw ratio of 3.3, and then, without being once taken up, continuously relax-treated to 0.9 times the original length and wound up, thereby giving a drawn yarn of a polyester conjugate fiber having 56 dtex/24 filaments.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• the obtained polyester conjugate fiber drawn yarn was false-twist textured under the same conditions as in Comparative Example 1.
• the physical properties of the obtained polyester false twisted textured yarn are shown in Table 2.
• Trimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and trimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g and a glass transition temperature of 46°C were each separately melted, and, at a spinning temperature of 265°C, extruded from a 24-hole composite spinneret in a composite ratio (mass%) of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 20 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 wt% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the obtained solid multifilament was wound around a first heating roller heated to 55°C and having a peripheral speed of 2,200 m/min, then wound around a second heating roller at 140°C so as to be drawn to 1.7 times the original length, and subsequently wound up at a wind-up speed of 3,510 m/min (overfeed rate: 6%) using a wind-up machine configured to drive both the spindle and the touch roll.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• the obtained polyester conjugate fiber drawn yarn was false-twist textured at a draw ratio of 1.05 under the following conditions.
• the physical properties of the obtained polyester false twisted textured yarn are shown in Table 2.
• Type of false-twisting machine LS-2 manufactured by Mitsubishi Heavy Industries, Ltd. (pin false-twisting method)
• Example 2 In the same manner as in Example 2, using trimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and polyethylene terephthalate having an intrinsic viscosity of 0.60 dl/g and a glass transition temperature of 75°C, they were melted at 265°C and 285°C, respectively, and each extruded from a spinneret heated at 285°C in a ratio of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 19 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 wt% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the obtained solid multifilament was wound around a first heating roller heated at 55°C and having a speed of 1,400 m/min, then wound around a heated second heating roller at 170°C so as to be drawn to 2.6 times the original length, and subsequently wound up at a wind-up speed of 3,430 m/min (overfeed rate: 6%) using a wind-up machine configured to drive both the spindle and the touch roll.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• polytrimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and polytrimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g and a glass transition temperature of 46°C were each separately melted, each melted at 265°C, and, using a spinneret having a side-by-side cross-section, each extruded from a spinneret heated at 265°C in a ratio of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 19 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 wt% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the obtained solid multifilament was wound around a first heating roller heated to 50°C and having a peripheral speed of 3,200 m/min, then wound around a second heating roller at 80°C so as to be drawn to 1.1 times the original length, and subsequently wound up at a wind-up speed of 3,360 m/min (overfeed rate: 6%) using a wind-up machine configured to drive both the spindle and the touch roll.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• the obtained polyester conjugate fiber was subjected to draw false-twist texturing under the following conditions at a draw ratio of 1.1.
• the physical properties of the obtained polyester false twisted textured yarn are shown in Table 2. The amount of crimp in the obtained textured yarn was small.
• polytrimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and polytrimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g and a glass transition temperature of 46°C were each separately melted, each melted at 265°C, and, using a spinneret having a side-by-side cross-section, each extruded from a spinneret heated at 265°C in a ratio of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 15 g/min (total discharge amount).
• the obtained solid multifilament was wound around a non-heated first heating roller having a speed of 1,000 m/min, and then wound up at a speed of 1,000 m/min using a wind-up machine configured to drive both the spindle and the touch roll.
• the physical properties of the obtained polyester conjugate fiber are shown in Table 1.
• polytrimethylene terephthalate having an intrinsic viscosity of 1.0 dl/g and a glass transition temperature of 45°C and polytrimethylene terephthalate having an intrinsic viscosity of 1.4 dl/g and a glass transition temperature of 46°C were each separately melted, each melted at 265°C, and, using a spinneret having a side-by-side cross-section, each extruded from a spinneret heated at 265°C in a ratio of 50:50 through a spinneret provided with 24 0.3-mm-diameter holes arranged in a single row at a discharge rate of 19 g/min (total discharge amount).
• the extruded molten multifilament was rapidly cooled by exposure to wind at a wind velocity of 2.0 m/min and thus converted into a solid multifilament. Subsequently, using a guide nozzle, an oil agent containing 60 wt% of octyl stearate, 15 wt% of a polyoxyethylene alkyl ether, and 3 wt% of potassium phosphate prepared as a water emulsion finishing agent with a concentration of 10 wt% was attached such that the amount of oil agent attached was 0.6 wt% relative to the fiber.
• the obtained solid multifilament was wound around a non-heated first heating roller having a speed of 2,600 m/min, then wound around a second heating roller having a speed of 2,600 m/min, and subsequently wound up at a wind-up speed of 2,600 m/min using a wind-up machine configured to drive both the spindle and the touch roll.
• the obtained polyester conjugate fiber significantly deteriorated over time, and the winding state was poor, causing tight winding during winding up. Thus, it was not possible to stably collect yarn samples.
• the physical properties of the obtained polyester conjugate fiber, which was collected only in a small quantity, are shown in Table 1.
• a polyester conjugate fiber false twisted textured yarn having a small initial modulus and also having high crimping performance even before a boiling water treatment, in which the difference in crimping characteristics before and after the boiling water treatment is small can be provided.
• a fabric having high crimping performance and thus having stretchability, which also has no difference crimping characteristics before and after a boiling water treatment, is resistant to yarn shrinkage even in subsequent steps such as dyeing, and has a soft texture, can be obtained.

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