JP5141415B2 - Polyester crimped multifilament and method for producing the same - Google Patents

Description

  The present invention relates to a polyester composite fiber suitable for woven and knitted fabrics, and more particularly to a polytrimethylene terephthalate-based single fiber fineness polyester composite fiber and a method for producing the same.

  In recent years, a stretch woven or knitted fabric imparted with a stretch performance among woven and knitted fabrics has been strongly demanded from its wearing feeling. In order to satisfy such a demand, for example, a large number of woven or knitted fabrics imparted with stretch properties by mixing polyurethane fibers with polyester fibers or the like are used. However, polyurethane fibers are difficult to be dyed by disperse dyes used for polyester fibers, so that there are problems such as a complicated dyeing process and embrittlement due to long-term use, resulting in reduced performance. In addition, particularly when the polyurethane fiber is developed in a swimsuit knitted fabric, the polyurethane fiber becomes brittle due to chlorine contained in water, and a sufficient function cannot be imparted. In order to avoid such drawbacks, application of polyester fiber crimped yarn instead of polyurethane fiber has been studied.

  Among them, polytrimethylene terephthalate (hereinafter sometimes referred to as PTT) fiber has a low Young's modulus and has a soft texture when used for garments such as knitted fabrics. Is expanding greatly. In particular, a number of latent crimped composite fibers have been proposed in which two types of polymers are bonded side-by-side or eccentrically to develop crimps after heat treatment. Among them, the single fiber fineness is 1.5 dtex or less. It is known that the PTT single fiber fine fineness composite fiber has an excellent soft feeling.

  However, these PTT single fiber fine fineness composite fibers have hitherto been problematic in that the generation of fluff and sagging cannot be suppressed, and the development for woven and knitted fabrics is restricted.

  According to the study by the present inventors, it is extremely difficult to achieve both the generation of fluff and sagging and the uniformity of stretching for the following reasons as a problem in the production of the PTT single fiber fineness composite fiber. It became clear that. That is, since the single fiber fineness fiber has a large fiber surface area, it cannot avoid fusing PTT components under conventional production conditions in preheating before drawing, and fluff and tarmi are generated. Under such stretching conditions that avoid fusion, uniform stretching is not achieved.

  Conventionally, a side-by-side type and an eccentric core-sheath type PTT single fiber fine fiber composite fiber using PTT for at least one component or PTT having different intrinsic viscosities for both components and a method for producing the same have been proposed (patent) Reference 1 to 3). However, in this proposal, since the preheating temperature before drawing is as high as 50 ° C. or higher, and the fiber treatment agent is not designed to form sufficient oil film strength, Fusion of PTT components cannot be avoided, and generation of fluff and tarmi cannot be suppressed.

  Further, in side-by-side type and eccentric core-sheath type PTT type composite fibers using PTT as one component of the composite fiber and polyethylene terephthalate (hereinafter sometimes referred to as PET) as the other component, it is contained in the fiber. A method has been proposed in which the metal metal catalyst around the spinneret is suppressed by removing the polymer metal catalyst, thereby improving the fluff and obtaining a stable spinning property (see Patent Document 4). Separately, in a side-by-side polyester composite fiber composed of two types of polymers with different viscosities, the high-viscosity component is made of PTT, and it is entangled at multiple stages of spinning to provide operational stability and high-order processing. A method for improving the performance has been proposed (see Patent Document 5). However, none of these methods is a technology that is conscious of avoiding the fusion of PTT components during stretching preheating, and therefore, in the single fiber fineness composite fiber, it is not possible to suppress the occurrence of fuzz and tarmi in the stretching preheating stage. .

Therefore, there has been a strong demand for a method for producing single-fiber fine fibers with improved generation of fluff and tarmi and no drawing failure, and the appearance of single-fiber fine fibers obtained thereby.
International Publication WO2003 / 100145 (Claims) Japanese Patent No. 4021794 (Claims) JP 2006-200096 A (Claims) JP 2004-285499 A (Claims) JP 2006-83512 A (Claims)

  Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and polyester that has improved surface fluff and soft texture and stretch characteristics when used in woven and knitted fabrics with improved fuzz and tarmi. An object of the present invention is to provide a composite fiber, more specifically, a polytrimethylene terephthalate single fiber fineness polyester composite fiber.

  Another object of the present invention is to provide a method for producing the above-mentioned polyester composite fiber that has little yarn breakage and that can provide a stable processability.

  As a result of intensive studies to solve the above problems, the present inventors can avoid the fusion of PTT components during preheating before stretching in the production of PTT-based single fiber fineness polyester composite fibers, and The present inventors have found that the generation of fluff and talmi can be improved under the condition that there is no drawing failure, and the present invention has been achieved.

  That is, the present invention adopts the following configuration in order to achieve the above object.

(1) A composite fiber in which a high-viscosity polyester component and a low-viscosity polyester component are bonded in a side-by-side manner, wherein the high-viscosity polyester component is made of polytrimethylene terephthalate, the low-viscosity polyester component is made of polyethylene terephthalate, and A polyester crimped multifilament characterized by satisfying all of the following constituents (a) to (d):
(A) The single fiber fineness is in the range of 0.5 dtex to 1.5 dtex.
(B) The occurrence frequency of fuzz having a length of 3 mm or more is 0.30 / 10,000 m or less.
(C) The occurrence frequency of tarmi having a length of 3 mm or more is 0.20 k / m or less.
(D) Wooster spots U% (N) is 2.0% or less.

(2) Two components, polytrimethylene terephthalate, a high-viscosity polyester component, and polyethylene terephthalate, a low-viscosity polyester component, are combined in a side-by-side mold, melt-extruded from a spinneret, and cooled and solidified. When producing a polyester composite fiber by the direct spinning drawing method in which the first roll and the second roll are continuously drawn and wound without being wound once, the following process requirements (e) to (g) are satisfied. 2. The method for producing a polyester crimped multifilament according to claim 1, wherein all are satisfied.
(E) A treatment agent containing a phosphate metal salt in an amount of 6 to 20% by weight based on the active ingredient of the fiber treatment agent is 1.5 to 2 to 2. Deposit in the range of 0% by weight.
(F) The first roll temperature is controlled in the range of 45 ° C to 49 ° C.
(G) The air pressure of the confounding imparting device before the first roll is controlled in the range of 0.08 MPa to 0.15 MPa.

  According to the present invention, it is possible to obtain a polytrimethylene terephthalate-based single fiber fineness polyester composite fiber suitable for woven and knitted fabrics that could not be achieved by the prior art. More specifically, according to the present invention, fuzz and tarmi can be improved under conditions that can prevent fusion between PTT components during preheating before stretching, and there is no stretching failure, and is excellent when used for woven or knitted fabrics. In addition, a polytrimethylene terephthalate-based monofilament fine fiber polyester composite fiber that exhibits surface quality, soft texture, and stretch properties can be obtained.

  Hereinafter, the polyester composite fiber of the present invention and the production method thereof will be described in detail.

  First, the polyester composite fiber of the present invention will be described.

  The polyester composite fiber of the present invention takes a form in which a high-viscosity polyester component and a low-viscosity polyester component are bonded in a side-by-side manner in order to obtain good crimp characteristics. By laminating polyesters having different viscosities to the side-by-side type, stress concentrates on the high viscosity side during spinning and drawing, so that the internal strain differs among the components. Therefore, the high-viscosity side contracts greatly due to the difference in elastic recovery rate after stretching and the difference in thermal shrinkage in the heat treatment process of the fabric, and distortion occurs in the single fiber to take the form of a three-dimensional coil. The diameter of the three-dimensional coil and the number of coils per unit fiber length may be determined by the difference in shrinkage between the high-viscosity polyester component and the low-viscosity polyester component, and satisfy the coil crimp characteristics required as a stretch material. For this purpose, a difference in intrinsic viscosity of the polyester component is required.

  The intrinsic viscosity (IV) of the polyester component in the present invention is preferably in the range of 0.7 to 2.0 in the high viscosity polyester component on the high viscosity side. By setting the intrinsic viscosity to 0.7 or more, it becomes easy to produce a fiber having sufficient strength and elongation. A more preferable intrinsic viscosity is 0.8 or more. Further, when the intrinsic viscosity is 2.0 or less, production stability is easily obtained. A more preferable intrinsic viscosity is 1.8 or less.

  On the other hand, the low-viscosity polyester component on the low-viscosity side can obtain stable yarn-making properties by making the intrinsic viscosity 0.4 or more. A more preferable intrinsic viscosity is 0.5 or more. In order to obtain higher crimp characteristics, the intrinsic viscosity of the low viscosity polyester component is preferably 0.7 or less.

  In the present invention, in order to obtain a yarn having excellent crimp characteristics, it is preferable that the difference in intrinsic viscosity between the high-viscosity polyester component and the low-viscosity polyester component is 0.3 or more. When the difference in intrinsic viscosity is increased by 0.5 or more, a yarn having further excellent stretchability can be obtained. On the other hand, if the difference in intrinsic viscosity exceeds 1.5, the crimped property of the obtained fiber yarn is good, but the spun fiber yarn is bent excessively toward the high viscosity component, so it is stable for a long time. Therefore, it is not possible to produce the yarn, which is not preferable. Therefore, in order to satisfy both stable yarn-making property and stretch recovery property, the intrinsic viscosity difference is desirably in the range of 0.3 to 1.5.

  Here, it is important to use a polymer containing PTT as a main component for the high-viscosity polyester component of the polyester composite fiber of the present invention. In PTT, the methylene chain of the alkylene glycol part in the crystal structure is a Gauche-Gauche structure (molecular chain is bent at 90 °), and the density of constraining points due to the interaction between benzene rings (stacking, parallel) is low. Because of its high flexibility, it has a unique stretch-back property that the molecular chain is easily extended and recovered by the rotation of the methylene group, and can give a very soft texture.

  The PTT used in the present invention is PTT in which 90 mol% or more is composed of repeating units of trimethylene terephthalate. As used herein, PTT is a polyester obtained using terephthalic acid as the main acid component and 1,3-propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of less than 10 mol%. Examples of such a copolymer component include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid as the acid component, and examples of the glycol component include ethylene glycol. , Diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, and the like, but are not limited thereto.

  In addition, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives as antioxidants, and further flame retardants, antistatic agents, ultraviolet absorbers and coloring pigments, etc., as required. Can be added.

  On the other hand, for the low-viscosity polyester component of the polyester composite fiber of the present invention, it is important to use a polymer mainly composed of polyethylene terephthalate (hereinafter sometimes referred to as PET).

  As PET, which is a low-viscosity polyester component, a polyester having terephthalic acid as a main acid component and ethylene glycol as a main glycol component and having 90 mol% or more of ethylene terephthalate repeating units can be used. However, it may contain a copolymer component capable of forming another ester bond at a ratio of less than 10 mol%. Examples of such copolymer components include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, and examples of glycol components include ethylene glycol. , Diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, and the like, but are not limited thereto.

  Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives and coloring pigments as an antioxidant can be added to PET as necessary.

  By using PTT as described above for the polyester component of the polyester composite fiber of the present invention, the polyester composite fiber is referred to as a PTT polyester composite fiber.

  Next, the shape of the polyester composite fiber of the present invention will be described.

  It is preferable that the cross-sectional irregularity degree of the single fiber which comprises the polyester composite fiber of this invention is the range of 1.2-5.0. Such a modified cross-section fiber is different from a round cross-section fiber in that it has a cross-section anisotropy with respect to bending, and has a characteristic that it is easy to bend in the minor axis direction of the irregular cross-section and is difficult to bend in the major axis direction. . Therefore, when a composite interface is provided in the minor axis direction, bending due to a shrinkage difference occurs in a direction with high bending rigidity, so that twist is added to the coil crimp and coil crimp between the single fibers constituting the composite fiber yarn. This makes it difficult for these associations to occur and allows crimps to be expressed independently. Thereby, in fabrics, such as a woven or knitted fabric, a soft and repulsive feeling can be obtained with the swelling feeling and bulkiness peculiar to a deformed cross section. Fabrics made of polyester composite fibers having a single round cross section are substantially the same in the composite bonding surface between the single fibers, so that the crimped form is the same, and a smooth texture unique to synthetic fibers is obtained. By making the cross-section irregularity in the range of 1.2 to 5.0, it is possible to impart a preferable crimp-expressing random feeling and functionality. Further, considering the yarn production stability surface, the more preferable cross-sectional profile irregularity is in the range of 1.5 to 3.0.

  FIG. 1 is a schematic cross-sectional view for explaining the cross-sectional deformity of a single fiber constituting the polyester composite fiber of the present invention. In FIG. 1, the single fiber is composed of a region 1 made of a high-viscosity polymer containing PTT as a main component and a region 2 made of a low-viscosity polymer containing PET as a main component.

In FIG. 1, the cross-sectional irregularity defined in the present invention refers to the major axis length ab, which is the diameter of the circumscribed circle of the cross section of each single fiber, as the intersection of the composite interface and the fiber surface of the cross section of each single fiber. The value divided by the short axis length de, which is the distance between two points, indicates that the larger the value, the flatter. The cross-sectional profile of the single fiber is expressed by the following formula.
Degree of cross-sectional deformation of single fiber = major axis length ab / minor axis length de.

  In addition, the composite ratio of the high-viscosity polyester component and the low-viscosity polyester component of the polyester composite fiber of the present invention is a high-viscosity component in terms of yarn production, crimp performance, and dimensional uniformity of the coil in the fiber length direction. : Low viscosity component = 80: 20 to 20:80 (% by weight) is preferable, and a more preferable composite ratio is in the range of 70:30 to 30:70.

The composite ratio defined in the present invention is a cross-sectional area ratio of two kinds of polyester components constituting a single fiber in a cross-sectional photograph of the single fiber. The cross-sectional area ratio is expressed by the following equation.
Cross-sectional area ratio = cross-sectional area of high-viscosity polyester component / cross-sectional area of low-viscosity polyester component.

  It is important that the single fiber fineness of the single fiber constituting the polyester composite fiber of the present invention is in the range of 0.5 to 1.5 dtex. By making the single fiber fineness 0.5 dtex or more, it is possible to produce industrially stable yarns, and by making the single fiber fineness 1.5 dtex or less, the polyester composite fiber of the present invention is used for fabrics, particularly woven and knitted fabrics. A sufficient soft feeling can be obtained. The smaller the single fiber fineness, the better the softness when made into a fabric. Therefore, it is preferably in the range of 0.5 to 1.2 dtex, more preferably in the range of 0.5 to 1.0 dtex. In order to achieve the single fiber fineness as described above, the discharge amount and the spinneret (number of holes) may be appropriately changed in the production of the polyester composite fiber.

  The single fiber fineness of the single fiber constituting the polyester composite fiber of the present invention is referred to as a single fiber fineness polyester composite fiber as described above.

  Next, physical properties of the polyester composite fiber of the present invention will be described.

  In the polyester composite fiber of the present invention, in order to obtain an excellent fabric surface quality when woven or knitted, in the longitudinal direction of the polyester composite fiber, the occurrence frequency of fluff having a length of 3 mm or more is 0.30 co / 10, It is necessary that the occurrence frequency of talmi having a length of 3 mm or more is 0.20 co / m or less. When the length of the fluff having a length of 3 mm or more exceeds 0.30 / 10,000 m, the fluff appears on the surface of the fabric when used as a fabric, and the surface uniformity and texture are poor. The same applies to fibers having a length of 3 mm or more of tarmi exceeding 0.20 k / m. If both the fluff and the tarmi do not satisfy the above-mentioned requirements, it is not possible to obtain a fabric with a uniform surface and a good texture. Both the fluff and the tarmi occurrence frequency are preferably closer to 0. In the polyester composite fiber of the present invention, the more preferable fluff occurrence frequency is 0.10 / 10,000 m or less, and the tarmi occurrence frequency is 0.10 / m or less. In order to achieve the fuzz and the occurrence frequency of the tarmi as described above, as described later, in the production of the polyester composite fiber, it is possible to avoid the fusion between the PTT components at the time of preheating before stretching, and there is no stretching failure. And it is sufficient.

  Further, in the polyester composite fiber of the present invention, in order to obtain an excellent fabric surface quality when the woven or knitted fabric is obtained, Wooster unevenness U% (N), which is an index of thickness unevenness in the longitudinal direction of the yarn, is 2.0%. It is necessary that: When the polyester composite fiber has a Wooster blotch U% (N) of more than 2.0%, when it is made into a fabric due to dyed spots resulting from fineness spots, defects such as horizontal spots and vertical stripes occur. Further, a uniform and beautiful fabric surface cannot be obtained due to shrinkage spots of the yarns constituting the fabric. The Worcester unevenness U% (N) is more preferable as it approaches a value with no fiber yarn thickness unevenness, that is, 0%. In the polyester composite fiber of the present invention, the more preferable Wooster unevenness U% (N) is 1.5. % Or less. In order to achieve the above-mentioned U% (N), as described later, the conditions may be such that uniform stretching is possible in the production of the polyester composite fiber.

  The polyester composite fiber of the present invention preferably has a breaking elongation of 20 to 50%. By setting the elongation at break to 20% or more, the occurrence of stretch breaks can be suppressed, and industrially stable production becomes possible. Alternatively, by setting the breaking elongation to 50% or less, the breaking strength becomes 2.8 cN / dtex or more, and a good tear strength can be obtained in the fabric. A more preferable elongation at break is in the range of 25 to 45%.

  In addition, in order to overcome the fabric restraining force and stably crimp the coil, the temperature indicating the contraction stress and the maximum of the contraction stress may be an important characteristic. The higher the shrinkage stress, the better the crimp development under fabric restraint, and the higher the temperature showing the maximum shrinkage stress, the easier the handling in the finishing process. Therefore, in order to enhance the crimp development in the heat treatment step of the fabric, the temperature range showing the maximum shrinkage stress is 110 to 200 ° C, preferably 120 to 200 ° C, more preferably 125 ° C to 200 ° C. It is.

The shrinkage stress of the polyester composite fiber of the present invention is preferably in the range of 0.05 to 0.30 cN / dtex. When the maximum value of the shrinkage stress exceeds 0.30 cN / dtex, the wound composite yarn shrinks with time and causes tightening, resulting in fluctuations in the unwinding tension, causing wrinkles in the fabric and the quality. May decrease. When the shrinkage stress is less than 0.05 cN / dtex, sufficient shrinkage performance does not occur due to the restraint by the tissue when the fabric is made, and the feeling of swelling is poor. A more preferable maximum value of shrinkage stress is in the range of 0.10 to 0.28 cN / dtex. Moreover, the temperature which shows the maximum of the shrinkage stress and shrinkage stress said here uses the Kanebo Engineering thermal-stress measuring machine KE-2S, sample length is 200 mm, and it applies 3.27 * 10 ^<-2 > cN / dtex as an initial load. When the temperature is increased from 20 ° C. to 200 ° C. at a rate of temperature increase of 300 ° C./120 seconds, the maximum stress value when a stress versus temperature curve is drawn and the temperature at that time are indicated.

  Subsequently, the preferable manufacturing method of the polyester composite fiber of this invention is demonstrated.

  As the method for producing the polyester composite fiber of the present invention, the fiber yarn discharged from the spinneret is once wound on a drum and then drawn or drawn false twisted, or the fiber yarn is drawn continuously at the spinning stage. The method etc. are mentioned. Next, these manufacturing methods will be specifically described.

  The polyester composite fiber of the present invention is prepared by melting and extruding PTT and PET respectively, sending them to a predetermined composite pack using a composite spinning machine, filtering both polymers in the pack, and bonding them to a side-by-side mold using a spinneret. After spinning and winding up the unstretched yarn, it can be produced by a two-step method in which it is stretched to a predetermined breaking elongation with a normal stretching machine. Alternatively, it can also be produced by a one-step method in which the fiber yarn discharged from the spinneret is continuously drawn without being wound once. Considering quality stability and production stability in the longitudinal direction of the fiber, production by the direct spinning drawing method (hereinafter sometimes referred to as DSD method) is the best.

  When the polyester composite fiber of the present invention is produced by the DSD method, the fiber yarn discharged from the spinneret is cooled and solidified, and then the phosphate metal salt is added in an amount of 6 to 20% by weight with respect to the active ingredient of the fiber treatment agent. % Treatment agent is applied to the fiber surface in a range of 1.5% by weight to 2.0% by weight based on the fiber weight before stretching.

  The phosphate metal salt not only imparts antistatic properties to the polyester composite fiber, but also has an effect of preventing metal abrasion in rubbing between the polyester composite fiber and the metal, and suppresses abrasion with guides other than the metal. Since it is effective, the generation of fluff during spinning can be suppressed. If the content of the phosphate metal salt is less than 6% by weight, the effect of reducing scratching cannot be sufficiently obtained, and generation of fluff cannot be suppressed. On the other hand, when the content of the phosphate metal salt exceeds 20% by weight, the viscosity of the treating agent increases, and the tension increases when the composite fiber comes into contact with the rolls and guides of the spinning machine, which is not preferable for the yarn production. It becomes.

  Moreover, the adhesion amount of the treatment agent is from the viewpoint of avoiding fusing of PTT components and preventing generation of fluff and tarmi by forming a sufficient oil film on the fiber surface during preheating before stretching in the first roll. , 1.5 wt% to 2.0 wt%. When the adhesion amount is less than 1.5% by weight, a sufficient oil film is not formed on the fiber surface, it is impossible to avoid fusion of PTTs during preheating before stretching, and generation of fluff and tarmi cannot be suppressed. On the other hand, if the adhesion amount exceeds 2.0% by weight, the friction coefficient of the fiber surface becomes too large, so that stable yarn-making properties cannot be obtained, and sufficient preheating cannot be performed before stretching, resulting in poor stretching. .

  In addition to the phosphate metal salt component, the treatment agent used in the present invention includes conventionally used polyethers, smoothing agents, emulsifiers, antioxidants, and antistatic agents within a range not impairing the effects of the present invention. You may mix | blend additive components, such as an agent. As the treatment agent, it is appropriate to apply to the fiber yarn as an aqueous emulsion containing the treatment agent component in an amount of 1.0% to 20.0% by weight, but it does not contain water and only the treatment agent or an organic solvent. Diluted with can also be used. At this time, as a method for applying the treatment agent, a conventionally used method such as an oiling roller method or a method using a nozzle can be used.

  When the fiber yarn to which the treatment agent (oil agent) is applied by the above method is stretched between the first roll and the second roll, it is 0.08 MPa to It is preferable to provide entanglement with an air pressure in the range of 0.15 MPa. By confounding with an air pressure of 0.08 MPa or more in the process before the first roll, the converging property of the filament constituting the fiber yarn is improved, so that filament breakage on the roll can be suppressed, and the filament In addition to being able to maintain a uniform stretching between the first roll, the workability after the first roll is improved, and a product with less fuzz and sagging can be obtained. On the other hand, if the air pressure exceeds 0.15 MPa, the number of entanglement points becomes too large, resulting in poor stretching.

  Moreover, in manufacture of the polyester composite fiber of this invention, the temperature of a 1st roll is 45 to 49 degreeC. Generally, when a polyester composite fiber yarn is drawn, it is necessary to preheat the glass transition temperature or higher before drawing. The glass transition temperature of PTT used in the present invention is around 43 ° C. In order to avoid the fusion of PTT components during preheating and to suppress the occurrence of fluff and tarmi, the preheating temperature is set to the glass transition temperature of PTT as much as possible. It is preferable to approach. The polyester composite fiber of the present invention has a single fiber fineness of 0.5 dtex to 1.5 dtex and an extremely fine fineness, and since the area of the fiber surface is large, sufficient preheating by setting the first roll temperature to 45 ° C. or higher, That is, uniform stretching is possible. On the other hand, when the first roll temperature exceeds 49 ° C., the surface area of the fiber surface is large, so that fusion of PTT components cannot be avoided, and generation of fluff and tarmi cannot be suppressed, and thermal crystallization is caused. The elongation of the fiber length becomes too large, the yarn running state on the first roll becomes unstable, and the yarn interference yarn breakage occurs.

  Furthermore, when a godet roller is provided between the second roll and winding, cooling of the heat-set fiber yarn can be promoted, and the tension applied to the fiber yarn can be easily adjusted, and a good package can be obtained. It becomes easy to obtain.

  Next, as an example of the method for producing the polyester conjugate fiber of the present invention, a method using a first hot roller, a second hot roller, and two godet rollers will be described in detail.

  In melt spinning the polyester composite fiber of the present invention, it is preferable that the PTT that is one high-viscosity polyester component is melted at a temperature in the range of 240 to 280 ° C. Examples of a method for melting PTT include a pressure melter method and an extruder method. From the viewpoints of uniform melting and prevention of retention, melting by an extruder method is preferable.

  On the other hand, it is preferable that PET, which is the other low-viscosity polyester component, is melted at a temperature in the range of 280 to 300 ° C. using an extruder similarly to PTT.

  Separately melted polymers pass through separate pipes, weigh and then flow into the spinneret pack. At this time, from the viewpoint of suppressing thermal degradation, the pipe passage time is preferably within 30 minutes. The two polymers flowing into the pack are merged by the above-described spinneret, combined in a side-by-side form, and discharged from the spinneret. The spinning temperature at this time is suitably in the range of 265 to 280 ° C. If the spinning temperature is within this range, a polyester composite fiber utilizing the characteristics of PTT can be produced.

  The polymer discharged from the spinneret is cooled and solidified, and after a treatment agent (oil agent) is applied, the polymer is entangled by a entanglement device and wound through a hot roller and a godet roller. The winding speed can usually be produced in the range of 2500 to 5000 m / min, and in consideration of process stability, the winding speed is preferably in the range of 2700 to 4500 m / min. If necessary, the number of entanglements can be increased by providing a plurality of entanglement devices between the treatment agent (oil agent) application and winding. Further, a treatment agent (oil agent) can be additionally provided immediately before winding.

  Next, an apparatus preferably used in the yarn production process will be described.

  FIG. 2 is a side view showing an example of a spinning process (direct spinning drawing method) preferably used in the present invention.

  In FIG. 2, the fiber yarn discharged from the spinneret 3 is cooled, and then the oil agent is applied by the oil agent applying device 5, and then entangled by the entanglement device 6. Next, it is wound around the first hot roller 7 having a mirror surface and preheated at a temperature in the range of 45 to 49 ° C. and at a speed of 1000 to 3500 m / min, and then stretched with the second hot roller 8. Is done. Further, a godet roller 10 that is wound around several turns on the second hot roller 8 in the temperature range of 90 to 180 ° C., heat-set, and rotates at a speed that is −10 to 10% faster than the hot roller 8 via the confounding device 9. , 11 is routed. The heat-set fiber yarn is cooled by the godet rollers 10 and 11 and the tension is adjusted, and is wound around the package 13 by a winder at a speed of 2500 to 5000 m / min. In the winder, the package winding tension is adjusted by the contact roller 12 in contact with the package 13.

  Here, the first hot roller 7 is preferably a mirror roller, and the godet roller is preferably a mirror surface or a grooved mirror roller. The mirror surface here has a roller surface roughness of 1S or less, and the satin surface has a surface roughness of 2-4S. The surface roughness is a maximum height (Rmax) classification described in JIS-B-0601. By using a mirror surface or a grooved mirror surface, the fiber yarn can be efficiently gripped. Therefore, the fiber yarn can run stably while maintaining a constant tension before and after the roller, and a product of good quality with little variation in physical properties in the longitudinal direction of the fiber yarn (raw yarn) is facilitated.

  As the godet roller, a satin roller can be used, but in order to maintain the yarn gripping property, a higher degree of tension management is required than a mirror surface or grooved mirror surface roller. If a fiber yarn slip occurs on the godet roller, fineness spots, shrinkage spots and dyeing spots are induced in the longitudinal direction of the fiber yarn (raw yarn). Causes degradation. When high tension management is required, it is an effective means to install a plurality of godet rollers.

  On the other hand, by setting the speed of the contact roller 12 to be 1.001 to 1.01 times faster than the winding speed of the package 13, it is possible to easily obtain a good bulge rate and ear height rate of the package 13. By setting the contact roller speed overfeed to 1.001 or more, it is possible to reduce the tension when wound on the package 13 and to suppress the swelling rate and the ear height rate. A more preferable range of overfeed is 1.0015 or more. Further, by setting the overfeed to 1.01 or less, it is possible to prevent the thread from dropping from the end face of the package, and it is possible to ensure a good unwinding property. A more preferable overfeed range is 1.008 or less.

  Further, the tension of the fiber yarn at the contact roller entrance is preferably in the range of 0.1 to 0.3 cN / dtex. By setting the tension to 0.1 cN / dtex or more, the yarn swing between the godet roller 12 and the winder can be reduced, and the fiber yarn can be stably wound even when the winding speed is increased. it can. A more preferable tension is 0.12 cN / dtex or more. Further, when the tension is 0.3 cN / dtex or less, the tension control with the contact roller 12 becomes easy, and a good package foam can be obtained. A more preferable tension is 0.25 cN / dtex or less.

  The polyester conjugate fiber of the present invention can be suitably used as a stretch woven or knitted fabric, for example, for shirts, blouses, pants and suits. As the woven fabric, it may be used alone for warp or weft, may be used by blending or interweaving with other fiber yarns, and any method that exhibits the characteristics of the polyester composite fiber of the present invention may be used. There is no problem. Moreover, as a knitted fabric, it is preferable to use it for knit products, such as a shirt, a swimsuit, and an inner. This is because when the polyester composite fiber of the present invention is used for a knitted fabric having a weak fabric binding force, the individual single fibers have a fineness, so that the phases of crimps do not coincide with each other. This is because a fabric having a good surface quality can be provided.

  Hereinafter, although the polyester composite fiber of this invention is demonstrated concretely with an Example, this invention is not limited to these Examples. The measured value of the Example was measured by the following method.

(1) Intrinsic viscosity (IV)
Ηr in the definition formula is as follows. For PTT, 0.8 g of sample polymer is dissolved in 10 mL of o-chlorophenol (hereinafter abbreviated as OCP) at a temperature of 160 ° C. of 98% or more, and cooled to a temperature of 25 ° C. Thereafter, the relative viscosity ηr was obtained by the following equation using an Ostwald viscometer, and the intrinsic viscosity (IV) was calculated. For other polymers, 0.8 g of the sample polymer was dissolved in 10 mL of OCP having a purity of 98% or more at a temperature of 25 ° C., and the relative viscosity ηr was obtained from the following equation using an Ostwald viscometer at a temperature of 25 ° C. (IV) was calculated.
Ηr = η / η ₀ = (t × d) / (t ₀ × d ₀ )
Intrinsic viscosity (IV) = 0.0242 ηr + 0.2634
here,
η: Viscosity of polymer solution η ₀ : OCP viscosity t: Solution drop time (seconds)
d: density of the solution (g / cm ³ )
t ₀ : OCP fall time (seconds)
d ₀ : Density of OCP (g / cm ³ ).

(2) Breaking strength (cN / dtex) and elongation at break (%)
According to JIS L1013 (1999), measurement was performed using Tensilon UCT-100 manufactured by Orientec.

(3) Wooster spots U% (N)
Thickness unevenness in the longitudinal direction of the yarn (normal test) is obtained by using a Worcester tester UT-4CX manufactured by Twelvegar Worcester Co., and obtaining a fineness variation chart (Diagram Mass) under the following measurement conditions, and at the same time an average deviation rate in the normal mode. (U%) was measured.
・ Yarn feeding speed: 200 m / min ・ Measured yarn length: 200 m
-Twister: S twist 12000 turns / minute-Disc tension strength: 10%
Scale: -10% to + 10%

(4) Fluff occurrence frequency (co / 10,000m)
The packaged polyester composite fiber yarn was placed on a warping machine equipped with a fluff detection device and taken up at a speed of 500 m / min. Each time the warping machine stopped, the presence or absence of fluff was visually confirmed, and the number of fluff having a length of 3 mm or more was counted. About each Example and each comparative example, 50,000 m x 32 samples, a total of 1,600,000 m were measured, and the average number of fluffs per 10,000 m was calculated.

(5) Tarmi frequency (co / m)
Using a microscope, the form of crimp was confirmed at a magnification of 150 times, and the number of tarmi having a length of 3 mm or more was counted. For each example and each comparative example, 10 m × 10 samples were observed for a total of 100 m, and the average number of tarmi per 1 m was calculated.

(6) Maneuverability (spinning property)
Using a 32-spindle direct spinning drawing machine, continuous spinning was performed for 168 hours (7 days), and the yarn forming property (yarn breakage rate) was evaluated in the following four stages. The passing level is ◯ or higher.
◯: Thread breakage rate is less than 3.0% ◯: Thread breakage rate is 3.0% or more and less than 5.0% Δ: Thread breakage rate is 5.0% or more and less than 7.0% ×: Thread breakage rate 7.0% or more.

(7) Fabric surface quality Using the non-twisted and glued yarn of 56 dtex-24 filament PET fiber as the warp, and using the PTT fiber yarn of each of the examples and comparative examples of the present invention as the weft, the following plain fabric is used: Created.
Warp density: 110 / 2.54 cm
Weft density: 98 / 2,54cm
Loom: Water jet room ZW-303 manufactured by Tsudakoma Corporation
Weaving speed: 450 rotations / minute The obtained green machine is continuously refined at 95 ° C using an open soaper, dried in a cylinder at 120 ° C, and then dyed at 120 ° C using a liquid dyeing machine. Went. Subsequently, a series of finishing and width setting heat treatments were performed at a temperature of 175 ° C. The obtained fabric was inspected by a skilled inspection engineer, and the weft dyeing quality and surface texture were evaluated in the following four stages. The passing level is ◯ or higher.
○: No defects in stained spots, surface uniformity / soft texture is very good ○: No defects in stained spots, surface uniformity / soft texture is good △: No defects in stained spots, surface uniformity / Soft texture is poor x: There is a defect of stained spots, surface uniformity and soft texture are poor.

(Examples 1-11, Comparative Examples 1-11)
About the present Example and the comparative example, the polyester composite fiber was obtained by DSD method on the manufacturing conditions as Table 1-Table 4. In the table, the hot roller is referred to as HR, the godet roller as GR, and the contact roller as CR.

[Example 1]
PTT having an intrinsic viscosity of 1.43 and PET having an intrinsic viscosity of 0.51 were melted at temperatures of 260 ° C. and 285 ° C. using an extruder, respectively, and the composite ratio was 5/5 at a polymer temperature of 270 ° C. The pump was weighed so that each polymer had a viscosity of 9.9 g / min, and was poured into a known composite mouthpiece having a discharge hole shape having a discharge hole number of 48 and a cross section irregularity of 1.4. The pressure applied to the die was 15 MPa for each polymer. Further, the pipe passing time of each polymer was 12 minutes for PTT and 8 minutes for PET. The yarn discharged from the die was spun and drawn using the equipment shown in FIG. That is, the polyester composite fiber yarn discharged from the spinneret 3 is cooled by the yarn cooling blower 4, and the treatment agent containing 8 wt% of the phosphate metal salt is added to the fiber treatment agent active ingredient by the oil agent application device 5. 1.7% by weight based on the fiber weight was attached, and entangled by an entanglement device 6 at an air pressure of 0.10 MPa, and then taken up by the first hot roller 7 heated to a temperature of 48 ° C. at a speed of 1160 m / min, Without winding up, the film was drawn around the second hot roller 8 heated to a temperature of 155 ° C. at a speed of 3780 m / min, and stretched and heat set. Further, entanglement is applied again by the entanglement device 9 and drawn around the two godet rollers 10 and 11 at a speed of 3610 m / min, then the tension at the entrance of the contact roller 12 is 0.13 cN / dtex, and the contact roller speed is 3782 m / min. Then, the package was wound at a package winding speed of 3575 m / min, that is, with an overfeed of 1.0020 and wound on the package 13 to obtain a polyester composite fiber yarn having 56 dtex-48 filaments and a cross-sectional profile of 1.4. The property evaluation results of this composite fiber yarn are as shown in Table 1, and very excellent yarn forming property and fabric surface quality were obtained.

[Example 2]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the content of the phosphate metal salt of the fiber treatment agent was 14% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 1, and the viscosity of the treatment agent is increased, and the tension when the fiber yarn contacts the rolls and guides of the spinning machine is slightly increased. Was one step away from Example 1, but the occurrence frequency of fluff and tarmi was excellent, and the surface quality of the fabric was very excellent as in Example 1.

[Example 3]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the adhesion amount of the fiber treatment agent was 1.5% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 1, and the yarn-making property was as excellent as that of Example 1, but the formation of oil film on the fiber surface was slightly reduced, and generation of fluff and tarmi was caused. The frequency slightly increased, and the fabric surface quality was a step over to Example 1.

[Example 4]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the attached amount of the fiber treatment agent was 2.0% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 1. The coefficient of friction on the fiber surface was slightly increased, and the yarn-synthesizing property was a step away from Example 1. The fabric surface quality was as excellent as that of Example 1.

[Example 5]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the air pressure of the entanglement imparting device 6 was 0.15 MPa. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 1, and the yarn-making property was as excellent as that of Example 1. However, since there are many entanglement points before drawing, the uniformity of drawing is slightly inferior. From the point of dyeing spots, the surface quality of the fabric was transferred to Example 1.

[Example 6]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the air pressure of the entanglement imparting device 6 was 0.08 MPa. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 2, and the yarn-making property was as excellent as that of Example 1, but the converging property of the filament was slightly lowered, so that the occurrence frequency of fluff and tarmi was low. Slightly increased, the fabric surface quality was a step over to Example 1.

[Example 7]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the temperature of the first hot roller 7 was 49 ° C. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 2, and the yarn-making property was as excellent as that of Example 1. However, the PTT component was slightly fused at the time of drawing preheating, and fluff Since the occurrence frequency of talmi slightly increased, the surface quality of the fabric was transferred to Example 1.

[Example 8]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the temperature of the first hot roller 7 was 45 ° C. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 2, and the preheating temperature before drawing is slightly low, and the uniformity of drawing is slightly inferior, so both the yarn forming property and the fabric quality are a step away from Example 1. became.

[Example 9]
A yarn was produced in the same manner as in Example 1 except that the discharge amount was 5.9 g / min for each polymer, and the die was changed to a discharge hole shape having a cross-sectional deformity of 1.2. A 33 dtex-48 filament Thus, a polyester composite fiber yarn having a cross-sectional deformity of 1.2 was obtained. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 2. Since the total fineness was reduced, the yarn-making property was transferred to Example 1, but the fabric surface quality was determined by the area of the fiber surface. Although the occurrence frequency of fluff and talmi slightly increased with the increase, a very excellent softness was obtained.

[Example 10]
Example 1 except that the spinneret was changed to a discharge hole shape such that the number of discharge holes was 72 and the cross-sectional deformity was 1.2, and the hole diameter was such that the pressure applied to the nozzle was 15 MPa for each polymer. Yarn was produced in the same manner to obtain a polyester composite fiber yarn having 56 dtex-72 filaments and a cross-sectional deformity of 1.2. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 2, and the single yarn fineness was reduced, so that the yarn-making property was transferred to Example 1, but the fabric surface quality was the area of the fiber surface. Although the occurrence frequency of fluff and tarmi increased slightly due to the increase in, a product with excellent softness was obtained.

[Comparative Example 1]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the content of the phosphate metal salt of the fiber treatment agent was 25% by weight. The property evaluation index of the obtained composite fiber yarn is as shown in Table 3, and the viscosity of the treatment agent is increased, and the tension when the fiber yarn contacts the rolls and guides of the spinning machine is increased. Even in the fabric surface quality, the tension at the stretching stage was not constant and the stretching uniformity was inferior, and it was inferior to Example 1 in terms of dyeing spots.

[Comparative Example 2]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the content of the phosphate metal salt of the fiber treatment agent was 4% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 3, and the yarn-making property was very excellent as in Example 1, but the fretting reduction effect could not be sufficiently obtained and the fluff frequency increased. Therefore, the surface quality of the fabric did not reach that of Example 1.

[Comparative Example 3]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the adhesion amount of the fiber treatment agent was 1.3% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 3, and the yarn-making property was very excellent as in Example 1, but the oil film formation on the fiber surface was insufficient and the PTT components were The frequency of occurrence of fluff and sagging due to fusion of the fabric increased, and the surface quality of the fabric did not reach that of Example 1.

[Comparative Example 4]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the adhesion amount of the fiber treatment agent was 2.5% by weight. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 3, the friction coefficient on the fiber surface is excessive, and the yarn-making property is not as great as in Example 1, and the oil film formation on the fiber surface is also formed with respect to the fabric surface quality. Since it was excessive and preheating before drawing was insufficient and the uniformity of drawing was inferior, it was not as good as Example 1 in terms of stained spots.

[Comparative Example 5]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the air pressure of the entanglement imparting device 6 was 0.18 MPa. The characteristic evaluation indexes of the obtained composite fiber yarns are as shown in Table 3. Since the number of entanglement points before drawing is large, the uniformity of drawing is inferior. Thus, the surface quality of the fabric did not reach that of Example 1.

[Comparative Example 6]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the air pressure of the entanglement imparting device 6 was 0.04 MPa. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 4, and since the convergence property of the filament was greatly reduced, the yarn-making property was transferred to Example 1, and the occurrence frequency of fluff and sagging increased. The fabric surface quality was not much higher than that of Example 1.

[Comparative Example 7]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the temperature of the first hot roller 7 was 55 ° C. Characteristic evaluation indexes of the obtained composite fiber yarn are as shown in Table 4. Since the yarn running state on the first hot roller became unstable and the yarn interference yarn breakage occurred, the yarn forming property reached that in Example 1. In addition, since the occurrence frequency of fluff and sagging increased due to the fusion of the PTT components, the fabric surface quality did not greatly exceed that of Example 1.

[Comparative Example 8]
A polyester composite fiber yarn was obtained in the same manner as in Example 1 except that the temperature of the first hot roller 7 was 40 ° C. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 4, and the preheating temperature before drawing becomes insufficient and the uniformity of drawing is greatly inferior, so that both the yarn forming property and the fabric surface quality are large in Example 1. It was unacceptable.

[Comparative Example 9]
A yarn was produced in the same manner as in Example 1 except that the discharge amount was 15.0 g / min for each polymer and the spinneret was changed to a discharge hole shape having a cross-sectional deformity of 2.1, and 84 dtex-48. A polyester composite fiber yarn having a filament cross section degree of deformation of 2.1 was obtained. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 4, and the yarn forming property was very excellent as in Example 1, but the softness was inferior because the single fiber fineness was increased. The fabric surface quality did not reach that of Example 1.

[Comparative Example 10]
Example 1 except that the spinneret was changed to a discharge hole shape in which the number of discharge holes was 24, the cross-sectional profile was 2.6, and the hole diameter was 15 MPa for each polymer. Yarn was produced in the same manner to obtain a polyester composite fiber yarn with 56 dtex-24 filaments and a transverse section irregularity of 2.6. The characteristic evaluation index of the obtained composite fiber yarn is as shown in Table 4, and the yarn forming property was very excellent as in Example 1, but the softness was inferior because the single fiber fineness was increased, The fabric surface quality did not reach that of Example 1.

[Comparative Example 11]
PET having an intrinsic viscosity of 0.78 and PET having an intrinsic viscosity of 0.51 were separately melted at a temperature of 285 ° C. using an extruder, and the composite ratio was 5/5 at a polymer temperature of 290 ° C. The pump was weighed so that the polymer would be 9.1 g / min, and was allowed to flow into a known composite nozzle having a discharge hole shape having 48 discharge holes and a cross-sectional profile of 1.4. The pressure applied to the spinneret was 15 MPa for each polymer. Moreover, the piping passage time of each polymer was 8 minutes. The fiber yarn discharged from the spinneret was spun and drawn using the equipment shown in FIG. That is, the polyester composite fiber yarn discharged from the spinneret 3 is cooled by the yarn cooling blower 4, and the treatment agent containing 8 wt% of the phosphate metal salt is added to the fiber treatment agent active ingredient by the oil agent application device 5. 1.7% by weight based on the fiber weight was attached, and entangled by the entanglement device 6 at an air pressure of 0.10 MPa, then taken up by the first hot roller 7 heated to a temperature of 90 ° C. at a speed of 1450 m / min, Without winding up, the film was drawn around the second hot roller 8 heated to a temperature of 3430 m / min, and stretched and heat set. Further, entanglement is applied again by the entanglement device 9, and after drawing around the two godet rollers 10, 11 at a speed of 3275 m / min, the tension at the entrance of the contact roller 12 is 0.13 cN / dtex, the contact roller speed is 3250 m / min. The package was wound at a package winding speed of 3245 m / min, that is, with an overfeed of 1.0020, and wound on the package 13 to obtain a polyester composite fiber yarn having 56 dtex-48 filaments and a cross-sectional profile of 1.4. The property evaluation results of this composite fiber yarn are as shown in Table 4, and the yarn-making property was as excellent as that of Example 1, but the texture was hard in the fabric surface quality and greatly affected Example 1. It was not

FIG. 1 is a schematic cross-sectional view for explaining the cross-sectional deformity of a single fiber constituting the polyester composite fiber of the present invention. FIG. 2 is a side view showing an example of a spinning process (direct spinning drawing method) preferably used in the present invention.

Explanation of symbols

1: Region composed of polymer on the high viscosity side mainly composed of PTT 2: Region composed of polymer on the low viscosity side mainly composed of PET 3: Spinneret 4: Yarn cooling blower 5: Oil supply device 6: Entangling device 7: First hot roller 8: Second hot roller 9: Entangling device 10: Godet roller 11: Godet roller 12: Contact roller 13: Package

Claims (2)

A composite fiber in which a high-viscosity polyester component and a low-viscosity polyester component are bonded in a side-by-side manner, wherein the high-viscosity polyester component is made of polytrimethylene terephthalate, the low-viscosity polyester component is made of polyethylene terephthalate, and A polyester crimped multifilament characterized by satisfying all the constituent requirements of (a) to (d).
(A) The single fiber fineness is in the range of 0.5 dtex to 1.5 dtex.
(B) The occurrence frequency of fuzz having a length of 3 mm or more is 0.30 / 10,000 m or less.
(C) The occurrence frequency of tarmi having a length of 3 mm or more is 0.20 k / m or less.
(D) Wooster spots U% (N) is 2.0% or less. Two components, polytrimethylene terephthalate, a high-viscosity polyester component, and polyethylene terephthalate, a low-viscosity polyester component, are combined in a side-by-side mold, melt-extruded from a spinneret, cooled and solidified, and the resulting fiber yarn is once wound up Without manufacturing the polyester composite fiber by the direct spinning and drawing method that continuously draws and winds between the first roll and the second roll, the following process requirements (e) to (g) are all satisfied: A process for producing a polyester crimped multifilament according to claim 1.
(E) A treatment agent containing a phosphate metal salt in an amount of 6 to 20% by weight based on the active ingredient of the fiber treatment agent is 1.5 to 2 to 2. Deposit in the range of 0% by weight.
(F) The first roll temperature is controlled in the range of 45 ° C to 49 ° C.
(G) The air pressure of the confounding imparting device before the first roll is controlled in the range of 0.08 MPa to 0.15 MPa.

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