JP2009144277A - Composite yarn, woven/knitted fabric using the same, and method for producing the composite yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite yarn excellent in puffiness, stretchability, soft touch, resilient feeling and natural unevenness feeling, all of which are typical of high-grade wool, to provide a method for producing the composite yarn, and to provide a woven/knitted fabric using the composite yarn. <P>SOLUTION: The composite yarn is such that at least two kinds of polyester multifilaments A and B are combined with each other and the following properties (1) and (2) are satisfied simultaneously: (1) 1.5≤U%(%)≤10, and (2)-5≤boiling water shrinkage difference(A-B)(%)≤5. In this composite yarn, the multifilamnets A are uneven conjugate multifilaments having the ability to express crimps, and the multifilaments B are uneven multifilaments. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a composite yarn excellent in swelling, stretchability, soft feeling, resilience and natural unevenness, a method for producing the same, and a woven or knitted fabric using the composite yarn.

  Polyester fibers are excellent in mechanical strength, chemical resistance, heat resistance and the like, and are widely used in clothing applications. In recent years, market needs have been diversified, and there is an increasing demand for such polyester fibers, particularly polyester long fibers, to produce a texture like high-grade wool. High-grade wool is composed of finely selected fine fibers, has a soft and delicate touch, and also exhibits a natural unevenness due to a multicolor mix effect in which various colors are mixed. Moreover, the original crimp of wool has a soft swell and excellent stretch.

  On the other hand, for example, it is proposed to improve stretch and bulge feeling by compound false twisting and blending a conjugate yarn in which different types of polyester polymers are bonded side-by-side along the fiber length direction. (For example, refer to Patent Document 1). However, these composite yarns can obtain stretch properties, but become monotonous bulges and do not have the delicate swell and soft feelings of the present invention, and need further improvement.

Further, as a method of imparting a swell or natural unevenness to a woven or knitted fabric, a method using a thick and fine yarn having a thick portion and details in the longitudinal direction of the yarn is generally used. Here, it is proposed that a stretch type and a swelling feeling can be obtained by using a conjugate type thick yarn as a core yarn and using a composite yarn mixed with a low shrinkage yarn (for example, patents) Reference 2). However, the conjugated thick yarn tends to selectively reveal crimps only in the detail in the drawing process, so when mixed with other yarns, the pre-entanglement tension is different due to the difference in the expression rate of crimp in the yarn longitudinal direction. There is a risk of occurrence of unevenness, entanglement unevenness and single yarn tarmi, and there is a problem that fluffing occurs in twisted yarn or weaving process due to unwinding or yarn breakage occurs frequently. Therefore, all the crimps of the conjugated thick yarn need to be latent, that is, there is a problem that the stretchability in the woven fabric is insufficient. Further, even in mixed fibers with other yarns, crimps are partially expressed by entangled pressure air, so that sufficient entanglement cannot be imparted, nep is generated in the twisted yarn or weaving process, and the quality of the fabric is poor. There was a problem of becoming. Further, since the yarn having thick and thin is located inside the composite yarn, the effect on the texture such as swell and natural unevenness caused by the thick and thin yarn was very small.
JP 2002-105786 A JP 2002-266185 A

  An object of the present invention is to solve the above-mentioned problems of the prior art, and a composite yarn excellent in swelling, stretchability, soft feeling, resilience, and natural unevenness, which are characteristics of high-grade wool, and its It is another object of the present invention to provide a production method and further a woven / knitted fabric using the composite yarn.

The present invention adopts the following configuration in order to achieve the above object. That is,
[1] A composite yarn in which at least two types of polyester multifilaments A and B are mixed, and the composite yarn satisfies the following properties (1) and (2) at the same time and constitutes the composite yarn A multifilament A is a thick conjugate multifilament having a crimp expression ability, and the multifilament B is a thick multifilament.
(1) 1.5 ≦ U% (%) ≦ 10
(2) -5 ≦ Boiling water shrinkage difference (AB) (%) ≦ 5
[2] The composite yarn according to [1], wherein the multifilament B contains particles having an average primary particle size of 0.02 to 0.1 μm.

  [3] A woven or knitted fabric comprising the composite yarn according to [1] or [2].

  [4] The knitted or knitted fabric according to [3], wherein the surface of the multifilament B has microvoids due to dropping of the particles.

  [5] A woven fabric characterized in that the composite yarn according to [1] or [2] is used for warp or weft, and the stretch rate in the yarn direction using the composite yarn is 10% or more.

  [6] Spinning a conjugate unstretched multifilament in which at least two component polyester polymers are joined in a side-by-side type or an eccentric seascore type, and another polyester-based unstretched multifilament with an elongation difference of 80% or less And then a method for producing a composite yarn obtained by drawing at a draw ratio of 1.7 to 2.5 times.

  By carrying out the present invention, a composite yarn excellent in swelling, stretchability, softness, rebound, natural unevenness, which is a characteristic of high-grade wool, a method for producing the same, and a woven or knitted fabric using the composite yarn Can be provided.

The composite yarn of the present invention is a composite yarn in which at least two types of polyester multifilament A and polyester multifilament B are mixed, and the composite yarn satisfies the following properties (1) and (2) simultaneously: Further, the polyester multifilament A constituting the composite yarn is a thick conjugate yarn having a crimping ability, and the polyester multifilament B is also a thick multifilament.
(1) 1.5 ≦ U% (%) ≦ 10
(2) -5 ≦ Boiling water shrinkage difference (AB) (%) ≦ 5
Polyester multifilament A and polyester multifilament B used in the present invention are mainly composed of terephthalic acid, and are composed of ethylene glycol, tetramethylene glycol, polypropylene glycol, cyclohexane-1,4-dimethanol, pentamethylene glycol, and hexamethylene glycol. It is a polyester having at least one selected main glycol component, and a 40% mol or less third component may be copolymerized. Preferred copolymerization components include dibasic acids such as adipic acid, sebacic acid, isophthalic acid, diphenyldicarboxylic acid, naphthalene dicarboxylic acid, oxyacids such as oxybenzoic acid, and diethylene glycol, propylene glycol, polyethylene glycol glycols, Examples include 5-sodium sulfoisophthalic acid and 2,2-bis {4- (2-hydroxyethoxy) phenyl} propane. A polyester obtained by copolymerizing one or two or more of these copolymer components is preferably used.

  Further, it is important that both the polyester multifilament A and the polyester multifilament B constituting the composite yarn used in the present invention have thick portions and details. When the thick part and the details are mixed and interleaved between the filaments, it is possible to express a swell in a woven or knitted fabric or a natural uneven feeling.

  Further, since the thick portions of each of the polyester multifilament A and the polyester multifilament B are deeply dyed and the thin portions are lightly dyed, a multicolor mixing effect can be obtained, and a natural sensation similar to wool can be obtained.

  In the present invention, it is important that U% representing the thickness unevenness of the composite yarn is 1.5 ≦ U% (%). If the U% is less than 1.5%, the thickening effect is small, and the fabric surface is not imparted with a sense of unevenness. On the other hand, even if U% is too large, the thinning effect is too great and the surface quality becomes rough, so U% is made 10% or less. A more preferable range of U% is a range of 2 to 6%.

  Polyester multifilament A is a conjugated thick multifilament having crimp-producing ability. The conjugate multifilament exhibits, for example, a coiled crimp with no angular portion peculiar to buckling or mechanical crimping by heat treatment.

  Examples of the conjugate multifilament include conjugate multifilaments in which at least two types of polymers or polymers of the same type but having different intrinsic viscosities are combined in a side-by-side type or an eccentric sea core type. That is, when at least two types of polymers are combined, at least two of the polyesters may be arbitrarily selected and combined. For example, polyethylene terephthalate and polypropylene terephthalate may be combined. Further, when the same kind of polymer is compounded, for example, polyethylene terephthalate having different intrinsic viscosities may be compounded. In this case, the intrinsic viscosity of the low viscosity polyester component is preferably in the range of 0.35 to 0.60, and the intrinsic viscosity of the high viscosity polyester component is preferably in the range of 0.65 to 0.85. If the intrinsic viscosity of the low-viscosity polyester component is less than 0.35, the melt viscosity becomes low and spinning becomes difficult. On the other hand, when the intrinsic viscosity of the low-viscosity polyester component exceeds 0.60, the crimping ability of the conjugate multifilament becomes poor, and the ability to develop coil crimping is reduced.

  Further, if the intrinsic viscosity of the high-viscosity polyester component exceeds 0.85, the melt viscosity becomes high, so that spinning and stretching become difficult. Further, when the intrinsic viscosity of the high-viscosity polyester component is less than 0.65, the crimp developing ability tends to be poor.

  The limiting viscosity difference between the low viscosity polyester component and the high viscosity polyester is preferably in the range of 0.20 to 0.40. However, when a copolymerized polyester component is used on one side, the difference in intrinsic viscosity between the two components can be made closer.

  Here, the intrinsic viscosity [η] is determined as an orthochlorophenol solution at a temperature of 25 ° C.

  The conjugate multifilament used here has a suitable composite ratio for the low-viscosity polyester component and the high-viscosity polyester component in spinning at least two types of polyester polymers. That is, the composite ratio of the low viscosity polyester component and the high viscosity polyester component is preferably 35 to 65:65 to 35, and more preferably 40 to 60:60 to 40, by weight.

  In the present invention, since the polyester multifilament A has thick details mixed in a single fiber, an irregular change is added to the coiled swivel crimp, and the swirl diameter can be increased or decreased. In addition, since the shrinkage of the thick part and the details is different, the crimped shape can be a more complicated coil turning form. This complex crimped form can give a delicate swell and natural unevenness to the woven or knitted fabric.

  In the present invention, in order to impart high stretchability to the woven or knitted fabric, it is important to maximize the coil crimp of the polyester multifilament A. As a result of intensive studies, the shrinkage of the other polyester multifilament B is brought close to the shrinkage of the polyester multifilament A. That is, the polyester multifilament B has a difference of −5 ≦ boiling water shrinkage (AB: polyester multifilament A It was found that the coil crimping of the polyester multifilament A can be maximized by satisfying (Boiling water shrinkage of the polyester-boiling water shrinkage of the polyester multifilament B) (%) ≦ 5. This is because the composite yarn is crimped while the polyester multifilament A is restrained by the polyester multifilament B in the dyeing process. The expression of crimps occurs almost simultaneously with the shrinkage of the yarn. Therefore, it is very important to shrink the polyester multifilament B in accordance with the shrinkage of the polyester multifilament A. Here, if the difference in boiling water shrinkage (AB) (%)> 5, the polyester multifilament B inhibits the expression of crimp of the polyester multifilament A and the thick part of the multifilament A spontaneously stretches. Since a phenomenon occurs and the sheath turns around, high stretchability cannot be obtained. In addition, if the boiling water shrinkage difference (AB) (%) <-5, the polyester multifilament B has a structure arranged at the core portion, so that the coil crimp of the polyester multifilament A can be utilized. Can not.

  The composite yarn satisfies −5 ≦ boiling water shrinkage difference (A−B) (%) ≦ 5, so that the multifilament A and the multifilament B are alternately exposed on the surface of the yarn, Weaving and knitting can further enhance the natural unevenness. Here, the boiling water shrinkage of the polyester multifilaments A and B is preferably 5 to 25%. If it is less than 5%, the fine difference cannot be emphasized, and a sufficient bulging feeling cannot be obtained. If it exceeds 25%, the shrinkage is too strong, resulting in a hard texture.

  Here, the boiling water shrinkage of the polyester multifilament A is a shrinkage that does not take into account the crimps that have developed.

  Moreover, it is preferable that the polyester multifilament B contains the particle | grains whose average primary particle diameter is 0.02-0.1 micrometer. By containing the particles, the single yarn is easily separated, the phase between the thick and thin single yarns is dispersed in the longitudinal direction of the yarn, the shrinkage difference between the single yarns is generated, the swell is increased, and the natural unevenness is also felt. improves. Further, by separating the single yarns, strong entanglement can be imparted even with low entanglement pressure air, and the occurrence of uneven crimp expression of the polyester multifilament A due to entanglement can be eliminated. Further, by removing the particles in the alkali weight reduction step, it becomes possible to generate microvoids on the yarn surface, and it is possible to improve the color development by suppressing reflected light and the soft feeling by point contact. In addition, the average primary particle diameter in this invention means the value which measured the circumscribed diameter of particle | grains with the particle size analyzer (LA-700) made from HORIBA, and was measured by n number 50.

  Examples of the particles here include colloidal silica. Colloidal silica is a material in which silicon oxide is the main component, and particles present in a single particle form are present as a colloid using water or a monovalent alcohol or diol or a mixture thereof as a dispersion medium.

  In addition, the cross section of the polyester multifilament B can be selected from round, triangular, flat, hexagonal, L-shaped, T-shaped, W-shaped, Yaba-shaped, dog-bone-shaped and other polygonal types, various types, and hollow types. can do.

  Moreover, if the fineness of the polyester multifilaments A and B is in the range of 20 to 250 dtex, respectively, it is possible to impart a feeling of swelling and softness suitable for the eyelash material. More preferably, each fineness is 30 to 180 dtex.

  Further, the single fiber fineness of the polyester multifilaments A and B is preferably 10 dtex or less. When the single fiber fineness exceeds 10 dtex, the soft feeling is insufficient. On the other hand, if the single fiber fineness is too low, the stretchability is lost, and therefore, it is preferably 0.5 dtex or more. A more preferable range of the single fiber fineness is 0.5 to 5.0 dtex.

  Further, the entanglement degree [CF value] per meter of the composite yarn of the present invention is preferably 10 to 120. If it is less than 10, yarn breakage due to single yarn tarmi increases in the twisting or weaving process. If it exceeds 120, the entanglement is too strong, and a part of the multifilament A is crimped, nep is generated in the twisting or weaving process, and the quality of the fabric is deteriorated.

  It is important that the elongation of the composite yarn of the present invention is 30% or more. If the elongation is less than 30%, the orientation of the fiber is high, and it becomes difficult to give a soft texture to the fabric. On the other hand, even if the elongation is too high, problems such as horizontal shrinkage are likely to occur in the weaving process. A more preferable range of elongation is 40 to 60%.

  Moreover, you may add additives, such as a flame retardant, a fluorescent whitening agent, a matting agent, a coloring agent, and an antistatic agent, to the polyester multifilament A or B as needed.

  Further, polyesters having different ionic dye dyeing properties may be used for the polyester multifilament A or B, if necessary. By doing so, it is possible to dye different colors, and it is possible to further improve the multi-color mix effect.

  Next, the manufacturing method of the composite yarn of this invention is demonstrated.

  Polyester multifilament A is obtained by, for example, compounding at least two kinds of polymers or the same kind of polymers having different intrinsic viscosities into, for example, a side-by-side type or an eccentric seascore type to produce an undrawn multifilament a and then drawing. Can do. Polyester multifilament B can also be obtained by drawing after unstretched multifilament b. Here, it is important that the polyester multifilaments A and B have an elongation difference of 80 or less at the unstretched multifilament stage. There is no preferable lower limit of the elongation difference, and even if 0, there is no problem. By satisfying the elongation difference within this range, it becomes possible to satisfy −5 ≦ boiling water shrinkage difference (AB) (%) ≦ 5.

  The spinning speed for obtaining polyester multifilaments A and B (spinning speed of unstretched multifilament a or b) is preferably 1000 to 3000 m / min. If it is less than 1000 m / min, it is difficult to lower the boiling water shrinkage, and the texture becomes hard. On the other hand, since the orientation becomes high at a spinning speed of over 3000 m / min, the dark and light wrinkles become finely cut, making it difficult to obtain a clean surface appearance.

  FIG. 1 is an example of a drawing process diagram of the composite yarn of the present invention. In FIG. 1, 1 indicates an unstretched multifilament a of a polyester multifilament A, and 2 indicates an unstretched multifilament b of a polyester multifilament B. After these two types of unstretched multifilaments are aligned, they are guided to the pinch roller 3 and preheated by the 4 hot roller 4. If the temperature of the hot roller 4 at this time is 40 ° C. to 90 ° C., it is preferable because a uniformly dispersed wrinkle can be formed and a well-balanced thick yarn can be obtained. When the temperature is lower than 40 ° C., the state of wrinkle generation is greatly affected by the fiber converging part, the adhesion spots of the oil agent, and the heat contact in the heating region, and the dispersion state of the wrinkle may be deteriorated. When it exceeds 90 ° C., it becomes close to uniform stretching and it becomes difficult to obtain a wrinkle pattern.

  Thereafter, while heating the yarn with the plate heater 5, the unstretched multifilaments a and b are stretched between 1.7 and 2.5 times between the hot roller 4 and the stepped draw roller 6. Thereby, a thick yarn satisfying 1.5 ≦ U% (%) ≦ 10 can be obtained. Here, cocoon stretching refers to stretching at a magnification not exceeding the natural stretching ratio.

  Moreover, the temperature of the preferable plate heater 5 is 110 to 150 degreeC. If it is less than 110 ° C., the boiling water shrinkage rate is too high, resulting in a woven or knitted fabric with a hard texture. On the other hand, when the temperature exceeds 150 ° C., the dark and light candy becomes finely cut, and it becomes difficult to obtain a clean surface appearance.

  Thereafter, entanglement is applied by the interlace nozzle 7 to converge the yarn. The entanglement pressure at this time is preferably 0.1 to 0.4 (MPa). If it is less than 0.1 (MPa), unentanglement may occur, which is not preferable. On the other hand, if it exceeds 0.4 (MPa), crimping of the multifilament A is expressed and it is easy to generate tarmi, which is not preferable.

  Finally, the composite yarn 8 is wound up. In addition, the higher the cocoon stretching speed, the higher the productivity, which is preferable. However, when considering the stable stretchability, 200 to 1000 (m / min) is preferable.

  Further, the above is a cocoon stretching method after the unstretched multifilaments are aligned, but any blending method such as stretching the unstretched multifilaments a and b separately and then blending them with an entanglement nozzle may be used. Absent.

In addition, the composite yarn of the present invention is preferably twisted with a twist coefficient of 8,000 or more in order to obtain sufficient stretch and resilience with a woven or knitted fabric. Moreover, in order to maintain a soft and swelled texture, a twist coefficient of 35,000 or less is preferable. However,
Twist factor = T x (fineness) ^1/2
T: Number of twists per meter (turns / m)
Fineness: decitex (dtex) x 0.9
It is.

  In the present invention, the woven fabric and the knitted fabric are collectively referred to as “woven fabric”. When the composite yarn of the present invention is woven or knitted, there is no restriction on the structure or density.

  Furthermore, when a woven or knitted fabric using the composite yarn of the present invention is dyed and finished, there is no restriction on the processing method or processing apparatus, but a relaxed and fully stretched or bulging feeling due to the untwisting effect. In order to take out, it is preferable to perform a liquid flow relaxation process. Further, at the time of intermediate setting, the setting temperature is preferably set to 180 ° C. or higher and 230 ° C. or lower in order to increase the alkali weight loss resistance of the thick portion of the composite yarn. If it exceeds 230 ° C., the thick part may be fused, which is not preferable.

  The alkali weight loss rate is preferably 5 to 35%. If it exceeds 35%, there is a problem of a decrease in strength of the thick portion of the composite yarn. On the other hand, if it is less than 5%, it becomes difficult to give a soft texture to the woven or knitted fabric.

  By using the composite yarn of the present invention to make a woven or knitted fabric, it is possible to obtain a swell, stretchability, soft feeling, resilience, and natural unevenness that exceed high-grade wool that cannot be achieved with conventional polyester yarns.

  When the composite yarn of the present invention is used for warp or weft of a woven fabric, a stretch ratio of 10% or more and 50% or less can be obtained in the used direction, and a comfortable stretch property can be obtained. If it is less than 10%, a comfortable stretch property cannot be obtained, and if it exceeds 50%, warp is generated in the woven fabric.

  The fiber obtained by the present invention is suitably used for women's clothing such as blouses, suits, pants, dresses, coats, black formals, and sports clothing such as jerseys, athletic wear, and ski wear.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each physical property in an Example was measured with the following method.

(1) Boiling water shrinkage The multifilaments A and B are taken out from the composite yarn in 15 cm increments. Yarn samples marked at 10 cm intervals under a load of 0.1 g / dtex are wrapped in gauze and heat treated at 98 ° C. for 30 minutes under no tension. Thereafter, the yarn sample is taken out, air-dried for 24 hours, and again, after fully developing the crimp that has been developed under a load of 0.1 g / dtex, the interval (L) marked before the heat treatment is read, and the following formula Represents the shrinkage rate of the yarns A and B.
Boiling water shrinkage (%) = {(10−L) / 10} × 100
(2) Boiling water shrinkage difference The difference in boiling water shrinkage between the multifilaments A and B is expressed as boiling water shrinkage difference (AB) (%).

(3) Fineness According to JIS L1013 8.3 fineness measurement.

(4) U%
As a measuring device, a commercially available Uster EvenTester (manufactured by Measuring Instruments Industry Co., Ltd.) is used. A measurement slot to be used is selected according to the total fineness of the yarn, the yarn speed is set to 200 m / min, rotation is performed at 12000 rpm with a twisting machine, and measurement is performed by a half-inert test while twisting. U% was measured at an arbitrary 5 points of the measurement sample with one measurement for 2.5 minutes as an average value.

(5) Entanglement degree per meter [CF value]
The degree of entanglement is the number of entangled parts per meter under a tension of 0.1 g / d. A pin is inserted into the non-entangled part under a tension of 0.02 g / d, and 0.1 g / d over 1 m of yarn. The pin is moved up and down in the longitudinal direction of the yarn by the tension of d, and the distance moved with the portion moved without resistance as the unentangled portion is recorded, and the portion where the pin stops is taken as the entangled portion. This operation is repeated 5 times, and the degree of entanglement per meter is calculated from the average value (n = 5) of the distance of the unentangled part.

(6) Elongation It measured based on JIS-L-1013.

(7) Difference in elongation The absolute value of the difference in elongation between the multifilaments A and B is expressed as a difference in elongation (%).

(8) Texture evaluation, surface quality evaluation The texture evaluation of the feeling of swelling, softness, rebound, natural unevenness, and uniformity of surface quality was evaluated by a 10-level evaluation method by 10 experts.
○○: Excellent ○: Good △: Acceptable ×: Impossible

(9) Stretch rate It measured by the elongation rate A method (constant speed elongation method) of JIS L-1096.

(10) Average primary particle diameter The average primary particle diameter was measured at an n number of 50 with a particle size analyzer (LA-700) manufactured by HORIBA.

Examples 1-5
A low-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.47 and a high-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.75 are attached to the side-by-side type at a weight ratio of 50:50. The combined polymer was spun at a spinning speed of 1450 (m / min) to obtain a conjugate unstretched multifilament a having 110 dtex, 12 filaments, and 300% elongation. On the other hand, a polymer made of polyethylene terephthalate containing 1.0% by weight of colloidal silica having an average primary particle size of 0.05 μm was spun at a spinning speed of 1450 (m / min) to obtain 103 dtex, 36 filaments, elongation of 310%. Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

Next, the composite yarn obtained in this manner was subjected to additional twisting with a twisting coefficient (K) = 13000 in the S direction using a double twister twisting machine manufactured by Murata Co., Ltd., and then 70 ° C. × 20 A minute steam twist set was carried out. The obtained twisted yarn was used as a warp and a weft, and a warp density: 160 yarns / 2.54 cm, a weft density: 120 yarns / 2.54 cm, and a flat double woven fabric was prepared. Next, the obtained woven fabric was subjected to a softener scouring treatment according to a conventional method, followed by a liquid flow relaxation treatment, followed by a dryer / intermediate set. Intermediate setting conditions were performed at a temperature of 180 ° C. Thereafter, it was immersed in a 3% aqueous solution of caustic soda, subjected to a 20% alkali weight reduction process, dyed with a commercially available black dye at 135 ° C., then subjected to reduction cleaning (80 ° C., 20 minutes), washed with water and dried. . Finally, a finishing set was performed at 160 ° C.
The resulting woven fabric has microvoids due to colloidal silica removal on the surface, and is excellent in swelling, stretchability, softness, rebound, natural unevenness, stretchability, color development, and good surface quality. there were. The results are shown in Table 1.

Example 6
As supply yarn, a low-viscosity component consisting of 100% polyethylene terephthalate with an intrinsic viscosity of 0.4 and a high-viscosity component consisting of 100% polyethylene terephthalate with an intrinsic viscosity of 0.8 are pasted on a side-by-side mold at a weight ratio of 45:55. The combined polymer was spun at a spinning speed of 2500 (m / min) to obtain a conjugate unstretched multifilament a having 150 dtex, 24 filaments and an elongation of 220%. On the other hand, a polymer made of polyethylene terephthalate containing 2.3% by weight of titanium oxide having an average primary particle size of 0.7 μm was spun at a spinning speed of 2500 (m / min), and 145 dtex, 48 filaments, elongation 208% Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

  A flat double woven fabric was prepared in the same manner as in Example 1 except that the warp density was 130 yarns / 2.54 cm and the weft density was 90 yarns / 2.54 cm. As in Example 1, as a result of evaluating the dyeing process, the resulting woven fabric has microvoids due to titanium oxide falling on the surface, and is swelled, stretchable, soft, repulsive, natural unevenness, The result was excellent in stretchability and good surface quality. The results are shown in Table 1.

Example 7
As a supply yarn, a polymer obtained by bonding a polypropylene terephthalate having an intrinsic viscosity of 0.9 and polyethylene terephthalate having an intrinsic viscosity of 0.4 to a side-by-side mold at a weight ratio of 50:50 was spun at a spinning speed of 1500 (m / min). Thus, a conjugate unstretched multifilament a having 105 dtex, 12 filaments, and elongation of 282% was obtained. On the other hand, a polymer made of polyethylene terephthalate containing 1.0% by weight of colloidal silica having an average primary particle size of 0.05 μm was spun at a spinning speed of 1450 (m / min) to obtain 103 dtex, 36 filaments, elongation of 310%. Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

  As a result of creating and dyeing a woven fabric in the same way as in Example 1 and performing dyeing processing on the obtained composite yarn, the obtained woven fabric has microvoids due to colloidal silica removal on the surface, and is bulging, stretchable, soft It was excellent in feeling, repulsion, natural unevenness, stretchability and color development, and also had good surface quality. The results are shown in Table 1.

Comparative Example 1
A low-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.47 and a high-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.75 are attached to the side-by-side type at a weight ratio of 50:50. The combined polymer was spun at a spinning speed of 1450 (m / min) to obtain a conjugate unstretched multifilament a having 110 dtex, 12 filaments, and 300% elongation. On the other hand, a polymer made of polyethylene terephthalate containing 2.3% by weight of titanium oxide having an average primary particle size of 0.7 μm was spun at a spinning speed of 1450 (m / min), and had 103 dtex, 36 filaments, and elongation of 310%. Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

  As a result of creating and evaluating a woven fabric in the same way as in Example 1 and performing dyeing on the obtained composite yarn, the resulting woven fabric had microvoids due to titanium oxide falling on the surface. The fabric was a plain and poor-looking fabric with little resilience and no unevenness. The results are shown in Table 1.

Comparative Example 2
A composite yarn was obtained in the same manner as in Comparative Example 1 except that the draw ratio was 1.6.
As a result of evaluating the result of creating and dyeing a woven fabric in the same manner as in Example 1 on the obtained composite yarn, the obtained woven fabric does not exhibit crimp, has insufficient stretchability, and shrinks. Was high and did not have a natural sense of unevenness. In addition, weaving occurred during weaving and the surface quality was poor. The results are shown in Table 1.

Comparative Example 3
A low-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.47 and a high-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.75 are attached to the side-by-side type at a weight ratio of 50:50. The combined polymer was spun at a spinning speed of 1450 (m / min) to obtain a conjugate unstretched multifilament a having 110 dtex, 12 filaments, and 300% elongation. On the other hand, a polymer made of polyethylene terephthalate containing 2.3% by weight of titanium oxide having an average primary particle size of 0.7 μm was spun at a spinning speed of 3100 (m / min), and was 106 dtex, 36 filaments, elongation 205%. Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

  As a result of creating and dyeing a woven fabric in the same way as in Example 1, performing the dyeing process on the obtained composite yarn, and evaluating it, the obtained woven fabric was insufficient in stretchability, and the natural unevenness was unsatisfactory. . In addition, the surface of the composite yarn was very fragile due to the frequent occurrence of nep. The results are shown in Table 1.

Comparative Example 4
A low-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.47 and a high-viscosity component made of 100% polyethylene terephthalate having an intrinsic viscosity of 0.75 are attached to the side-by-side type at a weight ratio of 50:50. The combined polymer was spun at a spinning speed of 1450 (m / min) to obtain a conjugate unstretched multifilament a having 110 dtex, 12 filaments, and 300% elongation. On the other hand, a polymer made of polyethylene terephthalate containing 2.3% by weight of titanium oxide having an average primary particle size of 0.7 μm was spun at a spinning speed of 900 (m / min), and had 103 dtex, 36 filaments, and elongation of 393%. Unstretched multifilament b was obtained.

  After aligning the undrawn multifilaments a and b, cocoon drawing and fiber blending were carried out by the production methods shown in Table 1 and FIG. 1 to obtain composite yarns having the composite yarn characteristics shown in Table 1.

  As a result of creating and dyeing a woven fabric in the same way as in Example 1 and performing dyeing processing on the obtained composite yarn, the resulting woven fabric is configured with a coil crimp on the sheath side, so the stretchability is insufficient. It was a woven fabric with little resilience. The results are shown in Table 1.

  The composite yarn of the present invention is particularly suitably used for women's clothing such as blouses, suits, pants, dresses, coats, black formals, and sports clothing such as jerseys, athletic wear, and ski wear.

It is process schematic for demonstrating the manufacturing process of the composite yarn of this invention.

Explanation of symbols

1: Unstretched multifilament a of polyester multifilament A
2: Unstretched multifilament b of polyester multifilament B
3: Pinch roller 4: Hot roller 5: Plate heater 6: Stepped draw roller 7: Interlace nozzle 8: Composite yarn

Claims (6)

This multifilament A is a composite yarn in which at least two kinds of polyester multifilaments A and B are mixed, and the composite yarn satisfies the following characteristics (1) and (2) at the same time and constitutes the composite yarn: Is a thick conjugate multifilament having a crimp expression ability, and the multifilament B is a thick multifilament.
(1) 1.5 ≦ U% (%) ≦ 10
(2) -5 ≦ Boiling water shrinkage difference (AB) (%) ≦ 5   2. The composite yarn according to claim 1, wherein the multifilament B contains particles having an average primary particle diameter of 0.02 to 0.1 μm.   A woven or knitted fabric comprising the composite yarn according to claim 1 or 2.   The knitted or knitted fabric according to claim 3, wherein the surface of the multifilament B has microvoids due to dropping of the particles.   A woven fabric characterized in that the composite yarn according to claim 1 or 2 is used as a warp or weft, and the stretch ratio in the yarn direction using the composite yarn is 10% or more.   A conjugate unstretched multifilament in which at least two component polyester polymers are joined in a side-by-side type or an eccentric seascore type and another polyester-based unstretched multifilament are spun at an elongation difference of 80% or less, and then A method for producing a composite yarn obtained by drawing with a draw ratio of 1.7 to 2.5 times.

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