Composite yarns and fabrics

Abstract

To provide a woven fabric that has good stretch recovery properties while also being quick-drying and having a dry feel, and a composite yarn that can realize such a fabric. [Solution] A composite yarn containing false-twist crimped yarn, wherein a false-twist crimped yarn having torque in the S direction and a false-twist crimped yarn having torque in the Z direction are entangled at a number of entanglements of 100 or more per meter, at least one of the two false-twist crimped yarns contains high-shrinkage polyester fibers, and the proportion of high-shrinkage polyester fibers in the entire composite yarn is 30% by mass or more.

Description

Technical Field

[0001] The present invention relates to a composite yarn and a fabric using the composite yarn.

Background Art

[0002] As described in Patent Documents 1 and 2, composite yarns using polyester false-twist yarns are known. Patent Document 1 discloses a composite yarn in which a false-twist crimped yarn having torque in the S direction and a false-twist crimped yarn having torque in the Z direction are entangled at 1 to 70 pieces / m, and polyester fibers can be used as the fibers constituting the composite yarn. Patent Document 2 discloses mixing a high-shrinkage polyester false-twist yarn and a low-shrinkage polyester fiber. As described in Patent Documents 1 and 2, by using these composite yarns for fabrics, the fabrics become bulky (bulging) and have a soft feeling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, there has been a demand for fabrics that have good elongation recovery properties and are quick-drying and have a dry feeling. However, such fabrics could not be realized with the above composite yarns. For example, regarding quick-drying properties, the above composite yarns and the fabrics using them have water retention due to their bulkiness, and thus cannot be said to have sufficient quick-drying properties. Also, a dry feeling is a tactile feeling of hardness, but the fabrics using the above composite yarns had a soft feeling opposite to the dry feeling.

[0005] Therefore, the present invention aims to provide a woven fabric that has good stretch recovery properties while also being quick-drying and having a dry feel, and a composite yarn that can realize such a woven fabric. [Means for solving the problem]

[0006] The present invention includes embodiments shown below.

[0007] [1] In a composite yarn including false-twist crimped yarn, a false-twist crimped yarn having torque in the S direction and a false-twist crimped yarn having torque in the Z direction are entangled at a number of entanglements of 100 / m or more, at least one of the two false-twist crimped yarns contains a high-shrinkage polyester fiber, the proportion of the high-shrinkage polyester fiber in the entire composite yarn is 30% by mass or more, and the high-shrinkage polyester fiber is Polyethylene terephthalate to Isophthalic acid By copolymerizing them Polyethylene terephthalate A fiber made of a material that is more shrinkable than the aforementioned high-shrinkage polyester Isophthalic acid A composite yarn in which the proportion of is between 5 mol% and 20 mol%.

[0008] [2] A composite yarn according to [1], consisting only of high-shrinkage polyester fibers, or consisting only of high-shrinkage polyester fibers and other polyester fibers. [3] The composite yarn according to [2], wherein the proportion of high-shrinkage polyester fibers in the composite yarn is 100% by mass.

[0009] [ 4 The single filament fineness of the high-shrinkage polyester fiber is 1.3 dtex or more and 4.7 dtex or less, [1] ~[3] any of the following The composite yarn described above.

[0010] [ 5 [1]~[ 4 A composite yarn as described in any of the following:

[0011] [ 6 ][1]~[5 A fabric containing the composite yarn according to any one of

[0012] 7 The fabric is a knitted fabric in which the composite yarn is knitted, 6 the fabric according to <第

[0013]

[0013] <第 8 with a diffusible residual moisture rate of 10% or less, <第 6 or 7 the fabric according to <第

Advantages of the Invention

[0014] <第 The fabric of this embodiment has good elongation recovery properties and also has quick-drying properties and a dry feeling. By using the composite yarn of this embodiment, such a fabric can be realized. <第0头000089>

Mode for Carrying Out the Invention

[0015] <第 The embodiments will be described in detail. Note that the embodiments described below are merely examples, and those appropriately modified without departing from the gist of the present invention are included in the scope of the present invention. <第 <第

[0016] <第 First, the composite yarn of this embodiment will be described. <第 <第

[0017] <第 The composite yarn of this embodiment is obtained by intertwining a false-twist textured yarn having a torque in the S direction and a false-twist textured yarn having a torque in the Z direction. This structure of the composite yarn affects the properties of the composite yarn. For example, since this composite yarn is composed of false-twist textured yarns, it has elongation recovery properties due to its crimpability. Further, since the false-twist textured yarns with torques in two directions are intertwined, the bulk (swelling) of the entire composite yarn is suppressed. <第 <第

[0018] <第 It should be noted that there may be some inaccuracies in the translation due to the specific nature of patent text and the need for more context understanding. The translation attempts to maintain the original text structure and key terms as accurately as possible.​Furthermore, the entanglement of false-twist crimped yarns with torque in two directions reduces the overall torque of the composite yarn. This reduced torque makes the composite yarn less prone to entanglement and less prone to distortion in fabrics using this composite yarn. To minimize the overall torque of the composite yarn, it is preferable that the false-twist crimped yarn with torque in the S direction and the false-twist crimped yarn with torque in the Z direction have the same or very similar torque.

[0019] The torque of the composite yarn as a whole is preferably 30 T / m or less, with 0 T / m being the best. Here, the torque is measured by the following method. First, a yarn of about 70 cm is stretched horizontally, and an initial load of 0.18 mN × indicated decitex is suspended from the center, and the ends are pulled together. The yarn then begins to rotate due to residual torque, but it is held in that state until the initial load comes to a stop, and a twisted yarn is obtained. The number of twists in a 25 cm length of the obtained twisted yarn is measured using a twist detector under a load of 17.64 mN × indicated decitex, and the measured number of twists (T / 25 cm) is multiplied by 4 to obtain the torque (T / m).

[0020] Furthermore, the number of entanglements between the false-twist crimped yarn with torque in the S direction and the false-twist crimped yarn with torque in the Z direction is 100 or more. The number of entanglements is the number measured by the method described in the example below. Because the bulk of the composite yarn is suppressed due to the high number of entanglements, the composite yarn does not retain water easily and dries quickly. In addition, fabrics using this composite yarn have good quick-drying properties, are less prone to pilling and snagging, and have a dry texture without clinging. However, from the viewpoint of processing costs, a number of entanglements of 150 or less is preferable.

[0021] Furthermore, in the composite yarn of this embodiment, at least one of the two types of false-twist crimped yarns with different torque directions contains high-shrinkage polyester fibers. The proportion of high-shrinkage polyester fibers in the entire composite yarn is 30% by mass or more. When analyzing an actual composite yarn and calculating the proportion of high-shrinkage polyester fibers in the entire composite yarn, one should calculate the ratio of the weight of the high-shrinkage polyester fibers in the composite yarn to the total weight of the composite yarn.

[0022] By including 30% or more by mass of high-shrinkage polyester fibers in the composite yarn, the stretch recovery of the composite yarn and the fabric using it is greatly enhanced. Furthermore, because this composite yarn possesses stretch recovery due to the inclusion of 30% or more by mass of high-shrinkage polyester fibers, it is not necessary to increase the crimpiness of the false-twist crimped yarn to achieve stretch recovery, thus reducing the bulk of the composite yarn. As a result, the composite yarn can be made to have low bulk despite possessing stretch recovery, and the fabric using this composite yarn can also be made to have low bulk despite possessing stretch recovery.

[0023] Because composite yarns and fabrics have a low bulk, they do not retain water easily and dry quickly. Furthermore, the low bulk of composite yarns and fabrics makes them less prone to pilling and snagging, and gives them a dry feel.

[0024] Furthermore, the proportion of high-shrinkage polyester fibers in the overall composite yarn affects the properties of the composite yarn, such as its hot water shrinkage rate, stretch recovery rate, and dry strength, and also affects the properties of the fabric made from that composite yarn, such as its elongation and hysteresis.

[0025] A specific example where the proportion of high-shrinkage polyester fibers in the entire composite yarn is 30% by mass or more is when both the false-twist crimped yarn with torque in the S direction and the false-twist crimped yarn with torque in the Z direction consist solely of high-shrinkage polyester fibers, resulting in a total proportion of high-shrinkage polyester fibers of 100% by mass in the entire composite yarn. In this case, the stretch recovery properties of the composite yarn and the fabric using it become particularly good.

[0026] Another specific example is when one of the false-twist crimped yarns, one having torque in the S direction and the other having torque in the Z direction, consists solely of high-shrinkage polyester fibers, while the other consists solely of other polyester fibers (for example, regular polyester fibers described later), and the proportion of high-shrinkage polyester fibers in the entire composite yarn is 30% by mass or more. Alternatively, one or both of the false-twist crimped yarns, one having torque in the S direction and the other having torque in the Z direction, may consist of high-shrinkage polyester fibers and other polyester fibers, and the proportion of high-shrinkage polyester fibers in the entire composite yarn may be 30% by mass or more. In these cases, the texture of the composite yarn and the fabric using it can be adjusted by the type of other polyester fibers combined with the high-shrinkage polyester fibers.

[0027] Furthermore, in all of these specific examples, the composite yarn is made solely of polyester, making it easy to recycle. Similarly, the fabric made solely of this composite yarn is also easily recyclable. However, the composite yarn can also be made of high-shrinkage polyester fibers and synthetic fibers other than polyester (e.g., nylon fibers), with the proportion of high-shrinkage polyester fibers in the total composite yarn being 30% by mass or more.

[0028] The polyester used as the raw material for polyester fibers is preferably one in which terephthalic acid is the main acid component and at least one selected from ethylene glycol, trimethylene glycol, tetramethylene glycol, polypropylene glycol, cyclohexane-1,4-dimethanol, etc., is the main glycol component. Of the glycol components listed here, ethylene glycol is particularly preferred. This polyester is referred to as regular polyester. In addition, regular polyester may optionally contain one or more of the following: matting agents, pore-forming agents, color inhibitors, heat stabilizers, flame retardants, fluorescent whitening agents, colorants, antistatic agents, moisture absorbers, antibacterial agents, etc.

[0029] High-shrinkage polyester, the raw material for high-shrinkage polyester fibers, is obtained by copolymerizing the above-mentioned regular polyester with a third component, thereby giving it greater shrinkage than regular polyester. Examples of third components that can be copolymerized include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, and azelaic acid, as well as diols such as diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, 2,2-bis[4-(2-hydroxyethoxy)phenyl]propane, and 1,4-butanediol. Of the third components listed here, isophthalic acid is particularly preferred.

[0030] The proportion of the third component in the high-shrinkage polyester is preferably 5 mol% to 20 mol%, and more preferably 8 mol% to 12 mol%. Having the proportion of the third component within this range tends to result in good stretch recovery of the composite yarn and the fabric using it.

[0031] From these fibers, multifilament yarns, specifically semi-oriented yarn or drawn yarn, are produced. Semi-oriented yarn is also called POY (Partial Oriented Yarn), and drawn yarn is also called SDY (Spin Draw Yarn).

[0032] Furthermore, semi-drawn or drawn yarn is subjected to a false-twist process to become false-twist crimped yarn. False-twist crimped yarn is also called DTY (Draw Textured Yarn). In the false-twist process, the yarn is twisted, and then the yarn is heated to untwist it, thereby imparting crimp properties to the yarn. There are no limitations on the conditions such as the draw ratio, number of false twists, temperature, and yarn speed during the false-twist process.

[0033] Incidentally, friction type and pin type false twisting machines are known. Compared to the pin type, the friction type can process at high speed, and the resulting false twist crimped yarn has less bulk and lower elasticity. When false twist crimped yarn is produced by false twisting using a friction type and a pin type, respectively, with the same single yarn fineness, total fineness, and material, there is a significant difference in bulk and elasticity between the two. Therefore, it is possible to determine from the finished false twist crimped yarn whether it was processed using a friction type or a pin type false twisting machine. In this embodiment, false twisting is preferably performed using a friction type machine. As a result, the composite yarn and the fabric using it have better quick-drying properties and are less prone to pilling and snagging. However, false twisting in this embodiment may also be performed using a pin type machine. False twist crimped yarn processed using a friction type machine will be referred to as friction type false twisted yarn.

[0034] By applying a twist in the S direction during the false twisting process, a false twist crimped yarn with torque in the S direction is completed. Furthermore, by applying a twist in the Z direction during the false twisting process, a false twist crimped yarn with torque in the Z direction is completed.

[0035] The total fineness of the false-twist crimped yarn made of high-shrinkage polyester is preferably 33 dtex to 56 dtex. Furthermore, the single-fiber fineness of the high-shrinkage polyester fiber is preferably 1.3 dtex to 4.7 dtex. If the single-fiber fineness is too low, the fabric will not feel dry, but a single-fiber fineness of 1.3 dtex or higher makes it easier for the fabric to feel dry. Also, if the single-fiber fineness is too high, the torque of the false-twist crimped yarn will be too high, but a single-fiber fineness of 4.7 dtex or lower prevents this. These finenesses also affect the properties of the composite yarn, such as its stretch recovery rate and dry strength, and consequently, the properties of the fabric using that composite yarn, such as its elongation and hysteresis.

[0036] As described above, a false-twist crimped yarn having torque in the S direction and a false-twist crimped yarn having torque in the Z direction are intertwined to form a composite yarn. As for the intertwining method, the interlacing method, which is a type of fluid intertwining method, is preferred.

[0037] The composite yarn of this embodiment has high stretch recovery strength. The stretch recovery strength of the composite yarn (at the 5th stretch and recovery) is preferably 3.0 mN to 4.5 mN. Note that the stretch recovery strength (at the 5th stretch and recovery) is the average value of the force at the 5th stretch and recovery when the yarn is stretched and recovered 5 or more times. By having a stretch recovery strength (at the 5th stretch and recovery) of 3.0 mN to 4.5 mN, the composite yarn and the fabric using it will stretch sufficiently and recover firmly after stretching. Furthermore, the stretch recovery strength (at the 11th stretch and recovery) of the composite yarn of this embodiment is preferably 1.5 mN to 2.5 mN. The stretch recovery strength (at the 11th stretch and recovery) is the average value of the force at the 11th stretch and recovery when the yarn is stretched and recovered 11 or more times. An accurate method for measuring stretch recovery strength will be described later.

[0038] Furthermore, the composite yarn of this embodiment preferably has a stretch recovery rate (CR value) of 25% or more and 40% or less. The stretch recovery rate is the ratio of the skein length after removing a portion of the load after immersion in water for a predetermined time under a predetermined load applied to a small skein made from the composite yarn, to the skein length after a predetermined load has been applied to the skein, and is a value obtained by the method of the embodiment described later. A stretch recovery rate of 25% or more ensures that the composite yarn and the fabric using it stretch sufficiently and then recover firmly. In addition, for crimpable yarns, the relationship holds that the higher the crimp and the bulkier the yarn, the greater the stretch recovery rate. If the composite yarn of this embodiment has a crimp that results in a stretch recovery rate of 40% or less, the fabric using this composite yarn will not be bulky, making it easier to achieve quick-drying properties and a dry feel, and pilling and snagging are less likely to occur because the crimp of the composite yarn is suppressed.

[0039] Generally, crimpable yarns have a stretch recovery rate exceeding 50%, and the greater the stretch recovery rate, the greater the elongation recovery force. However, the composite yarn of this embodiment exhibits high elongation recovery force despite having a relatively low stretch recovery rate. This is due to the presence of a predetermined or higher proportion of high-shrinkage polyester fibers in the composite yarn.

[0040] Furthermore, the composite yarn of this embodiment preferably has a hot water shrinkage rate of 8% or more. The hot water shrinkage rate is the rate of change in length due to immersion of the composite yarn in hot water, and is a value obtained by the method of the embodiment described later. In general, false-twist crimped yarn has an extremely small hot water shrinkage rate because it is heated during the false-twisting process. However, the composite yarn of this embodiment has a large hot water shrinkage rate despite the false-twist crimped yarn being heated during the false-twisting process. This characteristic is due to the fact that the composite yarn contains 30% by mass or more of high-shrinkage polyester fibers.

[0041] Furthermore, the composite yarn of this embodiment preferably has a dry strength of 4.0 cN / dtex or higher. Dry strength is the value obtained by dividing the strength at which the yarn breaks in a tensile test by the total fineness, and is a value that can be determined by the method of the embodiment described later.

[0042] Next, the fabric of this embodiment will be described. The fabric of this embodiment consists only of the composite yarn of this embodiment, or of the composite yarn of this embodiment and another yarn. In order for the fabric to have the characteristics described below, it is preferable that the fabric consists only of the composite yarn of this embodiment.

[0043] Furthermore, examples of fabrics in this embodiment include knitted fabrics and woven fabrics, and examples of knitted fabrics include circular knitted fabrics, weft knitted fabrics other than circular knitted fabrics, and warp knitted fabrics. Among these, knitted fabrics are preferred as fabrics in this embodiment, and circular knitted fabrics are particularly preferred among knitted fabrics.

[0044] In this embodiment, when the fabric is knitted, the preferred density is a CPI (courses per inch, i.e., the number of stitches per inch in the warp direction) of 50 to 90 and a WPI (wale per inch, i.e., the number of stitches per inch in the weft direction) of 40 to 70. Density affects the shrinkage rate, water retention rate, and feel of the fabric, but in this embodiment, the density within this range allows the characteristics of the composite yarn of this embodiment to be utilized, resulting in a knitted fabric with excellent stretch recovery, quick-drying properties, and a dry feel.

[0045] Furthermore, the weight of the fabric in this embodiment is 100g / m². 2 More than 250g / m 2 The following is preferable: a basis weight of 100g / m². 2 As a result, the dryness is more easily perceived, and the basis weight is 250g / m 2 The following factors result in particularly good quick-drying properties. Especially when the fabric is intended for sportswear, a weight within this range is preferable.

[0046] Furthermore, the fabric of this embodiment preferably has a diffusible residual moisture content of 10% or less. The diffusible residual moisture content is a value measured by the method described in the examples below. If the diffusible residual moisture content is 10% or less, the fabric can be said to have good quick-drying properties.

[0047] Furthermore, it is preferable that the elongation of the fabric of this embodiment under a 14.7N load is 40% to 70% in the vertical direction and 100% to 170% in the horizontal direction. Also, it is preferable that the hysteresis of the fabric of this embodiment is 35% to 60% in both the vertical and horizontal directions. The elongation and hysteresis values ​​here are determined by the method described in the embodiment below. If the elongation and hysteresis of the fabric are within this range, garments made from this fabric will have optimal stretch recovery and optimal comfort.

[0048] The density, basis weight, diffusible residual moisture content, elongation, and hysteresis described herein are properties of knitted fabrics, but other types of fabrics may also possess these properties.

[0049] As described above, the fabric of this embodiment has excellent stretch recovery, quick-drying properties, and a dry feel. Fabrics with such characteristics can be used for clothing, bedding, surface materials, etc. This fabric can be realized by using the composite yarn of this embodiment.

[0050] Next, examples and comparative examples will be described. In the examples and comparative examples, the characteristics were investigated by the following method.

[0051] (1) Characteristics of the yarn (1-1) Dry Strong A tensile test was conducted in accordance with JIS-L-1015, and the strength (cN) at which the yarn broke was measured. This strength (cN) was divided by the total fineness (dtex) to obtain the dry strength.

[0052] (1-2) Elongation at break In accordance with JIS-L-1013, the yarn was stretched under the conditions of a sample yarn length of 200 mm and a constant tensile speed of 200 mm / min. The elongation at the time of breakage was defined as the elongation at break (%). Three measurements were taken, and the average value was calculated.

[0053] (1-3) Hydrothermal contraction The rate of change in length due to immersion of composite yarn in hot water was determined in accordance with Method B of JIS-L-1013.

[0054] (1-4) Stretch recovery rate The ratio of the skein length after removing a portion of the load following immersion to the skein length after immersion, when a predetermined load has been applied to a small skein made from composite yarn and immersed in water for a predetermined time, was determined as the stretch recovery rate in accordance with JIS-L-1013.

[0055] (1-5) Confounding number The degree of confounding measured in accordance with JIS-L-1013 was defined as the confounding number.

[0056] (1-6) Elongation recovery The composite yarn was repeatedly stretched and recovered according to Method A of JIS-L-1013. The average value of the stretching force at 30% stretch during the 5th stretch and the recovery force at 30% stretch during the 5th recovery was defined as the stretch recovery force (5th stretch recovery). In addition, the average value of the stretching force at 30% stretch during the 11th stretch and the recovery force at 30% stretch during the 11th recovery was defined as the stretch recovery force (11th stretch recovery).

[0057] (2) Characteristics of fabrics (2-1) Swelling Five individuals, all involved in fabric development and skilled in fabric evaluation, evaluated the fabrics based on their tactile sensation. Lower ratings were given to fabrics that felt bulky or fluffy. The ratings were assigned from best to worst: ◎, ○, △, ×.

[0058] (2-2) Dryness Five individuals, all involved in fabric development and skilled in fabric evaluation, evaluated the fabrics based on their tactile sensation. Higher ratings were given to fabrics that felt drier or firmer. The ratings were assigned from highest to lowest: ◎, ○, △, and ×.

[0059] (2-3) Elongation under a load of 14.7N The elongation in the longitudinal and transverse directions under a load of 14.7 N was determined using the constant-speed elongation method (Method A, elongation rate) specified in JIS-L-1096.

[0060] (2-4) Hysteresis The circular knitted fabric was stretched by 60%, then the load was removed and it was allowed to recover. This process was repeated three times, and the load at 30% stretch (30% stretching force) and the load at 30% recovery (30% tensioning force) were read from the SS curve of the third measurement. Hysteresis was then calculated using the following formula. For details, follow the method for determining stretching force (Method B) in JIS-L-1096. Hysteresis (%) = {(30% stretching force - 30% tensioning force) ÷ 30% stretching force} × 100 (2-5) Diffusible residual moisture content Under conditions of 20°C and 65% relative humidity, water was dropped onto a fabric sample. Approximately 0.6 cc of water was added to the fabric, and the amount of water present in the fabric immediately after dropping (g) and after 55 minutes (g) was measured. The diffusible residual moisture content (%) was then calculated using the following formula. Details are in accordance with ISO 17617. Diffusible residual moisture content (%) = (Moisture content after 55 minutes / Moisture content immediately after dropping) × 100 (2-6) Snuggling A snug test was conducted according to the D-3 method of JIS-L-1058 to determine the class. A higher class indicates less snug occurrence.

[0061] <Example 1> Yarn A, as described in Table 1, was prepared. Yarn A is a 33dtex12 filament SDY made of high-shrinkage polyester copolymerized with polyethylene terephthalate and isophthalic acid as the third component. Yarn A was false-twisted using a friction-type false-twisting machine to obtain false-twist crimped yarn with torque in the S direction and false-twist crimped yarn with torque in the Z direction. Next, these two types of false-twist crimped yarns were interlaced using an interlacer to produce a composite yarn of 100% high-shrinkage polyester with 66dtex24 filaments. The number of interlaces of the two types of false-twist crimped yarns was 115 / m.

[0062] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a smooth knitted fabric was produced using a 28-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0063] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are shown in Table 2.

[0064] <Example 2> Similar to Example 1, a false-twist crimped yarn with torque in the Z direction was obtained from yarn A, which is made of high-shrinkage polyester. In addition, yarn C (POY of 56 dtex 36 filaments made of polyethylene terephthalate, a regular polyester) as described in Table 1 was stretched to 33 dtex and false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the S direction. Next, these two types of false-twist crimped yarns were interlaced using an interlacer to create a composite yarn of 66 dtex 48 filaments. The proportion of high-shrinkage polyester fibers in the entire composite yarn was 50%, with 33 dtex out of 66 dtex. The number of interlaces of the two types of false-twist crimped yarns was 110 filaments / m.

[0065] Next, two types of circular knitted fabrics were obtained using this composite yarn, similar to Example 1.

[0066] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are shown in Table 2.

[0067] <Example 3> A false-twist crimped yarn with torque in the Z direction was obtained from yarn B (SDY of 56 dtex 12 filaments, consisting of a high-shrinkage polyester copolymerized with isophthalic acid as a third component, polyethylene terephthalate) as described in Table 1. Similarly to Example 2, yarn C, made of regular polyester, was stretched to 33 dtex and false-twisted to obtain a false-twist crimped yarn with torque in the S direction. Next, these two types of false-twist crimped yarns were interlaced to form a composite yarn of 89 dtex 48 filaments. The proportion of high-shrinkage polyester fibers in the entire composite yarn was 62.9% (56 dtex out of 89 dtex). The number of intertwined fibers in the two types of false-twist crimped yarns was 107 / m.

[0068] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a moss knitted fabric was produced using a 32-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0069] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are shown in Table 2.

[0070] <Example 4> Similar to Example 1, a false-twist crimped yarn with torque in the Z direction was obtained from yarn A, which is made of high-shrinkage polyester. In addition, yarn C, which is made of regular polyester, was false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the S direction. Next, these two types of false-twist crimped yarns were interlaced with an interlacer to form a composite yarn of 89 dtex 48 filaments. The proportion of high-shrinkage polyester fibers in the entire composite yarn was 33 dtex out of 89 dtex, or 37.1%. The number of interlaces of the two types of false-twist crimped yarns was 110 filaments / m.

[0071] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a honeycomb knitted fabric was produced using a 28-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0072] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are shown in Table 2.

[0073] <Comparative Example 1> Yarn B, made of high-shrinkage polyester, was false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the Z direction. Yarn C, made of regular polyester, was also false-twisted and stretched to 33 dtex using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the S direction. Next, these two types of false-twist crimped yarns were interlaced to form a composite yarn of 89 dtex and 48 filaments. The proportion of high-shrinkage polyester fibers in the entire composite yarn was 56 dtex out of 89 dtex, or 62.9%. The number of interlaces between the two types of false-twist crimped yarns was 90 filaments / m.

[0074] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a rib knitted fabric was produced using a 24-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0075] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are as shown in Table 3.

[0076] <Comparative Example 2> Yarn A, made of high-shrinkage polyester, was false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the Z direction. Yarn D (POY of 89dtex36 filaments made of polyethylene terephthalate, a regular polyester) as described in Table 1 was false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the S direction. Next, these two types of false-twist crimped yarns were interlaced using an interlacer to create a composite yarn of 122dtex48 filaments. The proportion of high-shrinkage polyester fibers in the entire composite yarn was 27.0%. The number of interlaces in the two types of false-twist crimped yarns was 110 per meter.

[0077] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a mesh knitted fabric was produced using a 28-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0078] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are as shown in Table 3.

[0079] <Comparative Example 3> A yarn of 84dtex36 filament made of polyethylene terephthalate, a regular polyester, was false-twisted using a pin-type false-twisting machine to obtain a false-twisted crimped yarn with torque in the Z direction.

[0080] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and a smooth knitted fabric was produced using a 28-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0081] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are as shown in Table 3.

[0082] <Comparative Example 4> A yarn of 84dtex36 filament made of polyethylene terephthalate, a regular polyester, was false-twisted using a friction-type false-twisting machine to obtain a false-twist crimped yarn with torque in the Z direction. Next, in order to prevent the regular polyester fibers constituting this false-twist crimped yarn from unraveling, this false-twist crimped yarn was passed through an interlacer to entangle the regular polyester fibers, and this yarn was used to investigate its properties.

[0083] Next, circular knitted fabrics were produced using this composite yarn. A jersey knitted fabric was produced using a 36-gauge circular knitting machine, and another jersey knitted fabric was produced using a 28-gauge circular knitting machine. The produced circular knitted fabrics were then heat-set, dyed, and final-set to create samples for examining their properties.

[0084] The characteristics of the composite yarn and the circular knitted fabric (woven fabric) are as shown in Table 3.

[0085] [Table 1]

[0086] [Table 2]

[0087] [Table 3]

Claims

1. In a composite yarn including a false-twist crimped yarn, A false-twist crimped yarn having torque in the S direction and a false-twist crimped yarn having torque in the Z direction are entangled at a number of entanglements of 100 or more per meter. At least one of the two false-twist crimped yarns contains a high-shrinkage polyester fiber. The proportion of high-shrinkage polyester fibers in the entire composite yarn is 30% by mass or more. The aforementioned high-shrinkage polyester fiber is a fiber made by copolymerizing polyethylene terephthalate with isophthalic acid to give it greater shrinkage than polyethylene terephthalate. The proportion of isophthalic acid in the aforementioned high-shrinkage polyester is 5 mol% or more and 20 mol% or less. Composite yarn.

2. The composite yarn according to claim 1, comprising only high-shrinkage polyester fibers, or comprising only high-shrinkage polyester fibers and other polyester fibers.

3. The composite yarn according to claim 2, wherein the proportion of high-shrinkage polyester fibers in the composite yarn is 100% by mass.

4. The composite yarn according to claim 1 or 2, wherein the single filament fineness of the high-shrinkage polyester fiber is 1.3 dtex or more and 4.7 dtex or less.

5. The composite yarn according to claim 1 or 2, wherein the stretch recovery rate is 25% or more and 40% or less, the elongation recovery power (at the 5th elongation recovery) is 3.0 mN or more and 4.5 mN or less, and the hydrothermal shrinkage rate is 8% or more.

6. A fabric containing the composite yarn described in claim 1.

7. The fabric according to claim 6, wherein the fabric is a knitted fabric made from the composite yarn.

8. The fabric according to claim 6, wherein the diffusible residual moisture content is 10% or less.

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