Elastic warp knitted fabrics and garments

Abstract

To provide an elastic warp knitted fabric which is knitted from elastic fibers and inelastic fibers and follows a body movement even during high-speed exercise.SOLUTION: There is provided an elastic warp knitted fabric which is knitted from elastic fibers and inelastic fibers, wherein the elastic fibers are made of a polyurethane elastomer whose polyol component is a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran. The elastic fibers are knitted in a double stitch structure. The CF index of the elastic fiber satisfies the following formula (Formula 1):√d / Ls≤10.0...(Formula 1) (where d is the total fineness of the elastic fiber and Ls is the sinker loop length per course of the elastic fiber). The elastic warp knitted fabric has a hysteresis loss rate of 40% or less in the weft direction at 100% elongation of the knitted fabric.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to elastic warp knit fabrics and garments. [Background technology]

[0002] In recent years, there has been a demand for clothing that has the function of assisting the body's movements during intense exercise and the motion support function of reducing muscle fatigue, and there has been an increasing demand for elastic knitted fabrics to be used in such clothing. Such clothing has a good fit when worn and can appropriately support the body's muscles by following the movement of the body even during high-speed exercise, contributing to improved athletic function.

[0003] For example, Patent Document 1 proposes a knitted fabric that improves movement tracking in the warp direction of the knitted fabric by controlling the direction of sinker loops of elastic fibers that have excellent stretch recovery properties through the knitting structure. Also, Patent Document 2 proposes a knitted fabric that uses elastic fibers and has excellent stretch balance and stretch recovery properties in the warp and weft directions of the knitted fabric. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2019-528385 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-189815 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the knitting structure is specialized for movement following ability in the warp direction of the knitted fabric, so there is room for improvement in movement following ability and stretch recovery characteristics in the weft direction of the knitted fabric.

[0006] Although Patent Document 2 has excellent stretch recovery properties in the warp and weft directions, it does not consider movement tracking during high-speed stretching exercise. Therefore, when applied to sportswear that involves high-speed exercise, such as sprinting, it is thought that sagging occurs in the fabric during exercise, reducing the muscle support function.

[0007] Therefore, the present invention relates to an elastic warp knitted fabric knitted from elastic fibers and inelastic fibers, and an object of the present invention is to provide an elastic warp knitted fabric and clothing that can follow the movement of the body even during high-speed exercise. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention has the following configuration.

[0009] (1) An elastic warp knitted fabric knitted from elastic fibers and non-elastic fibers, wherein the elastic fibers are made of a polyurethane elastomer in which the polyol component is a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran, the elastic fibers are knitted in a double-knit structure, and the CF index of the elastic fibers satisfies the following formula (Formula 1): √d / L s ≦10.0 (Formula 1) (where d is the total fineness of the elastic fiber, L s is the sinker loop length per course of elastic fiber) The elastic warp knitted fabric has a hysteresis loss rate of 40% or less in the weft direction when stretched 100%.

[0010] (2) The elastic warp knitted fabric is made cylindrical in both the warp and weft directions, and the cylindrical sample is attached to a DeMascher fatigue tester with a diameter of 10 cm and a height of 10 cm. The effective projected area is 105 cm. 2 After stretching the fabric by 5% in the height direction, the average sagging area of the fabric in the warp and weft directions was 0.8 cm when the fabric was repeatedly stretched by 50% in the height direction at a stretch rate of 3 times / second. 2 The elastic warp knitted fabric according to (1) below.

[0011] (3) The elastic warp knitted fabric according to (1) or (2), wherein the elastic fibers have a total fineness of 30 to 120 dtex.

[0012] (4) The elastic warp knitted fabric according to any one of (1) to (3), wherein the non-elastic fiber is a false twist crimped yarn.

[0013] (5) The elastic warp knitted fabric according to any one of claims (1) to (4), wherein the inelastic fiber is a polyamide fiber.

[0014] (6) The elastic warp knitted fabric according to any one of (1) to (5), wherein the non-elastic fibers have a total fineness of 40 to 100 dtex.

[0015] (7) An elastic warp knitted fabric according to any one of (1) to (6), which has a burst strength of 350 kPa or more.

[0016] (8) A garment at least partly comprising the elastic warp knitted fabric according to any one of (1) to (7). [Effects of the Invention]

[0017] In the present invention, by optimizing the knitting structure of elastic fibers with excellent stretch recovery properties and implementing a knitting design that maintains the same properties of the elastic fibers, it is possible to reduce the hysteresis loss rate in the weft direction of the knitting fabric, thereby providing an elastic warp knitted fabric that has excellent movement followability and follows the movement of the body even during high-speed exercise.By using the elastic warp knitted fabric of the present invention, it is possible to obtain movement followability during high-speed exercise, suppress the decrease in muscle support function caused by sagging clothing during exercise, and improve performance by suppressing muscle vibration. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram for explaining the sinker loop length per course of elastic fiber. [Figure 2] FIG. 10 is a schematic diagram for explaining a sagging area of fabric. [Figure 3]1 is a diagram showing the knitting structure of inelastic fibers and elastic fibers in Example 1 and Comparative Example 5. FIG. [Figure 4] 1 is a diagram showing the knitting structure of inelastic fibers and elastic fibers in Example 2. FIG. [Figure 5] 1 is a diagram showing the knitting structure of inelastic fibers and elastic fibers in Example 3 and Comparative Examples 1 to 3. FIG. [Figure 6] 10 is a diagram showing the knitting structure of inelastic fibers and elastic fibers in Comparative Example 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be described in detail below. The elastic warp knitted fabric according to the present invention is a warp knitted fabric knitted from elastic fibers and non-elastic fibers. That is, it is knitted using at least two reeds, with elastic fibers arranged in at least one reed and non-elastic fibers arranged in the other reed.

[0020] In the present invention, the knitted structure of the elastic fiber is a double-knit structure. A double-knit structure is a structure in which one warp thread forms two knitted loops (needle loops) in the same course, which allows for a higher blending rate of elastic fiber compared to other structures, and also forms sinker loops in the weft direction of the knitted fabric between the needle loops. Therefore, by using a double-knit structure for the elastic fiber and an elastic fiber with high stress during recovery, as described below, it is possible to reduce the hysteresis loss rate during elongation and recovery in the weft direction of the knitted fabric and obtain a knitted fabric with excellent followability during high-speed stretching and contracting motion.

[0021] The double-knit structure may be a structure in which the elastic fiber forms closed loops in all courses, or a structure in which the elastic fiber forms open loops in all courses, but it is preferable to select closed loops that moderately constrain the knitted fabric and have high stretch-back properties.

[0022] In the elastic warp knitted fabric of the present invention, it is preferred that the elastic fibers are threaded in a full set to form knitted loops. By threading the elastic fibers in a full set, the elastic fibers are evenly distributed in the knitted fabric and their positions are stabilized, which is preferable because it is possible to prevent the shape from being distorted or the surface quality from deteriorating when the fabric is worn as clothing.

[0023] The knitting structure of the inelastic fibers is not particularly limited, and various structures such as a Denbigh structure, a cord structure, and an atlas structure can be selected. Furthermore, it is preferable that the inelastic fibers are threaded in a full set to form knitted loops. By threading the inelastic fibers in a full set, a decrease in the strength of the knitted fabric can be suppressed.

[0024] In the elastic warp knitted fabric of the present invention, the knitted structure of the elastic fiber and the knitted structure of the inelastic fiber may be underlapped in the same direction between the same courses, or may be underlapped in different directions. When the underlapped structure is in the same direction and the elastic fiber is arranged on the back reed, the elastic fiber is exposed on the surface of the knitted fabric at the sinker surface where the sinker loop is exposed on the surface, and the high frictional force of the elastic fiber increases the friction of the surface. Therefore, for example, when the elastic warp knitted fabric of the present invention is applied to clothing so that the sinker surface faces the skin, slippage between the skin and the clothing is suppressed, and the clothing can be prevented from sliding up or down. On the other hand, when the underlapped structure is in different directions, the elastic fiber is not exposed on the surface of the knitted fabric as in general warp knitted fabrics, and a smooth feel can be obtained, so the underlapped structure can be selected appropriately depending on the intended use.

[0025] The warp knitting machine used to knit the elastic warp knitted fabric of the present invention is not particularly limited and may be either a single tricot machine or a single Raschel machine. However, in consideration of good production efficiency and the wide variety of knitting machine gauges available for easy selection, it is more preferable to use a single tricot machine.

[0026] In the case of a single tricot machine, two to four reeds are usually used, but as the number of reeds increases, production efficiency decreases and the basis weight increases. For this reason, it is preferable to select a knitted fabric structure with two reeds.

[0027] The reeds used during knitting are referred to as follows: when standing in front of the knitting machine, the reed furthest from the front is called the front reed, the reed furthest from the back is called the back reed, and the reed in between them is called the middle reed. When two reeds, i.e., a front reed and a back reed, are used, the combination of reeds and fibers is not particularly limited, but it is preferable to use a non-elastic fiber in the front reed and an elastic fiber in the back reed. When an elastic fiber is used in the back reed, it is easier for the elastic fiber to be placed in the middle layer of the knitted fabric, which is preferable as it can overcome the drawbacks specific to elastic fibers, such as poor dyeability.

[0028] The elastic fiber used in the present invention is a polyurethane elastic fiber made of a polyurethane elastomer in which the polyol component is a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran. The use of a polyurethane elastic fiber of this configuration improves stress during recovery and reduces the hysteresis loss rate of the elastic warp knitted fabric compared to polyurethane elastic fibers of other configurations, and the same properties can be maintained even during high-speed stretching and contracting movements.

[0029] The polyurethane segments of the polyurethane polymer used in the polyurethane elastic fiber that can be used in the present invention are composed of soft segments such as long-chain polyether segments, polyester segments, or polyetherester segments, and hard segments that are relatively short-chain segments obtained by the reaction of isocyanate with a chain extender such as a diamine or diol.

[0030] As the soft segment of such a polyurethane polymer, that is, the polyol component, a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran is used from the viewpoint of obtaining excellent stretching properties and reducing resistance during elongation.

[0031] The polyurethane polymer can be obtained by chain extending a prepolymer product obtained by polyaddition reaction (capping reaction) of a hydroxyl-terminated soft segment precursor with an organic diisocyanate using an amine chain extender or a diol chain extender.

[0032] Examples of organic diisocyanates that can be used for the polyurethane polymer include bis-(p-isocyanatophenyl)-methane (hereinafter abbreviated as MDI), tolylene diisocyanate (hereinafter abbreviated as TDI), bis-(4-isocyanatocyclohexyl)-methane (hereinafter abbreviated as PICM), hexamethylene diisocyanate, and 3,3,5-trimethyl-5-methylenecyclohexyl diisocyanate, with MDI being preferred.

[0033] As the chain extender, an amine chain extender is preferably used, and for example, diamines such as ethylenediamine, 1,3-cyclohexanediamine, and 1,4-cyclohexanediamine are preferably used to form polyurethaneurea.

[0034] The amine chain extender is not limited to a single diamine, but may be composed of multiple amines. A chain terminator can be included in the reaction mixture to help control the final molecular weight of the polyurethaneurea. Typically, a monofunctional compound with an active hydrogen, such as diethylamine, can be used as the chain terminator.

[0035] The chain extender is not limited to the above amines but may also be a diol. Examples include ethylene glycol, 1,3-propanediol, 4-butanediol, neopentyl glycol, 1,2-propylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, 1,4-bis(β-hydroxyethoxy)benzene, bis(β-hydroxyethyl)terephthalate, and paraxylylenediol. The diol chain extender is not limited to a single diol but may be composed of multiple diols. It may also be used in combination with a compound containing one hydroxyl group that reacts with an isocyanate group. In this case, various methods, such as melt polymerization and solution polymerization, can be used to obtain such polyurethanes, and are not limited to these. The polymerization recipe is also not particularly limited. For example, a method of synthesizing polyurethane by simultaneously reacting a polyol, a diisocyanate, and a chain extender composed of a diol may be used. Any method may be used.

[0036] Furthermore, it is also preferable to add other stabilizers to the extent that the effects of the present invention are not impaired.

[0037] When preparing a solution of the polyurethane polymer, N,N-dimethylacetamide (hereinafter abbreviated as DMAc), dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, etc. can be used as the solvent, but DMAc is the most commonly used solvent.

[0038] The solution concentration of the polyurethane polymer is not particularly limited, but is usually preferably 30% to 40% (based on the total weight of the solution), and particularly preferably 35% to 38% in the case of dry spinning.

[0039] In the present invention, the method for spinning polyurethane elastic fibers from polyurethane polymers is not particularly limited. For example, 1) in the case of polyurethane elastic fibers using a diol as a chain extender, it is preferable to employ a melt spinning method, a dry spinning method, or a wet spinning method, and 2) in the case of polyurethane elastic fibers using an amine as a chain extender, it is usually preferable to employ a dry spinning method.

[0040] During spinning, in order to reduce friction between the yarn and the guides of the spinning machine or to prevent static electricity buildup, it is also preferable to apply an oil such as dimethyl silicone, a silicone oil such as a modified silicone in which some of the methyl groups of dimethyl silicone have been substituted with other alkyl groups, phenyl groups, amino groups, or the like, or a mineral oil to the yarn, although no oil may be applied. The cross-sectional shape of the resulting elastic fiber may be circular or flat.

[0041] The fineness of the elastic fiber is preferably 30 to 120 dtex, and more preferably 30 to 90 dtex, which allows for both a low basis weight and excellent stretch recovery properties, making it suitable for use in sportswear and compression wear.

[0042] The inelastic fiber used in the present invention may be a spun yarn or a multifilament yarn, but is preferably a multifilament yarn in order to ensure the strength, such as burst strength, required for sportswear and compression wear.

[0043] Examples of inelastic fibers include natural fibers such as cotton, silk, and animal fibers (wool); aromatic polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate; aromatic polyester fibers copolymerized with a third component; aliphatic polyester fibers such as polylactic acid, primarily composed of L-lactic acid; polyamide fibers such as nylon 6, nylon 66, and nylon 56; and synthetic fibers such as polypropylene fibers; semi-synthetic fibers such as acetate; and regenerated cellulose fibers. Among these, polyester fibers or polyamide fibers are preferred because of their quick-drying properties and strength, which are required for sportswear and compression wear. Furthermore, polyamide fibers are particularly preferred because of their even greater strength.

[0044] In general, polyester fibers are dyed with disperse dyes, but when polyurethane elastic fibers are used as the elastic fibers, the disperse dyes contaminate the polyurethane fibers, which can cause poor fastness in the final product, such as color transfer. Therefore, when polyester fibers are used as the non-elastic fibers, it is more preferable to use cationic dyeable polyester fibers that can be dyed with cationic dyes.

[0045] In the case of non-elastic fibers, various additives may be contained in the polymer, such as inorganic substances such as titanium oxide, silica, and barium oxide, colorants such as carbon black, dyes, and pigments, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers.

[0046] The cross-sectional shape of inelastic fibers can be a perfect circle, a flat cross section with a ratio of the short axis to the long axis (flatness) of greater than 1.0, a polygonal cross section such as a triangle, square, hexagon, or octagon, a daruma cross section with some unevenness, a Y-shaped cross section, a star-shaped cross section, and so on.

[0047] There are no particular limitations on the form of the non-elastic fiber, and it may be in the form of drawn yarn, air-textured yarn, false-twisted crimped yarn, twisted yarn, covered yarn, or the like, but false-twisted crimped yarn is particularly preferred. False-twisted crimping of non-elastic fibers can impart crimps to the fibers, improving their stretchability. Meanwhile, in elastic warp knitted fabrics containing elastic fibers, the stretchable range during stretching is affected by the degree to which the non-elastic fibers stop stretching. By imparting crimps to non-elastic fibers, the stretchable range can be expanded, making them suitable for clothing requiring higher elongation, which is preferable. Furthermore, by imparting crimps to non-elastic fibers, the contact area with the elastic fibers or adjacent non-elastic fibers is reduced when the fabric is made into a warp knitted fabric. This reduced contact area is also preferable in that it reduces frictional loss during stretching and is less likely to impair the excellent stretch recovery properties of the elastic fibers.

[0048] The total fineness of the inelastic fibers is preferably in the range of 40 to 100 dtex. If the total fineness is less than 40 dtex, the yarn strength is low and the burst strength required for sportswear and compression wear is insufficient. If the total fineness is more than 100 dtex, the basis weight becomes too high and the fibers are unsuitable for these applications. A more preferred range is 40 to 70 dtex.

[0049] The fineness of the single fiber constituting the inelastic fiber is preferably 0.5 to 5.5 dtex, and more preferably 0.5 to 4.5 dtex. If the single fiber fineness is less than 0.5 dtex, physical properties such as snags and pilling deteriorate. If the single fiber fineness is more than 5.5 dtex, the feel tends to be rough and hard.

[0050] In the present invention, the CF index of the elastic fiber is characterized by satisfying the following formula (Formula 1). √d / L s ≦10.0 (Formula 1)

[0051] where d is the total fineness of the elastic fiber, L sis the sinker loop length per course of the elastic fiber. The CF index of the present invention is a parameter necessary to achieve the range of hysteresis loss rate in the weft direction of the knitted fabric described below, and it is important to appropriately adjust the total fineness of the elastic fibers constituting the elastic warp knitted fabric and the sinker loop length. The cover factor (CF) of a knitted fabric is usually obtained by dividing the square root of the total fineness of the fibers constituting the knitted fabric by the loop length, but in the present invention, the CF index is defined by focusing on the sinker loop length of the elastic fiber, which contributes to reducing the hysteresis loss rate in the weft direction of the knitted fabric.

[0052] Typically, in warp knitted fabrics, the gauge number and runner length of the knitting machine are adjusted based on the total fineness of the fibers used, taking knitting performance into consideration. This is empirically determined depending on the structure of the knitted fabric. Generally, when the total fineness of the fibers is increased, the fiber diameter increases, so the gauge number of the knitting machine is reduced, thereby increasing the distance between the needles. On the other hand, the runner length is increased and the yarn feed length per course is lengthened to adjust the loop length to match the gauge number of the knitting machine, improving knitting performance. The CF index in the present invention is a relationship between the total fineness of the elastic fibers and the sinker loop length. It has been found that, when the gauge number of the knitting machine and the runner length are determined in accordance with conventional methods taking knitting performance into consideration, as described above, this CF index, which represents the relationship between the sinker loop length and the total fineness of the elastic fibers, falls within a generally constant range. For example, when the elastic fibers are used in a double-knit structure, the CF index exceeds 10 under normal knitting conditions, with an upper limit of approximately 13. However, such warp knitted fabrics have insufficient movement tracking during high-speed stretching and contracting movements in the weft direction.

[0053] In the present invention, a CF index of 10.0 or less can be achieved by intentionally increasing the sinker loop length from normal knitting conditions relative to the total fineness of the elastic fibers, i.e., by lengthening the runner length. Here, the sinker loops of the elastic fibers have a lower rate of contact with inelastic fibers or adjacent elastic fibers compared to needle loops, resulting in lower friction loss. Furthermore, as described above, in a double-knit structure, sinker loops parallel to the weft direction of the knitted fabric are formed, so by setting the CF index to 10.0 or less, the hysteresis loss rate in the weft direction can be effectively reduced compared to elastic warp-knitted fabrics knitted under normal knitting conditions. Furthermore, it is preferable that the CF index satisfy the following formula (Formula 2): 6.0≦√d / L s ≦10.0 (Formula 2)

[0054] More preferably, √d / L s is preferably 9.5 or less, and more preferably 9.3 or less.

[0055] The smaller the CF index value, the greater the sinker loop length relative to the total fineness of the elastic fiber, but generally, if the runner length is increased to increase the sinker loop length, the knitting tension decreases and knitting properties deteriorate. A CF index of 6.0 or more is preferable because it is possible to reduce the hysteresis loss rate in the weft direction while maintaining knitting properties.

[0056] As described above, in the present invention, since the elastic fiber constituting the elastic warp knitted fabric has a double-knit structure, the sinker loop length of the elastic fiber significantly contributes to reducing the hysteresis loss rate in the weft direction. To increase the sinker loop length of the elastic fiber, the runner length of the elastic fiber can be appropriately adjusted during knitting of the elastic warp knitted fabric. Specifically, it is preferable to increase the runner length by 20 to 60% relative to the lowest possible runner length. Increasing the runner length of the elastic fiber means increasing the yarn feed rate of the elastic fiber during knitting. The elastic fiber constituting the needle loop portion forms a loop together with the inelastic fiber. As described above, the needle loop portion has a large contact area between the elastic fiber and the inelastic fiber, resulting in a large restraining force. Therefore, even if the yarn feed rate of the elastic fiber increases, the needle loop length does not change significantly. Therefore, increasing the runner length of the elastic fiber significantly contributes to increasing the sinker loop length of the elastic fiber.

[0057] The runner length of the elastic fiber is preferably 160 to 300 cm / rack, It is more preferable that the runner length is 160 to 270 cm / rack. By adjusting the runner length in accordance with the total fineness of the elastic fibers so as to satisfy the CF index, the hysteresis loss rate can be effectively reduced. If the runner length is less than 160 cm / rack, the yarn feed rate of the elastic fibers is insufficient, and the hysteresis loss rate in the weft direction cannot be effectively reduced. On the other hand, if the runner length exceeds 300 cm / rack, the yarn feed rate becomes excessive within the above-mentioned preferable range of elastic fibers, and knitting properties deteriorate, which is not preferable.

[0058] In the present invention, the hysteresis loss rate in the weft direction of the elastic warp knitted fabric at 100% elongation is 40% or less, preferably 35% or less. When the hysteresis loss rate is within this range, when the elastic warp knitted fabric of the present invention is applied to sportswear, particularly compression wear, stress reduction during recovery after the clothing stretches during exercise can be effectively suppressed, and clothing with excellent wearing comfort can be provided. The preferred lower limit is ideally 0%, but realistically 5%.

[0059] The elastic warp knitted fabric of the present invention is cylindrical in both the warp and weft directions of the knitted fabric, and the cylindrical sample is attached to a DeMascher fatigue tester with a diameter of 10 cm and a height of 10 cm, and the effective projected area is 105 cm. 2 After stretching the fabric by 5% in the height direction, the average sagging area of the fabric in the warp and weft directions was 0.8 cm when the fabric was repeatedly stretched by 50% in the height direction at a stretch rate of 3 times / second. 2 It is preferable that the stretching speed is 3 times / second or less. Here, the stretching speed of 3 times / second is assumed to be the running pitch of one leg of a top male 100m runner, and the 50% stretching motion is assumed to be the wearing elongation range during running motion when wearing compression wear. The sagging area of the fabric under these measurement conditions is an index for evaluating the ability of the elastic warp knitted fabric to follow the high-speed movement of the body when it is assumed that high-speed stretching motion is applied to clothing using the elastic warp knitted fabric of the present invention, such as in sprinting. The average value of the sagging area of the fabric in the warp and weft directions of the knitted fabric is 0.8 cm 2 If it is less than 0.7 cm, the elastic warp knitted fabric of the present invention can follow the high-speed movement of the body well, providing an excellent wearing feeling, and effectively suppressing muscle vibration during exercise without sagging of the fabric, which is preferable. 2 The preferable lower limit is that no sagging of the fabric occurs, that is, 0 cm 2 However, in reality it is 0.05cm 2 The method for evaluating the area of sagging fabric will be described in detail in the Examples below.

[0060] The dyeing method of the elastic warp knitted fabric of the present invention is not particularly limited. Examples include scouring, relaxing, heat setting, dyeing, and functional finishing. Functional finishing can be performed as needed to provide water repellency, antistatic properties, flame retardancy, moisture absorption, antibacterial properties, softening properties, and other known functional finishing properties. Among these, softening is preferred because it improves the sliding properties between adjacent fibers and reduces friction loss between yarns.

[0061] The elastic warp knitted fabric of the present invention preferably has a bursting strength of 350 kPa or more, more preferably 380 kPa or more, according to JIS L 1096 Bursting Strength (Method A: Mullen method). When the elastic warp knitted fabric is used in sportswear and compression wear, a bursting strength of 350 kPa or more reduces the likelihood of tearing when the garment is put on or taken off, or when athletes come into contact with each other during exercise, causing the garment to be strongly pressed against the fingers or pulled tightly. To achieve this bursting strength range, the total fineness of the elastic fibers should be set to 30 dtex or more, and the total fineness of the non-elastic fibers should be set to 40 dtex or more.

[0062] The elastic warp knitted fabric of the present invention thus obtained is suitable for use in clothing, as it can follow the movement of the body even during high-speed exercise. Examples of such clothing include clothing that uses the elastic warp knitted fabric of the present invention in at least a portion thereof. It may be used only in areas where conformability is particularly required, or in all of the fabric portions that make up the clothing. Among clothing, it is particularly suitable for sportswear and compression wear. This provides a good fit when worn, and by following the movement of the body even during high-speed exercise, it can provide appropriate support for the body's muscles and contribute to improving athletic function. [Example]

[0063] The textile product of the present invention will be specifically described below with reference to examples.

[0064] (1) Sinker loop length per course of elastic fiber The wale density of the elastic warp knit fabric was measured using the method described in JIS L1096 (2010) "Density of Knitted Fabrics." Next, the inelastic fibers were dissolved to facilitate observation of the sinker loops of the elastic fibers. Specifically, when the inelastic fibers were polyamide fibers, a 10 cm x 10 cm piece of elastic warp knit fabric was immersed in a 20% hydrochloric acid solution adjusted to 30°C without tension. The fabric was stirred with a stirring rod for 3 minutes, and then washed with distilled water adjusted to 30°C. This dissolution process was repeated three times. The wale density after dissolution of the inelastic fibers was then measured, and the weft direction shrinkage correction index was calculated from the wale density before dissolution of the inelastic fibers using the following formula (Equation 3). The sinker loop length before dissolution of the inelastic fibers can be calculated by multiplying the sinker loop length after dissolution of the inelastic fibers, measured in the next step, by the weft direction shrinkage correction index. W=Wa / Wb (Equation 3) (W: shrinkage correction index in the weft direction, Wb: wale density before dissolution of inelastic fibers (wale / 2.54cm), Wa: wale density after dissolution of inelastic fibers (wale / 2.54cm))

[0065] Next, the dissolved inelastic fiber sample was placed on a microscope stage with the sinker surface as the observation surface and observed at 100x magnification. The sinker loop length and sinker loop angle when the inelastic fiber was dissolved were measured. The measured sinker loop length will be explained based on Figure 1. Figure 1 is a schematic diagram for explaining the sinker loop length per course of elastic fiber. When the elastic fiber is in a double-knit structure, there are two sinker loops: a sinker loop connecting needle loops straddling in the course direction (a in Figure 1) and a sinker loop connecting needle loops in the same course (b in Figure 1). Therefore, the sinker loop length a connecting needle loops straddling in the course direction and the sinker loop length b connecting needle loops in the same course were measured. The sinker loop angle θ is the angle of the sinker loop connecting needle loops straddling in the course direction with respect to the weft direction of the knitted fabric, and this was measured as the sinker loop angle θ. The sinker loop length was then calculated using the following equation (Equation 4): L s =W×(acosθ+b) (Equation 4) (L s : sinker loop length, W: shrinkage correction index in the weft direction, a: sinker loop length connecting needle loops across the course direction, b: sinker loop length connecting needle loops in the same course, θ: sinker loop angle)

[0066] That is, L s indicates the sinker loop length in the weft direction at one observation point before the inelastic fiber is dissolved, and is a value that can be obtained by multiplying the sum of each sinker loop length in the weft direction after the inelastic fiber is dissolved by the shrinkage correction index in the weft direction. Since the sinker loops connecting needle loops that cross over in the course direction are not parallel to the weft direction of the knitted fabric, the sinker loop length a connecting needle loops that cross over in the course direction was calculated as the weft component using the sinker loop angle, and this was used. This was observed at 10 random points, and the average value of the 10 points was used as the sinker loop length per course of elastic fiber.

[0067] (2) Total fineness The total fineness was measured according to Method B (simple method) described in JIS L1013 (2010).

[0068] (3)CF index The CF index was calculated using the following formula: CF index=√d / L s (where d is the total fineness of the elastic fiber, L s is the sinker loop length per course of elastic fiber)

[0069] (4) Hysteresis loss rate in the weft direction of the knitted fabric The stress at 100% elongation and recovery of circular knitted fabrics was measured using an Instron universal testing machine. Specifically, five 5 cm wide x 30 cm long samples were taken so that the longitudinal direction of the test piece was perpendicular to the knitting direction (weft direction) of the elastic warp-knitted fabric. Here, the knitting direction of the elastic warp-knitted fabric refers to the direction parallel to the wale direction of the elastic warp-knitted fabric. Next, one of the five samples was attached to the measuring device with a chuck distance of 20 cm and stretched at a tensile speed of 30 cm / min until the elongation reached 100%. The chuck distance was then returned to its original position at the same speed, and the tensile load was removed. The same procedure was repeated for the other four samples. The stress at elongation from 0% to 100% elongation and the stress at recovery from 100% to 0% elongation were measured every 0.02 seconds for each of the five samples. The elongation period was defined as the period from 0% to 100% elongation, and the recovery period was defined as the period from 100% elongation back to 0% elongation. The stress values at each measurement point during the elongation and recovery periods were integrated and added together to determine the sum of the integrals of the stress during the elongation period and the sum of the integrals of the stress during the recovery period. The sum of the integrals of the stress during the elongation period was then subtracted from the sum of the integrals of the stress during the recovery period, and this value was then divided by the sum of the integrals of the stress during the elongation period and multiplied by 100 to calculate the hysteresis loss rate in the weft direction at 100% elongation for one measurement. The average value of five samples was defined as the hysteresis loss rate in the weft direction at 100% elongation.

[0070] (5) Area of sagging fabric A. Preparation of Cylindrical Samples Three samples measuring 12 cm in length and 35 cm in width were prepared in the knitting direction (warp direction) of the fabric. Next, the short sides of each sample were overlapped by 2 mm from the end and sewn together with a lock stitch to obtain three sets of cylindrical samples. For each cylindrical sample, a pair of annular fixing jigs consisting of an inner frame and an outer frame was prepared, and the cylindrical sample was clamped between the fixing jigs at the top and bottom and fixed with screws. At this time, the effective diameter dimension was 10 cm and the effective height dimension was 10 cm.

[0071] B. Pretreatment The cylindrical sample with the fixture attached was placed in a DeMacher type cyclic fatigue tester DC-210 (manufactured by Daiei Scientific Instruments Co., Ltd.). In order to remove the strain from the fabric, the maximum elongation was set to 50% and repeated stretching was performed 10 times at a stretching rate of 1 time / second. After the strain was removed from the fabric, the fabric was stretched 5% in the warp direction to remove any slack before the test, and this was set as the initial position. That is, the effective diameter was 10 cm, the effective height was 10.5 cm, and the effective projected area was 105 cm. 2 This becomes:

[0072] C. Main Test The test conditions were set to a maximum elongation of 50% and a stretching speed of 3 times per second, and repeated stretching was performed for 1 minute. During this time, the cylindrical sample was photographed from the side using a high-speed camera capable of shooting at 100 to 1000 fps.

[0073] D. Quantification of sagging area For the data acquired using the high-speed camera, one image of the initial position before the test began was taken. Next, between 10 and 50 seconds after the start of the test, an extension movement of 50% elongation and a recovery movement were performed, and five images were randomly taken at the moment when the sample contracted to the initial position (height 10.5 cm). The image of the initial position before the test began and one image of the moment when the sample contracted to the initial position were superimposed. Figure 2 is a schematic diagram for explaining the fabric sagging area. The top and bottom of the cylindrical sample are fixed by an upper annular fixing jig 10 and a lower annular fixing jig 11. In the left contour portion 20 of the cylindrical sample, sagging fabric areas 40 and 42 that are deformed to protrude outward and a sagging fabric area 41 that is deformed to be recessed inward are observed relative to the left contour portion 30 of the cylindrical sample at the initial position before the fabric sagging test. Additionally, in the right contour portion 21 of the cylindrical sample, sagging fabric area 44, which appears to have deformed outward relative to the right contour portion 31 of the cylindrical sample at its initial position before the fabric sagging test, and sagging fabric area 43, which appears to have deformed inward relative to the right contour portion 31 of the cylindrical sample at its initial position before the fabric sagging test, were observed. These sagging fabric areas 40-44, i.e., the sagging fabric areas 40-44 where the cylindrical sample deformed outward or inward due to the stretching movement from its initial position before the test began, were calculated using an image processing tool. The sagging area was determined by adding up all absolute values, regardless of whether they were outward or inward. The sagging area was calculated for each of the five acquired images, and the average of the five images was calculated. The same test was performed on the remaining two cylindrical samples, and the average of the sagging areas of the three sets of cylindrical samples was used as the fabric sagging area in the warp direction.

[0074] Furthermore, the direction perpendicular to the knitting direction of the fabric was defined as the weft direction, and the above A to D were carried out on this in the same manner as in the warp direction, and this was defined as the fabric sagging area in the weft direction. Finally, the fabric sagging areas obtained in the warp direction and weft direction were averaged, and this was defined as the average fabric sagging area.

[0075] (6) Bursting strength The bursting strength was measured according to Method A (Mullen method) described in JIS L1096 (2010).

[0076] (7) Wearing evaluation using knee support Using the resulting elastic warp knitted fabric, tubular knee supports were created. The knee supports were 25 cm long, and the diameter was adjusted so that the clothing pressure when the support was worn by the subject was 2.0±0.5 kPa. Five subjects wore the knee supports on both knees, and immediately after donning, marks were made on the subjects' bodies with a pen at the top and bottom of the supports. They then exercised for 5 minutes at a speed equivalent to 35 km / h using an exercise bike (registered trademark). Immediately after exercise, the degree of change in the position of the knee support was measured. If the support had shifted upward from its initial position immediately after donning, the change from the bottom mark was calculated as an absolute value; if it had shifted downward, the change from the top mark was calculated as an absolute value. The changes in the position of the five subjects were averaged and evaluated using the following four-point scale. ◎: The change in the position of the knee supporter was less than 0.7 cm. ○: The change in the position of the knee supporter was between 0.7cm and 1cm. △: The change in the position of the knee supporter was more than 1 cm and less than 3 cm. ×: The change in the position of the knee supporter exceeded 3 cm.

[0077] [Example 1] A polyurethane was produced by subjecting a prepolymer consisting of a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran and MDI to a chain extension reaction using ethylenediamine and diethylamine as chain extenders. The polyurethane was then dry-spun in a conventional manner to obtain a 78 dtex polyurethane elastic fiber (78T-PU1).

[0078] Next, a 56 dtex-18F nylon 6 (Ny) false twist crimped yarn (DTY) (56T-18F-DTY) was used for the front reed, and the 78 dtex polyurethane elastic fiber (78T-PU1) was used for the back reed, and knitting was performed on a 32-gauge single tricot machine under the conditions shown in Table 1 to obtain a knitted fabric. As shown in Figure 3, the front structure was a 10 / 12 / / (non-elastic fiber 51 in Figure 3) double-knit structure, and the back structure was a 13 / 20 / / (elastic fiber 50 in Figure 3) double-knit structure, and both were threaded using a full set. Subsequently, an elastic warp knitted fabric was obtained by dyeing and finishing using the usual method for Ny / PU mixed warp knit fabrics and a water-absorbing finish.

[0079] The obtained elastic warp knitted fabric had a CF index of 9.1 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 30.9%, and an average sagging area of the fabric of 0.5 cm 2 By using an elastic fiber with excellent stretch recovery properties and optimizing the sinker loop length relative to the fineness of the elastic fiber, the fabric had excellent stretch recovery properties in the weft direction and excellent compliance during high-speed stretch exercise. The elastic warp knitted fabric also had a burst strength of 386 kPa, making it suitable for use in sportswear and compression wear. Furthermore, the elastic warp knitted fabric was rated as excellent when worn as a knee supporter, demonstrating that the high-speed stretch compliance of the fabric meant that there was almost no sagging of the fabric even during vigorous leg exercise, preventing the supporter from slipping up.

[0080] [Example 2] A polyurethane was produced by subjecting a prepolymer consisting of a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran and MDI to a chain extension reaction using ethylenediamine and diethylamine as chain extenders. The polyurethane was then dry-spun in a conventional manner to obtain a 44 dtex polyurethane elastic fiber (44T-PU1).

[0081] A 44 dtex-10F nylon 6 false twist crimped yarn (DTY) (44T-10F-DTY) was used for the front reed, and the 44 dtex polyurethane elastic fiber (44T-PU1) was used for the back reed. A 28-gauge single tricot machine was used to knit a fabric under the conditions shown in Table 1. As shown in Figure 4, the front structure was a 10 / 23 / / (non-elastic fiber 61 in Figure 4) double-knit structure, and the back structure was a 20 / 13 / / (elastic fiber 60 in Figure 4). Both were fully threaded. The fabric was then dyed and processed using the usual methods for Ny / PU mixed warp knit fabrics, followed by a water-absorbing finish, to obtain an elastic warp knit fabric.

[0082] The obtained elastic warp knitted fabric had a CF index of 9.2 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 34.3%, and an average sagging area of the fabric of 0.7 cm 2 By using an elastic fiber with excellent stretch recovery properties and optimizing the sinker loop length relative to the fineness of the elastic fiber, the fabric had excellent stretch recovery properties in the weft direction and excellent compliance during high-speed stretch exercise. Furthermore, an elastic warp knitted fabric with a burst strength of 432 kPa was obtained, providing fabric strength suitable for use in sportswear and compression wear. Furthermore, a wearing evaluation using a knee supporter was rated excellent, indicating that even during vigorous leg exercise, the high-speed stretch compliance of the elastic warp knitted fabric resulted in minimal sagging of the fabric and prevented the supporter from slipping up.

[0083] [Example 3] A polyurethane was produced by subjecting a prepolymer consisting of a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran and MDI to a chain extension reaction using ethylenediamine and diethylamine as chain extenders. The polyurethane was then dry-spun in a conventional manner to obtain a 33 dtex polyurethane elastic fiber (33T-PU1).

[0084] A 44 dtex-10F nylon 6 false twist crimped yarn (DTY) (44T-10F-DTY) was used for the front reed, and a 33 dtex polyurethane elastic fiber (33T-PU1) was used for the back reed. A 32-gauge single tricot machine was used to knit the fabric under the conditions shown in Table 1. As shown in Figure 5, the front structure was a 10 / 23 / / (non-elastic fiber 71 in Figure 5) double-knit structure, and the back structure was a 13 / 20 / / (elastic fiber 70 in Figure 5) double-knit structure. Both were fully threaded. The fabric was then dyed and processed using the usual methods for Ny / PU mixed warp knit fabrics, followed by a water-absorbing finish, to obtain an elastic warp knit fabric.

[0085] The obtained elastic warp knitted fabric had a CF index of 8.7 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 37.7%, and an average sagging area of the fabric of 0.7 cm 2 By using an elastic fiber with excellent stretch recovery properties and optimizing the sinker loop length relative to the fineness of the elastic fiber, the fabric had excellent weft stretch recovery properties and excellent compliance during high-speed stretch exercise. Furthermore, an elastic warp knitted fabric with a burst strength of 420 kPa was obtained, providing fabric strength suitable for use in sportswear and compression wear. Furthermore, a wearing evaluation using a knee supporter was rated excellent, indicating that even during vigorous leg exercise, the high-speed stretch compliance of the elastic warp knitted fabric resulted in minimal sagging of the fabric and prevented the supporter from slipping up.

[0086] [Comparative Example 1] A polyurethane was produced by subjecting a prepolymer consisting of polytetramethylene glycol and MDI to a chain extension reaction using ethylenediamine as a chain extender. The polyurethane was then dry-spun in a conventional manner to obtain a regular polyurethane elastic fiber (78T-PU2) of 78 dtex.

[0087] A 56 dtex-18F nylon 6 false twist crimped yarn (DTY) (56T-18F-DTY) was used for the front reed, and the 78 dtex regular type polyurethane elastic fiber (78T-PU2) was used for the back reed. A 32-gauge single tricot machine was used to knit a knitted fabric under the conditions shown in Table 1. As shown in Figure 5, the front structure was a 10 / 23 / / (non-elastic fiber 71 in Figure 5) double-knit structure, and the back structure was a 13 / 20 / / (elastic fiber 70 in Figure 5) double-knit structure. Both were fully threaded. The fabric was then dyed and processed using the usual methods for Ny / PU mixed warp knit fabrics, followed by a water-absorbing finish, to obtain an elastic warp knitted fabric.

[0088] The obtained elastic warp knitted fabric had a CF index of 10.5 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 44.9%, and an average sagging area of the fabric of 0.9 cm 2 The stretch recovery properties in the weft direction were insufficient, and the ability to follow the movement during high-speed stretching exercise was also insufficient, resulting in significant sagging of the fabric. Furthermore, the wearing evaluation using a knee supporter was rated fair, meaning that when performing vigorous leg exercise, the fabric was unable to follow the high-speed stretching exercise, resulting in sagging and the supporter slipping up.

[0089] Comparative Example 2 A polyurethane was produced by subjecting a prepolymer consisting of polytetramethylene glycol and MDI to a chain extension reaction using ethylenediamine as a chain extender. The polyurethane was then dry-spun in a conventional manner to obtain a regular type polyurethane elastic fiber (22T-PU2) of 22 dtex.

[0090] A 44 dtex-10F nylon 6 false twist crimped yarn (DTY) (44T-10F-DTY) was used for the front reed, and the 22 dtex regular type polyurethane elastic fiber (22T-PU2) was used for the back reed. A 32-gauge single tricot machine was used to knit a knitted fabric under the conditions shown in Table 2. As shown in Figure 5, the front structure was a 10 / 23 / / (non-elastic fiber 71 in Figure 5) double-knit structure, and the back structure was a 13 / 20 / / (elastic fiber 70 in Figure 5) double-knit structure. Both were fully threaded. The fabric was then dyed and water-absorbent, as per the usual method for Ny / PU mixed warp knit fabrics, to obtain an elastic warp knitted fabric.

[0091] The obtained elastic warp knitted fabric had a CF index of 7.7 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 46.3%, and an average sagging area of the fabric of 1.0 cm 2 The stretch recovery properties in the weft direction were insufficient, and the ability to follow the movement during high-speed stretching exercise was also insufficient, resulting in significant sagging of the fabric. In addition, the wearing evaluation using a knee supporter was rated as x, and when performing vigorous leg exercise, the fabric was unable to follow the high-speed stretching exercise, resulting in sagging and significant slippage of the supporter.

[0092] Comparative Example 3 A polyurethane was produced by subjecting a prepolymer consisting of polytetramethylene glycol and MDI to a chain extension reaction using ethylenediamine as a chain extender. The polyurethane was then dry-spun in a conventional manner to obtain a regular type polyurethane elastic fiber (33T-PU2) of 33 dtex.

[0093] A 44 dtex-10F nylon 6 false twist crimped yarn (DTY) (44T-10F-DTY) was used for the front reed, and the 33 dtex regular type polyurethane elastic fiber (33T-PU2) was used for the back reed. A 32-gauge single tricot machine was used to knit a knitted fabric under the conditions shown in Table 2. As shown in Figure 5, the front structure was a 10 / 23 / / (non-elastic fiber 71 in Figure 5) double-knit structure, and the back structure was a 13 / 20 / / (elastic fiber 70 in Figure 5) double-knit structure. Both were fully threaded. The fabric was then dyed and water-absorbent, as per the usual method for Ny / PU mixed warp knit fabrics, to obtain an elastic warp knitted fabric.

[0094] The obtained elastic warp knitted fabric had a CF index of 9.6 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 45.6%, and an average sagging area of the fabric of 1.0 cm 2 The stretch recovery properties in the weft direction were insufficient, and the ability to follow the movement during high-speed stretching exercise was also insufficient, resulting in significant sagging of the fabric. In addition, the wearing evaluation using a knee supporter was rated as x, and when performing vigorous leg exercise, the fabric was unable to follow the high-speed stretching exercise, resulting in sagging and significant slippage of the supporter.

[0095] Comparative Example 4 A polyurethane was produced by subjecting a prepolymer consisting of polytetramethylene glycol and MDI to a chain extension reaction using ethylenediamine as a chain extender. The polyurethane was then dry-spun in a conventional manner to obtain a regular type polyurethane elastic fiber (117T-PU2) of 117 dtex.

[0096] An 84 dtex-72F cationic dyeable polyester (PET) false twist crimped yarn (DTY) (84T-72F-DTY) was used for the front reed, and a 117 dtex regular polyurethane elastic fiber (117T-PU2) was used for the back reed. The fabric was knitted on a 28-gauge single tricot machine under the conditions shown in Table 2. As shown in Figure 6, the front structure was 10 / 12 / / (non-elastic fiber 81 in Figure 6) and the back structure was 23 / 10 / / (elastic fiber 80 in Figure 6), and both were threaded using a full set. The cationic dyeable polyester / PU mixed warp knit fabric was then dyed and water-absorbent treated according to the usual dyeing method, resulting in an elastic warp knit fabric.

[0097] The obtained elastic warp knitted fabric had a CF index of 12.7 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 42.9%, and an average sagging area of the fabric of 1.5 cm 2 The stretch recovery properties in the weft direction were insufficient, and the ability to follow the movement during high-speed stretching exercise was also insufficient, resulting in significant sagging of the fabric. In addition, the wearing evaluation using a knee supporter was rated as x, and when performing vigorous leg exercise, the fabric was unable to follow the high-speed stretching exercise, resulting in sagging and significant slippage of the supporter.

[0098] Comparative Example 5 An elastic warp knitted fabric was obtained in the same manner as in Example 1, except that the nylon 6 false twist crimped yarn described in Example 1 was used for the front reed and polyurethane elastic fiber was used for the back reed, and the runner length of the polyurethane elastic fiber was changed to 168 cm / rack.

[0099] The obtained elastic warp knitted fabric had a CF index of 10.8 for the elastic fiber, a hysteresis loss rate in the weft direction of the knitted fabric of 41.0%, and an average sagging area of the fabric of 0.8 cm 2The use of polyurethane elastic fiber with excellent stretch recovery properties prevented the fabric from sagging during high-speed stretching exercise. On the other hand, the wearing evaluation using the knee supporter was rated △, meaning that the fabric could not keep up with the high-speed stretching exercise during vigorous leg exercise, resulting in greater sagging and the supporter slipping up compared to Examples 1 to 3, which were rated ◯ or higher.

[0100] From the above, the elastic warp knitted fabric of the present invention has excellent stretch recovery properties in the weft direction of the knitted fabric and can follow the movements of the body even during high-speed exercise.Therefore, when applied to sportswear and compression wear in particular, it is expected to suppress the decline in muscle support function and improve performance by suppressing muscle vibration.

[0101] [Table 1]

[0102] [Table 2] [Explanation of symbols]

[0103] a: Sinker loop length connecting needle loops across the course b: Sinker loop length connecting needle loops on the same course θ: Sinker loop angle 10: Upper part of the annular fixture 11: Lower part of circular fixture 20: Left contour of cylindrical sample 21: Right contour of cylindrical sample 30: Left contour of cylindrical sample at initial position before fabric sagging test 31: Right contour of cylindrical sample at initial position before fabric sagging test 40~44: Fabric sagging area 50: Elastic fiber 51: Non-elastic fiber 60: Elastic fiber 61: Inelastic fiber 70: Elastic fiber 71: Non-elastic fiber 80: Elastic fiber 81: Inelastic fiber

Claims

1. An elastic warp knitted fabric knitted from elastic fibers and non-elastic fibers, wherein the elastic fibers are made of a polyurethane elastomer in which a polyol component is a copolyether polyol of tetrahydrofuran and 3-alkyltetrahydrofuran and an isocyanate component is bis-(p-isocyanatophenyl)-methane, and the elastic fibers are knitted in a double-knit structure, and the CF index of the elastic fibers satisfies the following formula (Formula 1): √d / Ls≦10.0...(Formula 1) (where d is the total fineness of the elastic fiber, and Ls is the sinker loop length per course of the elastic fiber) The elastic warp knitted fabric has a hysteresis loss rate of 40% or less in the weft direction when stretched 100%.

2. The elastic warp knitted fabric is shaped like a cylinder in both the warp and weft directions of the fabric, and the cylindrical sample is attached to a DeMascher fatigue testing machine with a diameter of 10 cm and a height of 10 cm.The sample is then stretched 5% in the height direction to give an effective projected area of 105 cm2, and the sample is then repeatedly stretched 50% in the height direction at a stretch rate of 3 times per second.The average value of the sagging area of the fabric in the warp and weft directions of the fabric is 0.8 cm2 or less.

3. 3. The elastic warp knitted fabric according to claim 1, wherein the elastic fibers have a total fineness of 30 to 120 dtex.

4. 4. The elastic warp knitted fabric according to claim 1, wherein the non-elastic fiber is a false twisted crimped yarn.

5. 5. The elastic warp knitted fabric according to claim 1, wherein the inelastic fiber is a polyamide fiber.

6. 6. The elastic warp knitted fabric according to claim 1, wherein the inelastic fibers have a total fineness of 40 to 100 dtex.

7. The elastic warp knitted fabric according to any one of claims 1 to 6, which has a burst strength of 350 kPa or more.

8. A garment comprising at least a part of the elastic warp knitted fabric according to any one of claims 1 to 7.

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