Spun yarn and fabric made from it

Abstract

To provide a spun yarn which is low in cost, can be processed simply, has excellent anti-pilling properties, and is not affected by abrasion resistance. [Solution] The present invention relates to a spun yarn and a fabric made from the same. The spun yarn contains synthetic fibers with an elastic recovery rate of 50% or more after 10 repeated stretches, and the content of the synthetic fibers is 40wt% or more, which effectively prevents the occurrence of pilling caused by friction, and does not require the use of any anti-pilling agent, and the strength of the fibers is maintained and the abrasion resistance is not affected. The fabric made from the spun yarn can be widely used in the manufacture of sportswear, casualwear, etc.

Description

[Technical field]

[0001] The present invention relates to a spun yarn and a fabric made using the same. [Background technology]

[0002] As living standards improve, people's demands for fabrics are also increasing. Knitted fabrics made from spun yarn have advantages such as a soft feel and good breathability, and are loved by many consumers. However, they have problems such as being prone to pilling and having poor abrasion resistance. For this reason, much research and development is being conducted.

[0003] For example, Patent Document 1 discloses an acrylic fiber for low pill fabrics having a breaking elongation of not more than 35% and a knot strength of not more than 1.7 g / D, which effectively inhibits the formation of pills and improves anti-pilling properties, but affects abrasion resistance.

[0004] Patent Document 2 also discloses a fabric made of anti-pilling polyester spun yarn. Specifically, anti-pilling polyester spun yarn and cotton spun yarn are used as warp yarns of the fabric, and anti-pilling polyester spun yarn and wool are used as weft yarns, among which the anti-pilling polyester spun yarn is obtained by adding a pilling inhibitor in the spinning process, and it is disclosed that the anti-pilling property of the fabric is significantly improved by forming a structure similar to that of natural fibers on the surface of the polyester fiber. However, the method of adding a pilling inhibitor in the spinning process is complicated and expensive, and there is also a problem that the fiber strength is reduced, affecting the abrasion resistance of the fabric. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 4-240209 [Patent Document 2] China Patent Application Publication No. 102505261 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a spun yarn which is low in cost, has a simple processing process, has excellent anti-pilling properties, and is not affected by abrasion resistance.

[0007] Another object of the present invention is to provide a fabric made using the spun yarn. [Means for solving the problem]

[0008] The present invention, which solves these problems, is as follows.

[0009] (1) The spun yarn of the present invention contains synthetic fibers having an elastic recovery rate of 50% or more after repeated stretching 10 times, and the content of said synthetic fibers is 40 wt% or more.

[0010] (2) The knot strength of the synthetic fiber is 2.0 to 6.0 cN / dtex.

[0011] (3) The synthetic fiber is a polyester fiber.

[0012] (4) The polyester fibers are polyethylene terephthalate fibers and / or polybutylene terephthalate fibers.

[0013] (5) The twist coefficient of the spun yarn is 2.0 to 6.0, and the single fiber constituting the spun yarn has a fineness of 0.5 to 4.0 dtex and a length of 35 to 110 mm.

[0014] (6) The spun yarn is obtained by a silo compact spinning method, a silo spinning method or a compact spinning method.

[0015] (7) The spun yarn is obtained by a vortex spinning method.

[0016] (8) A fabric using 40 wt % or more of the spun yarn according to any one of (1) to (7) above.

[0017] (9) The fabric has an anti-pilling property of Grade 3 or higher according to GB / T 4802.2:2008 standard, and / or an abrasion resistance of 30,000 times or higher according to JIS L 1096:2010 method E.

[0018] (10) The spun yarn is exposed on at least one side of the fabric, and the exposure rate is 30% or more. Effect of the Invention

[0019] The spun yarn of the present invention uses a specified content of synthetic fibers with excellent elastic recovery properties, which effectively suppresses the occurrence of the phenomenon in which fibers are pulled out due to friction and cause pilling, does not require the use of any anti-pilling agents, maintains the strength of the fibers, does not affect abrasion resistance, and is low cost, so that fabrics using the same can be widely used in the production of sportswear, casual wear, etc. [Brief description of the drawings]

[0020] [Figure 1] 1 is a diagram showing the elastic recovery of a synthetic fiber monofilament after it has been stretched, where a is the length of the stretched portion and b is the length of the recovered portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] After a synthetic fiber monofilament is stretched (especially stretched by 10%), there will be stretch-recoverable and non-stretch-recoverable parts in the recovery process. The higher the proportion of stretch-recoverable parts, the better the elastic recovery of the fiber. The spun yarn of the present invention contains synthetic fibers with an elastic recovery rate of 50% or more after 10 repeated stretching, so that even if the synthetic fibers are pulled out during the friction process, most of them will return to their original state, making them less likely to pill. On the other hand, if the synthetic fibers have an elastic recovery rate of less than 50% after 10 repeated stretching, fatigue will be significant after repeated stretching, and the fuzz pulled out during the friction process will not return to its original state and will become fuzz balls. With subsequent repeated friction, the fuzz balls will become larger and more numerous, resulting in poor anti-pilling properties of the fabric.

[0022] The spun yarn of the present invention may be made of 100wt% of the synthetic fiber, or may be blended with other short fibers. Preferably, it is made of 100wt% of the synthetic fiber. This reduces the possibility of pilling and ensures anti-pilling properties even when rubbed repeatedly. When the spun yarn of the present invention is made of a blend of the synthetic fiber and other short fibers, if the content of the synthetic fiber is less than 40wt%, the content of short fibers that are easily pulled out and fluffed and prone to pilling is high, which has a significant effect on the anti-pilling properties of the fabric. Therefore, the content of the synthetic fiber in the spun yarn of the present invention is required to be 40wt% or more.

[0023] When the spun yarn of the present invention is obtained by blending the above-mentioned synthetic fibers with other staple fibers, the blending method is not particularly limited. For example, a raw cotton blending method in a blending or carding process may be used, a sliver blending method in a drawing or gilling mixing process may be used, or a method of spinning and twisting a number of rovings in a spinning process may be used.

[0024] The synthetic fibers in the spun yarn of the present invention may be staple fibers having the same elastic recovery rate or may be staple fibers having different elastic recovery rates, as long as both have elastic recovery rates of 50% or more.

[0025] Preferably, the knot strength of the synthetic fiber is 2 to 6 cN / dtex. If the knot strength is less than 2 cN / dtex, the breaking strength of the staple fiber is relatively low, which may affect the strength of the spun yarn, and the abrasion resistance of the resulting fabric tends to decrease. If the knot strength exceeds 6 cN / dtex, the strength of the spun yarn increases to a certain extent, but pilling resistance tends to decrease because pills formed during repeated friction are difficult to remove.

[0026] The type of the synthetic fiber is not particularly limited, but examples thereof include polyester fiber, acrylic fiber, polyamide fiber, etc., and polyester fiber is preferable. The polyester fiber is one or more of polyethylene terephthalate fiber (PET), polybutylene terephthalate fiber (PBT), and polypropylene terephthalate fiber (PTT). The fiber is obtained by using raw silk through processes such as drawing, shrinking, heat setting (130 to 170°C), and cutting.

[0027] Among them, the molecular structure of PBT fiber has an ester group and a benzene ring structure, and compared with regular PET fiber, the soft segment in the basic segment is long, the melting point is relatively low, and the main chain structure is helical, so that it is easy to generate micro-crimps. The molecular structure of PTT fiber has a "trans-gauche-gauche-trans" structure, exhibiting an obvious "Z"-shaped structure, and since it has three methylene segments in the molecular chain, an "odd carbon atom (methylene group) effect" occurs between the molecular chains. Such a molecular structure gives the PTT fiber a deformation ability like a coil spring. Knitted fabrics are the application that can best realize the effects of the spun yarn of the present invention, but since the Young's modulus of PTT fiber is relatively low, it may affect the dimensional stability of the knitted fabric, and on the other hand, since the elongation of PTT fiber is relatively high, when it is rubbed for a long time or with high intensity, it is stretched and becomes long, and it is easy to be entangled with the surrounding fluff, so that the anti-pilling effect tends to be deteriorated. Therefore, in the present invention, the synthetic fiber is more preferably PBT fiber.

[0028] Furthermore, if the fibers are prone to stretching during the spinning process, problems such as deterioration in the quality and strength of the spun yarn may occur. Therefore, it is most preferable that the synthetic fibers have a Young's modulus of 30 cN / dtex or more and an elongation of 75% or less.

[0029] The type of the other short fibers is not particularly limited, but can be selected as necessary. For example, natural fibers, regenerated fibers, synthetic fibers with an elastic recovery rate of less than 50%, etc. are included. Natural fibers include cotton, hemp, wool, silk, etc., and regenerated fibers include cuprammonium fibers, rayon fibers, acetate fibers, etc.

[0030] The twist factor, the fineness and length of the single fibers constituting the spun yarn are also important for the spun yarn of the present invention. Taking the English twist factor as an example, if the twist factor of the spun yarn is less than 2.0, the binding force between the short fibers is low, the phenomenon of loose twisting occurs frequently, the strength of the spun yarn tends to decrease, and the frequency of yarn breakage increases during the spinning process, and the fuzz and neps also tend to increase. If the twist factor exceeds 6.0, the twist angle of the single fiber becomes large, the strength utilization rate of the single fiber decreases, the strength of the spun yarn tends to decrease, the yarn is easily twisted and snarls occur, the occurrence rate of stoppage or fabric defects due to yarn breakage also tends to increase, and the texture of the obtained fabric tends to become hard. If the fineness of the single fiber is less than 0.5 dtex, spinning processing becomes difficult, and neps are easily generated due to the small bending rigidity of the fiber, which may affect the quality of the fabric surface. On the other hand, if the fineness of the single fiber exceeds 4.0 dtex, the number of single fibers constituting the spun yarn decreases under the same conditions, the binding force between the fibers decreases, and the fuzz is easily pulled out during the friction process to form pills, which tends to deteriorate the anti-pilling properties. In addition, the bending rigidity of the single fiber is high, so there is a possibility of insufficient carding, and the quality of the formed web tends to deteriorate. If the length of the single fiber is less than 35 mm, the binding force between the fibers becomes weak, which tends to increase the occurrence of yarn breakage during spinning, and even if the spun yarn is produced, the fibers are relatively short, so the fuzz is easily pulled out during the friction process to form pills, which tends to deteriorate the anti-pilling properties. On the other hand, if the length of the single fiber exceeds 110 mm, damage and cutting are easily caused during the mixing process or carding process, the number of neps increases, and the neps are easily agglomerated during the friction process, which tends to deteriorate the anti-pilling properties. Therefore, in the present invention, it is preferable that the twist coefficient of the spun yarn is 2.0 to 6.0, the fineness of the single fiber constituting the spun yarn is 0.5 to 4.0 dtex, and the length is 35 to 110 mm.

[0031] The spinning method of the spun yarn of the present invention is not particularly limited, and includes vortex spinning, ring spinning, silo compact spinning, silo spinning, compact spinning, etc. In order to achieve both anti-pilling properties and texture, silo compact spinning, silo spinning, or compact spinning is preferred. Among them, silo compact spinning is a new spinning technology that combines silo spinning and compact spinning, in which two rovings are fed into a draft mechanism in parallel through a trumpet mouth with a certain interval, and when they leave the front roller, they are converged by the suction action of negative pressure airflow, and then twisted to be integrated, resulting in a denser structure and a significantly reduced fuzz, so silo compact spinning is more preferred. In the vortex spinning method, a fiber bundle is twisted into a yarn by using a high-speed air vortex generated inside a nozzle, and the resulting yarn has a double structure in which the core fibers are arranged in parallel in an untwisted state, the sheath fibers are entangled around the outer periphery of the core fibers, and both the heads and tails of the fibers are twisted inside the spun yarn, resulting in a dense structure with very little fuzz, making the vortex spinning method preferable in terms of better pilling resistance.

[0032] Fabric is manufactured using 40 wt% or more of the above spun yarn as a raw material. The fabric here may be woven or knitted. When the spun yarn of the present invention is partially used, the other yarns are not particularly limited, but can be selected as necessary. For example, 100% cotton spun yarn, 100% rayon spun yarn, polyester / cotton blended yarn (the polyester fiber here is a PET fiber with an elastic recovery rate of less than 50% after repeated elongation 10 times), etc. can be mentioned. Here, the knitted fabric can be circular knitted and weft knitted, or warp knitted. Examples of the structure of the circular knitted fabric and the weft knitted fabric include, but are not limited to, flat knitted, rib knitted, double-sided knitted, purl knitted, tuck knitted, floating knitted, lace knitted, affixed knitted, and one-sided rib knitted. Examples of the structure of the warp knitted fabric include, but are not limited to, single denbigh knitted, single atlas knitted, double cord knitted, double half tricot knitted, fleece knitted, and jacquard knitted. Among them, circular knitted fabrics are more preferable in terms of anti-pilling properties. On the other hand, the number of layers may be either a single layer or multiple layers, but the multi-layer structure is one having two layers or more layers.

[0033] Preferably, the fabric of the present invention has an anti-pilling property of grade 3 or higher according to the GB / T 4802.2:2008 standard and / or an abrasion resistance of 30,000 times or higher according to the JIS L 1096:2010 standard, method E.

[0034] Preferably, the spun yarn of the present invention is exposed on at least one side of the fabric, with an exposure rate of 30% or more. If the exposure rate of the spun yarn of the present invention on one side of the fabric is less than 30%, the content of pill-forming yarn is high, the incidence of pilling due to friction increases, and the anti-pilling properties of the fabric tend to decrease.

[0035] In addition, as long as the fabric is not damaged, post-processing may involve ordinary dyeing, water absorption, water repellency, etc., and various types of processing may be carried out to impart functions such as ultraviolet protection, antibacterial properties, deodorizing properties, insect repellent properties, phosphorescent properties, reflective properties, negative ion generating properties, etc.

[0036] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited thereto. Each parameter according to the present invention was measured by the following method.

[0037] (1) Elastic recovery rate and blend ratio of synthetic fibers A. Sampling If necessary, <1> or <2> Sampling is done by: <1> Directly prepare five spun yarns with a length of 5 cm, untwist them, and select the short fibers with a length of 30 mm or more as samples. Record the number of samples as X. <2> In accordance with the JIS L 1030-1:2012 standard, determine the type of yarn that constitutes the fabric, disassemble the spun yarn containing synthetic fibers, prepare five spun yarns with a length of 5 cm, untwist them, and take the short fibers with a length of 30 mm or more as samples. Record the number of samples as X. B. Testing Equipment Using an RTC-1225 A-type tensile testing machine (manufactured by INTEC CO., LTD) with an Orientec printer (AR-6600-7), the extension and recovery test was performed by selecting the EXTENSION CYCLE TEST program, setting the grip interval to 20 mm, elongation to 10%, and tensile speed to 20 mm / min. C. Measurements and Calculations In a straight and unstretched state, one sample prepared in step A was fixed to the upper and lower grips of the tester, the test start button was pressed, the sample was stretched to 10% elongation and then allowed to recover, and the first curve was automatically drawn at the same time. After one minute, the origin of the drawing was adjusted so that the needle was at the origin of the millimeter coordinate paper, and the measurement procedure of the stretch recovery was repeated to draw a second curve. A total of 10 measurements were made, and 10 curves were obtained. As shown in Figure 1, on the millimeter coordinate paper, a is the length of the stretched part, b is the length of the recovered part, and the transverse length of the longest curve was recorded as a+b. The elastic recovery rate of a single fiber after 10 repeated stretches was calculated using the following formula: Elastic recovery (%) = [b / (a+b)] × 100.

[0038] All samples were measured in the same manner, the elastic recovery of each single fiber sample was recorded, and the average of the data with an elastic recovery of 50% or more was calculated, and this average was regarded as the elastic recovery of the synthetic fiber of the present invention after 10 repeated stretches. The number of fibers with an elastic recovery of 50% or more was counted and recorded as f1, and the synthetic fiber blend ratio was calculated by the following formula. Mixing rate (%)=(f1 / X)×100.

[0039] (2) Spun yarn blend ratio A complete structure was marked in the fabric, and a sample was taken along the edge of the complete structure. (If the size of a complete structure is less than 5 cm x 5 cm, a sample of 5 cm x 5 cm should be taken.) All yarns were extracted, weighed, and recorded as m. In accordance with the JIS L 1030-1:2012 standard, the type of yarn constituting the fabric was identified, and spun yarns containing synthetic fibers were picked up. Based on the method for measuring the elastic recovery rate of synthetic fibers, it was determined whether the spun yarns contained synthetic fibers with an elastic recovery rate of 50% or more. The weight of the spun yarns containing synthetic fibers with an elastic recovery rate of 50% or more was measured and recorded as m1, and the blend ratio of spun yarns in the fabric was calculated using the following formula. Mixing rate (%)=(m1 / m)×100.

[0040] (3) Nodule strength Measurements are made in accordance with JIS L 1015:2010 standards.

[0041] (4) Anti-pilling properties Measured according to GB / T 4802.2:2008 standard.

[0042] (5) Abrasion resistance Measurements are performed in accordance with JIS L 1096:2010 standard (Method E).

[0043] In the first measurement, the number of frictions is set to 20,000 times, and the wear status of the fabric is checked after 20,000 frictions. If the fabric is damaged, the measurement is stopped and the wear resistance is judged to be 10,000 times. If the fabric is not damaged (woven fabric: two or more broken threads, knitted fabric: damaged parts), the measurement is continued. For the continuous measurement, the number of frictions is set to 10,000 times, and the wear status of the fabric is checked after 10,000 frictions. If the fabric is damaged, the measurement is stopped and the wear resistance is judged to be 20,000 times. If the fabric does not have two or more broken threads, the measurement is continued. For the continuous measurement, the number of frictions is set to 10,000 times, and the wear status of the fabric is observed after 10,000 frictions. If the fabric is damaged, the measurement is stopped and the wear resistance is judged to be 30,000 times. The wear status of the fabric is checked every 10,000 times until damage occurs. If the cumulative number of frictions reaches 100,000 times, the wear status of the fabric is checked after 100,000 frictions, and if damage occurs, the wear resistance is judged to be 90,000 times. If no damage occurs to the fabric, the abrasion resistance is determined to be 100,000 cycles or more.

[0044] (6) Exposure rate of spun yarn on one side of the fabric Two complete structures are determined on one side of the fabric. First, in accordance with the JIS L 1030-1:2012 standard, all the types of yarns in one complete structure are identified, and spun yarns containing synthetic fibers are picked up. Based on the measurement method of the elastic recovery rate of the synthetic fibers, it is determined whether there is any synthetic fiber with an elastic recovery rate of 50% or more in the spun yarn, and the specific position of the spun yarn in the complete structure is clarified. Next, a digital microscope (manufactured by Keyence Corporation) is used to take a photo of the other complete structure, and the photo is printed on A4 size paper (if a photo of the complete structure cannot be taken even at the lowest magnification of the digital microscope, a photo is taken using a digital camera), and the excess part is cut off with scissors, leaving only one complete structure, which is weighed and recorded as G. According to the specific position of the spun yarn in the complete structure, the relevant part is cut out from the paper, weighed and recorded as g1, and the exposure rate of the spun yarn is calculated according to the following formula. Exposure rate (%)=(g1 / G)×100.

[0045] (7) Bending resistance Measured according to JIS L 1096:2010 (Method A) standards. The smaller the value, the higher the flexibility.

[0046] Example 1 Using PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex as the raw material, the yarn was successively subjected to a blending cotton process, a carding process, a drawing process, a roving process, a silo compact process, and a yarn winding process, where the drawing process: two-times drawing, draft ratio of 8, and fixed weight of 16 g / 5 m, the roving process: draft ratio of 9, twist coefficient of 0.6, and fixed weight of 3.5 g / 10 m, and the silo compact process: spindle rotation speed of 12,500 rpm, draft ratio of 49, twist coefficient of 3.7, and air pressure of 2,300 Pa, to obtain a spun yarn of English count 40 with a PBT content of 100 wt% according to the present invention.

[0047] The obtained spun yarn was used in a circular knitting machine to knit a plain knit structure under the conditions of a weft density of 45 welts / inch and a warp density of 62 courses / inch to obtain a green fabric, which was then subjected to scouring (90°C x 20 minutes) → dyeing (disperse dye DK9Z3, manufactured by Zhejiang Longsheng Dye Chemical Co., Ltd., 120°C x 30 minutes) → post-processing (moisture absorption and desorption processing agent HS-TC-18, manufactured by Zhuhai Huadahaohong Chemical Co., Ltd., usage amount 10 owf%, bath processing 80°C x 20 minutes) → drying (150°C x 1 minute) → setting (170°C x 1 minute) to obtain a knitted fabric of the present invention. See Table 1 for specific parameters.

[0048] Example 2 The same procedure as in Example 1 was followed except that PTT raw cotton (manufactured by Shanghai Defu Lun Chemical Fiber Co., Ltd.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.2 cN / dtex was used as the raw material, to obtain a spun yarn and knitted fabric of the present invention with a PTT content of 100 wt% and a British count of 40. See Table 1 for specific parameters.

[0049] Example 3 A spun yarn and knitted fabric of the present invention with a British count of 40 and a PBT content of 100 wt% were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.70 dtex, fiber length of 38 mm, and knot strength of 5.5 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0050] Example 4 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and a British count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.70 dtex, fiber length of 38 mm, and knot strength of 6.5 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0051] Example 5 A spun yarn and knitted fabric of the present invention with a British count of 40 and a PBT content of 100 wt% were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.65 dtex, fiber length of 38 mm, and knot strength of 2.0 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0052] Example 6 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and a British count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.65 dtex, fiber length of 38 mm, and knot strength of 1.5 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0053] Example 7 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and English count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 0.50 dtex, fiber length of 35 mm, and knot strength of 3.1 cN / dtex was used as the raw material and the twist factor of the Silo Compact was changed to 4.2. See Table 1 for specific parameters.

[0054] Example 8 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and English count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 4.00 dtex, fiber length of 110 mm, and knot strength of 3.1 cN / dtex was used as the raw material and the twist factor of the Silo Compact was changed to 3.0. See Table 1 for specific parameters.

[0055] Example 9 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and English count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex was used as the raw material and the twist factor of the Silo Compact was changed to 6.0. See Table 1 for specific parameters.

[0056] Example 10 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and English count of 40 were obtained in the same manner as in Example 1, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex was used as the raw material and the twist factor of the Silo Compact was changed to 2.0. See Table 1 for specific parameters.

[0057] Example 11 A sliver made of PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex was designated as sliver A, a sliver made of Brazilian cotton / American cotton (weight ratio of 50:50) was designated as sliver B, and the weight ratio of sliver A to sliver B was 65:35, and drawing was performed three times in the same manner as in Example 1 to obtain a spun yarn and knitted fabric of the present invention with a PBT content of 65 wt% and English count of 40. See Table 1 for specific parameters.

[0058] Example 12 A sliver made of PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.56 dtex, fiber length of 38 mm, and knot strength of 3.9 cN / dtex was designated as sliver A, a sliver made of Brazilian cotton / American cotton (weight ratio of 50:50) was designated as sliver B, and the weight ratio of sliver A to sliver B was 45:55, and drawing was performed three times in the same manner as in Example 1 to obtain a spun yarn and knitted fabric of the present invention with a PBT content of 45 wt% and English count of 40. See Table 1 for specific parameters.

[0059] Example 13 Using PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex as the raw material, the yarn was successively subjected to a blending process, a carding process, a drawing process, a roving process, a ring process, and a winding process, and the same procedures were followed as in Example 1, except that the roving process had a draft ratio of 8 and a fixed amount of 4 g / 10 m, and the ring process had a draft ratio of 28, to obtain a spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and an English count of 40. See Table 1 for specific parameters.

[0060] Example 14 Using PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex as the raw material, the yarn was successively subjected to a blending and combing process, a drawing process, a roving process, a silo process, and a winding process, and the same procedures were followed as in Example 1 except that the draft ratio in the silo process was 49 times, to obtain a spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and an English count of 40. See Table 1 for specific parameters.

[0061] Example 15 Using PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex as the raw material, the yarn was successively subjected to a blending process, a carding process, a drawing process, a roving process, a compacting process, and a winding process, and the same procedures were followed as in Example 1 except that the roving process had a draft ratio of 8 and a fixed weight of 4 g / 10 m, and the compacting process had a draft ratio of 28, to obtain a spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and an English count of 40. See Table 1 for specific parameters.

[0062] Example 16 Using PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex as the raw material, the yarn was successively subjected to a mixed cotton process, a carding process, a drawing process, and an air whirlpool spinning process, in which the drawing process was performed in three steps, with a draft ratio of 8 and a fixed weight of 11 g / 5 m, and the air whirlpool spinning process was performed in total with a draft ratio of 150 and a speed of 300 m / min, in the same manner as in Example 1, to obtain a spun yarn and knitted fabric with a PBT content of 100 wt% and an English count of 40 according to the present invention. See Table 1 for specific parameters.

[0063] Example 17 The spun yarn obtained in Example 1 was interwoven with cotton yarn of English count 30 in a 1:1 ratio, and the dyeing process was the same as in Example 1 except that the PBT fiber was first dyed (disperse dye DK9Z3, manufactured by Zhejiang Longsheng Dye Chemical Co., Ltd., 120°C x 30 minutes), and then the cotton fiber was dyed (active dye RK901, manufactured by Wuxi Advanced Chemical Co., Ltd., 60°C x 60 minutes), to obtain a knitted fabric of the present invention. See Table 1 for specific parameters.

[0064] Example 18 The knitted fabric of the present invention was obtained in the same manner as in Example 17, except that the spun yarn obtained in Example 1 and cotton yarn having a British count of 30 were interwoven in a ratio of 1:2. See Table 1 for specific parameters.

[0065] Example 19 A spun yarn and knitted fabric of the present invention with a British count of 40 and a PBT content of 100 wt% were obtained in the same manner as in Example 1, except that PET raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.56 dtex, fiber length of 38 mm, and knot strength of 4.5 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0066] Example 20 A spun yarn and knitted fabric of the present invention with a PBT content of 100 wt% and English count of 40 were obtained in the same manner as in Example 11, except that PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex was used as the raw material and the twist factor of the Silo Compact was changed to 1.8. See Table 1 for specific parameters.

[0067] Example 21 Raw material A was PET raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.56 dtex, fiber length of 38 mm, and knot strength of 4.5 cN / dtex, and raw material B was PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.67 dtex, fiber length of 38 mm, and knot strength of 3.1 cN / dtex. Raw materials A and B were mixed in a weight ratio of 65:35 and sequentially passed through a mixed cotton process, a carding process, a drawing process, a roving process, a ring process, and a winding process, and the drawing process was performed in the same manner as in Example 1, except that the drawing process was drawn three times, to obtain a spun yarn and knitted fabric of the present invention with a PET content of 65 wt% and a PBT content of 35 wt% and an English count of 40. See Table 1 for specific parameters.

[0068] Comparative Example 1 A spun yarn and knitted fabric with a British count of 40 and a PET content of 100 wt% were obtained in the same manner as in Example 1, except that PET raw cotton (manufactured by China Petrochemical Yizheng Chemical Fiber Co., Ltd.) with a fineness of 1.56 dtex, fiber length of 38 mm, and knot strength of 4.5 cN / dtex was used as the raw material. See Table 1 for specific parameters.

[0069] Comparative Example 2 A sliver made of PBT raw cotton (manufactured by Toray Industries, Inc.) with a fineness of 1.56 dtex, fiber length of 38 mm, and knot strength of 3.9 cN / dtex was designated as sliver A, a sliver made of Brazilian cotton / American cotton (weight ratio of 50:50) was designated as sliver B, and the weight ratio of sliver A to sliver B was 35:65, and drawing was performed three times in the same manner as in Example 1 to obtain a spun yarn and knitted fabric of the present invention with a PET content of 35 wt% and English count of 40. See Table 1 for specific parameters.

[0070] [Table 1]

[0071] According to the above table, (1) From Example 1 and Example 2, it was found that, under the same conditions, the spun yarn made of PBT staple fiber having an elastic recovery of 80% and a knot strength of 3.1 cN / dtex was superior to the spun yarn made of PTT staple fiber having an elastic recovery of 82% and a knot strength of 3.2 cN / dtex in both pilling resistance and abrasion resistance, but the bending resistance value was slightly higher than that of the latter, i.e., the flexibility was slightly inferior to that of the latter.

[0072] (2) From Examples 3 and 4, it was found that, under the same conditions, the spun yarn made of PBT staple fiber with a knot strength of 5.5 cN / dtex had better anti-pilling properties of the fabric obtained using the former than the spun yarn made of PBT staple fiber with a knot strength of 6.5 cN / dtex, but the abrasion resistance and flexibility (stiffness and stiffness) of each fabric were at the same level.

[0073] (3) From Examples 5 and 6, it was found that, under the same conditions, the spun yarn made of PBT staple fiber with a knot strength of 2.0 cN / dtex had a better abrasion resistance of the fabric obtained using the former than the spun yarn made of PBT staple fiber with a knot strength of 1.5 cN / dtex, but the anti-pilling properties and flexibility (stiffness and stiffness) of the respective fabrics were at the same level.

[0074] (4) From Example 1 and Example 15, it was found that, under the same conditions, the yarn obtained by the silo compact spinning method was superior to the yarn obtained by the compact spinning method in terms of both anti-pilling properties and abrasion resistance of the fabric obtained using the former, but the bending resistance value was slightly higher than that of the latter, i.e., the flexibility was slightly inferior to the latter.

[0075] (5) From Example 1 and Example 16, it was found that, under the same conditions, the yarn obtained by the silo compact spinning method was inferior in anti-pilling properties of the fabric obtained by the vortex spinning method, but the texture was superior to that of the latter, and the abrasion resistance of each fabric was at the same level.

[0076] (6) From Examples 17 and 18, it was found that, under the same conditions, the knitted fabric with an exposed rate of PBT spun yarn of 40% was superior to the knitted fabric with an exposed rate of PBT spun yarn of 28% in both pilling resistance and abrasion resistance, but the bending resistance value was slightly lower than that of the knitted fabric, i.e., the flexibility was slightly superior to the knitted fabric.

[0077] (7) From Examples 10 and 20, it was found that, under the same conditions, the spun yarn with a twist multiplier of 2.0 had better anti-pilling properties and abrasion resistance than the spun yarn with a twist multiplier of 1.8, and the bending resistance value was slightly higher than that of the latter, i.e., the flexibility was slightly lower than that of the latter.

[0078] (8) From Comparative Example 1 and Example 19, it was found that under the same conditions, the spun yarn made of PET staple fiber with an elastic recovery rate of 40% had a second-class anti-pilling property and inferior abrasion resistance to the fabric made of PET staple fiber with an elastic recovery rate of 55%.

[0079] (9) From Comparative Example 2 and Example 12, it was found that under the same conditions, the spun yarn containing 35 wt% synthetic fiber (elastic recovery rate 65%) had a second-class anti-pilling property and abrasion resistance of only 20,000 times compared with the spun yarn containing 45 wt% synthetic fiber (elastic recovery rate 65%).

Claims

1. A spun yarn characterized by containing 100 wt % of polybutylene terephthalate fibers having an elastic recovery rate of 50% or more after 10 repeated stretchings.

2. 2. The spun yarn according to claim 1, wherein the synthetic fiber has a knot strength of 2 to 6 cN / dtex.

3. 3. The spun yarn according to claim 1, wherein the twist coefficient of the spun yarn is 2.0 to 6.0, the fineness of the single fiber constituting the spun yarn is 0.5 to 4.0 dtex, and the fiber length is 35 to 110 mm.

4. 3. The spun yarn according to claim 1, wherein the spun yarn is obtained by a silo-compact spinning method, a silo-spinning method, or a compact spinning method.

5. 3. The spun yarn according to claim 1, wherein the spun yarn is obtained by a vortex spinning method.

6. A fabric comprising 40 wt % or more of the spun yarn according to claim 1 or 2.

7. 7. The fabric according to claim 6, characterized in that the fabric has an anti-pilling property of at least grade 3 according to the GB / T 4802.2:2008 standard and / or an abrasion resistance of at least 30,000 cycles according to the JIS L 1096:2010 standard, method E.

8. 7. The fabric according to claim 6, wherein the spun yarn is exposed on at least one surface of the fabric, and the exposure rate is 30% or more.

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