Flame-retardant spun yarn, and flame-retardant fabric and flame-retardant protective clothing containing the same

Abstract

To provide a fire retardant bundle spun yarn having high anti-pilling property and a fire retardant fabric and a fire retardant protective clothing that contain the same.SOLUTION: A fire retardant bundle spun yarn 1 is mainly formed of aramid fibers. Inner fibers 2 of the fire retardant bundle spun yarn 1 are aligned in a yarn length direction in relatively less twisted state compared to winding fibers 3 of a surface layer. The winding fiber 3 of the surface layer is in a real twisted state in which twist is applied in one direction. The winding fiber 3 of the surface layer bundles the inner fibers 2. The number of fuzz per 10 m of single yarn length of the fire retardant bundle spun yarn 1 is 0.1 or more and 10 or less in length of 3 mm or more, and 0 to 1 in length of 5 mm or more. A fire retardant fabric uses two-folded yarn of the fire retardant bundle spun yarn in warp and weft. A fire retardant protective clothing contains the fire retardant fabric.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flame-retardant spun yarn containing aramid fibers, and a flame-retardant fabric and flame-retardant protective clothing containing the same. [Background technology]

[0002] Flame-retardant protective clothing is used as workwear for firefighters, ambulance crews, lifeguards, marine rescue workers, the military, workers at oil-related facilities, chemical plant workers, etc. Traditionally, aramid fibers have been used in these flame-retardant protective clothing. Patent Document 1 proposes a spun yarn with intermittent bundling points, which is obtained by spinning a blended fiber consisting of 95% by mass of meta-aramid fiber (meta-type wholly aromatic polyamide fiber) and 5% by mass of para-aramid fiber (para-type wholly aromatic polyamide fiber) using two swirling jets or twisting bodies arranged in series that impart false twist in opposite directions. Patent Document 2 proposes a fabric in which yarn A with a large heat shrinkage rate and yarn B with a small heat shrinkage rate are alternately arranged in the warp or weft direction, where yarn A with a large heat shrinkage rate contains 50% by weight or more of meta-aramid fiber and yarn B with a small heat shrinkage rate contains 50% by weight or more of para-aramid fiber, and the fabric develops a concave-convex structure when exposed to flame or heat. It has also been proposed that yarns A and B be produced using an air jet spinning machine (Patent Document 2

[0043] ). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-40068 [Patent Document 2] Re-tabled publication No. 2017-175632 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the fabric of Patent Document 1 has a pilling resistance of grade 3.5 (Table 1), which is a problem of low anti-pilling property. Also, the fabric of Patent Document 2 has a problem of the yarn containing a large amount of para-aramid fiber being worn away by washing, etc.

[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides a flame-retardant spun yarn having low fuzz and high anti-pilling properties, and a flame-retardant fabric and flame-retardant protective clothing containing the same. [Means for solving the problem]

[0006] The flame-retardant spun bundle yarn of the present invention is a flame-retardant spun bundle yarn containing aramid fibers as a main component, The inner fibers of the flame-retardant spun yarn are arranged in the yarn length direction with a relatively small twist compared to the wound fibers of the surface layer, The flame-retardant bundled spun yarn has no intermittent binding points, and the wound fibers in the surface layer are twisted in one direction in a true twist state; The wound fibers of the surface layer bundle the internal fibers, and the internal fibers and the surface layer fibers are intertwined from the surface to the inside due to migration, The number of fluffs per 10 m of the flame-retardant spun single yarn is 0.1 to 10 for a length of 3 mm or more, and 0 to 1 for a length of 5 mm or more, The flame-retardant spun yarn contains aramid fibers and antistatic fibers, and the amount of meta-aramid fibers is more than 80 parts by mass and 100 parts by mass or less, and the amount of para-aramid fibers is 4 parts by mass or more and less than 20 parts by mass, relative to 100 parts by mass of the total amount of aramid fibers, The antistatic fiber 0.3 to 0.7 parts by mass blended with flame-retardant spun yarn It is characterized by:

[0007] The flame-retardant fabric of the present invention uses the above-mentioned flame-retardant shied spun yarn as the warp and weft.

[0008] The flame-retardant protective clothing of the present invention comprises the flame-retardant fabric described above. [Effects of the Invention]

[0009] The present invention provides a flame-retardant tyre spun yarn whose main component is aramid fiber, wherein the internal fibers of the flame-retardant tyre spun yarn are arranged in the yarn length direction with relatively less twist than the wrapping fibers of the surface layer, the wrapping fibers of the surface layer are twisted in one direction to form a true twist, and the wrapping fibers of the surface layer bundle the internal fibers, and the number of fluffs per 10 m of the single yarn of the flame-retardant tyre spun yarn is 0.1 to 10 fluffs for lengths of 3 mm or more and 0 to 1 fluff for lengths of 5 mm or more, thereby providing a flame-retardant tyre spun yarn with little fluff and high anti-pilling properties, as well as a flame-retardant fabric and flame-retardant protective clothing containing the same. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic external view of a flame-retardant yam of a single yarn of a yam of a yam according to one embodiment of the present invention. [Figure 2] Figure 2 is a photograph of the appearance of the single yarn (microscope magnification 200x). [Figure 3] Figure 3 is a photograph (microscope magnification 200x) of the appearance of the fuzzy part of the single yarn. [Figure 4] Figure 4 is a photograph of the appearance of the two-ply yarn (microscope magnification 200x). DETAILED DESCRIPTION OF THE INVENTION

[0011] The flame-retardant spun yarn of the present invention is a flame-retardant spun yarn containing aramid fiber as the main component. The aramid fiber is at least one fiber selected from meta-aramid fiber and para-aramid fiber. Preferably, meta-aramid fiber is the main component fiber and para-aramid fiber is the secondary component fiber. In the above, "main component" means more than 50% by mass. By using aramid fiber as the main component, it is possible to provide spun yarn, woven fabric, and protective clothing with high heat resistance and flame retardancy.

[0012] The flame-retardant bundled spun yarn has a structure in which the inner fibers are arranged in the yarn length direction with relatively less twist than the wrapping fibers in the surface layer, the wrapping fibers in the surface layer are twisted in one direction, and the wrapping fibers in the surface layer bundle the inner fibers. For example, the inner fibers are arranged in the yarn length direction with no twist or nearly no twist, and the wrapping fibers in the surface layer are wrapped in one direction and bundle the inner fibers. The inner and surface fibers are intertwined from the surface to the inside due to migration. The appearance of the spun yarn is a twisted, wrapped, and true-twisted spun yarn. This spun yarn can be produced using the spinning machine described in Japanese Patent No. 2806380. This spinning machine is manufactured by Murata Machinery Co., Ltd. and sold under the product name "MURATA VORTEX SPINNER." This spinning machine is different from the spinning machine described in Patent Document 1. The spun yarn described in Patent Document 1 has intermittent binding points, but the spun yarn of the present invention has no intermittent binding points and is a true-twist spun yarn, and its yarn structure is also different. The flame-retardant typified spun yarn of the present invention has little fuzz, and the woven fabric has good pilling resistance. This is due to the yarn structure of the typified spun yarn described above and the synergistic effect of using stiff aramid fibers as the main component. As a result, fuzz is low, fibers do not fall off even when worn, and the yarn maintains a strong state. In the above, "unidirectional" refers to S-twist wrapped fibers or Z-twist wrapped fibers, and does not mean that the twist angle is the same. Whether the wrapped fibers are S-twisted or Z-twisted is determined by the direction of the compressed air swirl flow in the spinner of the spinning machine.

[0013] The number of fluffs per 10 m of the flame-retardant spun single yarn is 0.1 to 10 for lengths of 3 mm or more, and 0 to 1 for lengths of 5 mm or more. Preferably, the number of fluffs per 10 m of the yarn is 50 to 250 for lengths of 1 mm or more, 0.5 to 10 for lengths of 3 mm or more, and 0 to 0.5 for lengths of 5 mm or more. The reason for the low fluff is as described above.

[0014] The flame-retardant spun yarn is preferably a blended spun yarn containing aramid fiber and antistatic fiber. (1) When the amount of aramid fiber is 100 parts by mass, the amount of meta-aramid fiber is preferably 70 to 100 parts by mass, more preferably 75 to 97 parts by mass, and even more preferably 80 to 96 parts by mass. (2) When the aramid fibers are taken as 100 parts by mass, the amount of the para-aramid fibers is preferably 0 to 30 parts by mass, more preferably 3 to 25 parts by mass, and even more preferably 4 to 20 parts by mass. (3) The amount of antistatic fiber is 0.1 to 1 part by mass, preferably 0.2 to 0.8 parts by mass. In the above, meta-aramid fiber is used as the main component to enhance flame retardancy, and a small amount of para-aramid fiber is added to enhance strength. Antistatic fiber is blended to prevent ignition due to static electricity.

[0015] Examples of meta-aramid fibers used as the main component fiber in the present invention include those manufactured by DuPont in the United States under the trade name "Nomex" (the same trade name is also used by Toray DuPont in Japan), those manufactured by Teijin Limited under the trade name "Conex," and those manufactured by Yantai Taiho Co., Ltd. in China under the trade name "Newstar." The tensile strength of "Nomex" is 3.6 cN / decitex, the thermal decomposition starting temperature is approximately 400°C, and the oxygen index (OI) is 29-30.

[0016] Para-aramid fibers include homopolymers manufactured by DuPont in the United States under the trade name "Kevlar" (the same trade name is also used by Toray DuPont in Japan), Teijin under the trade name "Twaron" (registered trademark), and Yantai Taiwa under the trade name "Taparan," while copolymers are manufactured by Teijin under the trade name "Technora." These fibers have a tensile strength of 20.3-24.7 cN / decitex, a thermal decomposition temperature of approximately 500°C, and an oxygen index (OI) of 25-29. Their heat resistance and flame retardancy are higher than those of ordinary fibers.

[0017] The flame-retardant spun yam may be further blended with other fibers. When blending with other fibers, the amount of the other fibers is preferably 5 to 50 parts by mass per 100 parts by mass of the flame-retardant spun yam. The other fibers are preferably at least one fiber selected from polyester, wool, rayon, cotton, vinylon, acrylic, polyetherimide, blends thereof, and flame-retardant fibers thereof. The other fibers referred to here include unmodified fibers and commercially available regular fibers. These fibers are added for various advantages, such as improved comfort, ease of dyeing, and cost reduction.

[0018] The flame-retardant fibers include the following: (1) Flame-retardant polyester fiber Examples of flame-retardant polyester fibers include "Super Ecstar" manufactured by Teijin Frontier Co., Ltd., "Unfla" manufactured by Toray Industries, Inc., "Heim" manufactured by Toyobo Co., Ltd., "Honoguard" manufactured by Unitika Trading Co., Ltd., and "Moeny" manufactured by Seiren Co., Ltd. (2) Flame-retardant wool Flame-retardant wool is typically made from merino wool and is treated with titanium and zirconium salts, a process known as "zapro processing." Unmodified wool may be used, or wool may be treated with scale removal and shrink-proofing. The reason for using unmodified or modified wool is that it improves moisture absorption, blocks radiant heat, and provides comfort even when wet from sweating during work in harsh, high-temperature environments, providing heat resistance for personal protection. The oxygen index (OI) is 27-33. (3) Flame-retardant rayon Examples of flame-retardant rayon include Proban processing (an ammonia-curing process using tetrakishydroxymethylphosphonium salt developed by Albright & Wilson), Pyropatex CP processing (N-methyloldimethylphosphonopropionamide processing) developed by Ciba-Geigy, and "Viscose FR" (a trade name of Lenzing AG, Austria). The oxygen index (OI) is 26. (4) Flame-retardant cotton Flame-retardant cotton such as Proban processed (a process in which tetrakishydroxymethylphosphonium salt is attached to cotton using the ammonia curing method) and Pyropatex CP processed (N-methyloldimethylphosphonopropionamide processed) can be used. The oxygen index (OI) is 26. (5) Flame-retardant acrylic fiber Acrylic fibers made by copolymerizing acrylonitrile with vinyl chloride monomers as a flame retardant can be used. Products include Kaneka's "Protex" brand. The oxygen index (OI) is 29-37. (6) Other An example of a flame-retardant vinylon is "Vinal" manufactured by Kuraray Co., Ltd. An example of a polyetherimide fiber is "PEI Fiber Kurakis" manufactured by Kuraray Co., Ltd. An example of a blended fiber is "Protexa FR" manufactured by Unitika Trading Co., Ltd. (a blend of flame-retardant vinylon and flame-retardant cotton).

[0019] Antistatic fibers to be blended into the flame-retardant spun yarn of the present invention include metal fibers, carbon fibers, and fibers kneaded with metal or carbon particles. The antistatic fibers are preferably added in an amount of 0.1 to 1% by mass, more preferably 0.3 to 0.7% by mass, based on the spun yarn. Antistatic fiber yarns can also be added during weaving. For example, it is preferable to add 0.1 to 1% by mass of "Belltron" manufactured by KB Seiren, "Clacarbo" manufactured by Kuraray, carbon fibers, metal fibers, etc.

[0020] The flame-retardant spun yarn (single yarn) preferably has a metric count in the range of 28 to 76 (28 to 76 m / g, fineness: 357 to 132 decitex), which allows for the production of protective clothing with good workability.

[0021] The woven fabric of the present invention is made by twisting two of the flame-retardant spun yarns (single yarns) together to form a two-ply yarn, which is then woven into a fabric. The reason for using two-ply yarn is that it has a strength more than twice that of a single yarn, imparts a cohesive force that prevents yarn breakage during weaving, and offsets the thickness variations of the single yarns, resulting in a neat weave. Two-ply yarns are produced, for example, using a twisting machine such as a double twister. As the name suggests, a double twister provides two twists with one rotation of the spindle, making it highly productive. Twisting is preferably performed using a ring twister, and most preferably an up twister.

[0022] The metric count of the two-ply yarn is preferably in the range of 14 to 38 (14 to 38 m / g, fineness: 714 to 264 decitex). The twist coefficient K of the two-ply yarn is preferably 100 to 200, more preferably 110 to 190. The twist coefficient K of the two-ply yarn is calculated by the following formula. K=T / √C Here, T represents the number of twists of the two-ply yarn (turns / m), and C represents the two-ply yarn count (m / g). Within the above range, the twist structure is stable, the yarn wrapping property is high, and furthermore, a woven fabric with a fine texture and a soft feel can be obtained.

[0023] The obtained two-fold yarn is twisted and used as the warp and weft to make a woven fabric. The weave may be plain weave, twill weave (also called twill weave), satin weave, or other variations of the weave. When knitting, any of flat knitting, circular knitting, and warp knitting may be used. Any knitting structure may be used. When air is to be incorporated into the knitted fabric, it is knitted into a double-knit pile fabric. Among the weave structures, a 2 / 2 twill structure is particularly preferred. This structure has good resistance to flat friction.

[0024] The weight per unit area of ​​the fabric of the present invention (basis weight) is 100 to 340 g / m 2 Within this range, the work clothes can be made even lighter and more comfortable to wear. More preferably, it is 140 to 300 g / m 2In particular, the range of 180 to 260 g / m 2 The range is.

[0025] The flame-retardant woven fabric of the present invention is a woven fabric in which the above-mentioned flame-retardant spun yarn is used as the warp and weft. The flame-retardant woven fabric preferably has a pilling resistance of Grade 4 or higher after 10 hours, more preferably Grade 4 or higher after both 10 hours and 20 hours, and even more preferably Grade 4 or higher after 10 hours, 20 hours, and 30 hours, as measured in accordance with JIS L1076.8.11 (Method A). This allows for the provision of flame-retardant protective clothing that can be used for a long period of time without causing poor appearance.

[0026] The protective clothing of the present invention is suitable as work clothing for emergency personnel, rescuers, marine rescue personnel, the military, workers at oil-related facilities, and chemical plant workers, in addition to firefighting clothing.

[0027] The following description will be given with reference to the drawings. Figure 1 is a trace of Figure 2, and is a schematic external view of a single yarn of a flame-retardant typified spun yarn 1 according to one embodiment of the present invention. In this flame-retardant typified spun yarn 1, the internal fibers 2 are arranged in the yarn length direction with relatively less twist than the wrapping fibers 3 in the surface layer, and the wrapping fibers 3 in the surface layer are twisted in one direction, forming a true twist, and the wrapping fibers 3 in the surface layer bundle the internal fibers 1. Overall, the yarn has very little fuzz. Figure 2 is a photograph (microscope magnification 200x) of the appearance of a single yarn according to one embodiment of the present invention. Figure 3 is a photograph (microscope magnification 200x) of the appearance of a fluffy portion of the single yarn. Figure 4 is a photograph (microscope magnification 200x) of the appearance of a two-ply yarn according to the same embodiment. [Example]

[0028] The present invention will be explained in more detail below using examples, but the present invention is not limited to the following examples. The measurement methods in the examples and comparative examples of the present invention were as follows. <Number of fluffs in spun yarn> According to JIS L1095 9.22 B method, fluff of 1 mm, 3 mm and 5 mm was measured over a 10 m length using a fluff measuring tester (F-Index Tester manufactured by Shikishima Boseki Co., Ltd.). <Irregularities in spun yarn> U% was measured using a Wooster unevenness tester in accordance with JIS L1095 (2010) 9.20 A method. <Pilling test> Pilling resistance was measured after 10, 20, and 30 hours in accordance with JIS L1076.8.11 (Method A). The rating ranges from Grade 1 to Grade 5, with the higher the rating, the better the anti-pilling property. Grades between Grade 4 and Grade 5 are displayed as "Grade 4-5." <Other physical properties> Measurements were made in accordance with JIS or industry standards.

[0029] Example 1 1. Fiber used (i) Meta-aramid fiber Meta-aramid fiber (product name: Newstar BL3 manufactured by Yantai Taiwa, fineness 1.7 decitex, fiber length 51 mm square cut) was used at 79.5% by mass. (ii) Para-aramid fiber Yantai Taiwa's product name "Taparan BK-2" (fiber length 51 mm square cut, fineness 1.7 decitex) was used in an amount of 5% by mass. (iii) Commercially available regular polyester fiber 15% by mass of "Tetoron" (fiber length 51 mm square cut, fineness 3.3 decitex), manufactured by Teijin Limited, was used. (iv) Antistatic fibers 0.5% by mass of KB Seiren's product name "Beltron", single fiber fineness 3.0 decitex, fiber length: 51 mm square cut, black dope dyed product was used. The four components were blended in a blending process. 2. Spun yarn (1) Preparation of single yarn for spun yarn A single bundled spun yarn was produced at a speed of 420 m / min using a Murata Machinery Co., Ltd. product name "No. 870, MURATA VORTEX SPINNER." The metric count of the resulting yarn was 60. Figure 2 shows a photograph (microscope magnification 200x) of the appearance of this flame-retardant single bundled spun yarn. (2) Preparation of two-ply yarn Two single spun yarns were twisted together using a double twister to form a two-ply yarn. The twist number was 770 times / m and the twist coefficient K was 141. Figure 4 A photograph (microscope magnification 200x) of the appearance of this flame-retardant two-ply spun yarn is shown in Figure 1. 3. Fabric Preparation The two-fold yarn was used as the warp and weft to produce a 2 / 2 twill fabric using a rapier loom.

[0030] Example 2 , reference example ) 1. Fiber used (i) Meta-aramid fiber Meta-aramid fiber (product name: Newstar BL3 manufactured by Yantai Taiwa, fineness 1.7 decitex, fiber length 51 mm square cut) was used at 59.5% by mass. (ii) Flame-retardant rayon 25% by mass of "Viscose FR" (fiber length 51 mm square cut, fineness 2.2 decitex) manufactured by Lenzing was used. (iii) Commercially available regular polyester fiber 15% by mass of "Tetoron" (fiber length 51 mm square cut, fineness 3.3 decitex), manufactured by Teijin Limited, was used. (iv) Antistatic fibers 0.5% by mass of KB Seiren's product name "Belltron", single fiber fineness 3.0 decitex, fiber length: 51 mm square cut, black dope dyed product was used. The four components were blended in a blending process. 2. Spun yarn (1) Preparation of single yarn for spun bundle A single spun yarn was produced at a speed of 420 m / min using a Murata Vortex Spinner (product name: No. 870) manufactured by Murata Machinery Co., Ltd. The metric count of the resulting yarn was 60. (2) Preparation of two-ply yarn Two single spun yarns were twisted together using a double twister to form a two-ply yarn. The twist number was 770 times / m and the twist coefficient K was 141. 3. Fabric Preparation The two-ply yarn was used as the warp and weft to produce a 2 / 2 twill fabric using a rapier loom.

[0031] Example 3 1. Fiber used (i) Meta-aramid fiber Meta-aramid fiber (product name: Newstar RW manufactured by Yantai Taiwa, fineness 1.7 decitex, fiber length 51 mm square cut) was used at 84.5% by mass. (ii) Para-aramid fiber Yantai Taiwa's product name "Taparan BK-2" (fiber length 51 mm square cut, fineness 1.7 decitex) was used at 15% by mass. (iii) Antistatic fibers 0.5% by mass of a black dope-dyed fiber manufactured by KB Seiren Co., Ltd., trade name "Beltron", single fiber fineness 3.0 decitex, fiber length: 51 mm square cut, was used. The four components were blended in a blending process. 2. Spun yarn (1) Preparation of single yarn for spun yarn A single spun yarn was produced at a speed of 420 m / min using a Murata Vortex Spinner (product name: No. 870) manufactured by Murata Machinery Co., Ltd. The metric count of the resulting yarn was 48. (2) Preparation of two-ply yarn Two single spun yarns were twisted together using a double twister to form a two-ply yarn. The twist number was 690 times / m and the twist coefficient K was 141. 3. Fabric Preparation The two-ply yarn was used as the warp and weft to produce a 2 / 1 twill fabric using a rapier loom.

[0032] (Comparative Example 1) The same procedure as in Example 1 was carried out except that a ring spinning machine was used to produce spun yarn, the number of twists per meter was set to 640 / m, and the results are shown in Tables 1 and 2. The conditions and results for the spun yarn are shown in Tables 1-3, and the conditions and results for the woven fabric are shown in Tables 4-6.

[0033] (Comparative Example 2) The same procedure as in Example 2 was carried out except that a ring spinning machine was used to produce spun yarn, the number of twists per meter was set to 640 / m, and the results are shown in Tables 1 and 2. The conditions and results for the spun yarn are shown in Table 1, and the conditions and results for the woven fabric are shown in Table 2.

[0034] [Table 1]

[0035] [Table 2]

[0036] [Table 3]

[0037] As is clear from Tables 1-3, the shied spun yarn single yarn of Example 1 had less fuzz than the ring spun yarn single yarn. This is thought to be due to the yarn structure of the shied spun yarn of this example and the fact that it contains stiff aramid fiber as the main component, and it was confirmed that fuzz was reduced due to the migration of the fibers that make up the shied spun yarn (a structure in which the constituent fibers are intertwined from the surface to the interior).

[0038] [Table 4]

[0039] [Table 5]

[0040] [Table 6]

[0041] Table 4-6 reveals the following: (1) The fabrics made from the shied spun yarns of Examples 1-3 have good anti-pilling properties. This is thought to be due to the yarn structure of the shied spun yarns and the fact that they are mainly composed of rigid aramid fibers, as described above. That is, due to the true twist migration of the fibers that make up the shied spun yarns (a structure in which the constituent fibers are intertwined from the surface to the interior), the fibers do not fall off even when subjected to wear, and the yarn remains strong. (2) The woven fabric made of the shied spun yarn of Example 1 has a superior char length in both warp and weft in the flammability test compared to Comparative Example 1. This is also thought to be due to the strong yarn structure. [Industrial Applicability]

[0042] Protective clothing using the fabric of the present invention is suitable as work clothing for emergency personnel, rescuers, marine rescue personnel, the military, workers at oil-related facilities, and chemical plant workers, in addition to firefighting clothing. [Explanation of symbols]

[0043] 1. Flame-retardant spun yarn 2. Internal Fiber 3 Surface wrapped fibers

Claims

1. A flame-retardant spun yarn mainly composed of aramid fibers, The inner fibers of the flame-retardant spun yarn are arranged in the yarn length direction with a relatively small twist compared to the wound fibers of the surface layer, The flame-retardant bundled spun yarn has no intermittent binding points, and the wound fibers in the surface layer are twisted in one direction in a true twist state; The wound fibers of the surface layer bundle the internal fibers, and the internal fibers and the surface layer fibers are intertwined from the surface to the inside due to migration, The number of fluffs per 10 m of the flame-retardant spun single yarn is 0.1 to 10 for a length of 3 mm or more, and 0 to 1 for a length of 5 mm or more, the flame-retardant spun yarn contains aramid fibers and antistatic fibers, and the amount of meta-aramid fibers is more than 80 parts by mass and 100 parts by mass or less, and the amount of para-aramid fibers is 4 parts by mass or more and less than 20 parts by mass, relative to 100 parts by mass of the total amount of the aramid fibers; The flame-retardant spun bundle yarn is characterized in that the antistatic fiber is blended with the flame-retardant spun bundle yarn in an amount of 0.3 to 0.7 parts by mass.

2. The flame-retardant tying yarn according to claim 1, wherein the flame-retardant tying yarn further contains other fibers, and the other fibers are in the range of 5 to 50 parts by mass when the flame-retardant tying yarn is taken as 100 parts by mass.

3. 3. The flame-retardant spun yarn according to claim 1 or 2, wherein the other fiber is at least one fiber selected from polyester, wool, rayon, cotton, vinylon, acrylic, polyetherimide, blends thereof, and these flame-retardant fibers.

4. The flame-retardant tyre spun yarn according to any one of claims 1 to 4, wherein the metric count of the flame-retardant tyre spun yarn single yarn is 28 to 76.

5. The flame-retardant tying yarn according to any one of claims 1 to 4, wherein the flame-retardant tying yarn is a two-ply yarn formed by twisting two filaments together, and the metric count of the two-ply yarn is 14 to 38.

6. The flame-retardant tyre spun yarn according to any one of claims 5 to 7, wherein the twist coefficient K of the two-ply yarn is 100 to 200. The coefficient K is calculated using the following formula (1). K=T / √C...Formula (1) T: Number of twists of two-ply yarn (twists / m) C: Two-ply yarn count (m / g)

7. A flame-retardant fabric in which two-ply yarns of the flame-retardant tyre spun yarn according to any one of claims 1 to 6 are arranged as warp and weft yarns.

8. 8. The flame-retardant fabric according to claim 7, wherein the flame-retardant fabric has a pilling resistance of grade 4 or higher after 10 hours, as measured in accordance with JIS L1076.8.11 (method A).

9. A flame retardant protective garment comprising the flame retardant fabric of claim 7 or 8.

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