Textiles and heat protective clothing

Abstract

To provide a woven fabric excellent in flame retardancy and tensile strength, and to provide heat protective clothing using the woven fabric.SOLUTION: In a woven fabric in which two or more kinds of yarns different from each other in both of breaking strength and breaking elongation are used as warp and weft, the breaking strength of the fabric is brought close to the total sum of the breaking strength of a ground yarn and the breaking strength of a reinforcing yarn by bringing the breaking elongation of the ground yarn and the breaking elongation of the reinforcing yarn close to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a woven fabric having excellent flame retardancy and tensile strength, and to a heat protective garment made using said woven fabric. [Background technology]

[0002] Conventionally, fabrics containing meta-type wholly aromatic polyamide fibers have been used as heat-protective clothing, such as workwear and firefighting uniforms, due to their excellent flame retardancy. Fabrics made using blended yarns of meta-type wholly aromatic polyamide fibers and para-type wholly aromatic polyamide fibers are known to not only have high tensile strength but also to be resistant to hole formation in flame resistance tests, such as those exemplified by ISO 15025 Procedure A. Fabrics made using blended yarns of meta-type wholly aromatic polyamide fibers, para-type wholly aromatic polyamide fibers, and polybenzoxazole fibers are known to maintain their flexibility even after heat exposure. Fabrics made using stretch-break textured yarns containing para-type wholly aromatic polyamide filaments and polybenzoxazole filaments are known to have excellent tear strength (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-92209 [Patent Document 2] Japanese Patent Application Publication No. 2018-145545 Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have discovered a problem in that, in the case of a woven fabric using the above-mentioned stretch-break textured yarn as a reinforcing yarn and a yarn containing meta-type wholly aromatic polyamide fiber as a ground yarn (yarn constituting the ground weave), the tensile strength of the woven fabric does not reach the sum of the tensile strengths of the yarns used. After extensive investigation into the cause, they have found that this is because high-strength fibers such as para-type wholly aromatic polyamide fiber or polybenzoxazole fiber have extremely low elongation, while yarn containing meta-type wholly aromatic polyamide fiber has a relatively high elongation, and therefore, when measuring the tensile strength of a woven fabric containing both, the reinforcing yarn with low elongation reaches its yield point first.

[0005] The ground yarn is essential for the development of flame retardancy and heat insulation properties, and when the total tensile strength of the ground yarn in a woven fabric contributes to some extent to the total tensile strength of the reinforcing yarn, it is important to effectively develop the tensile strength of both the ground yarn and the reinforcing yarn in the woven fabric. The present invention was made based on the discovery of this new problem, and its object is to provide a woven fabric that is excellent not only in flame retardancy but also in tensile strength, and a textile product made using said woven fabric. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to achieve the above object, and as a result have completed the present invention.

[0007] Thus, the present invention provides "a woven fabric in which two or more types of yarns having different breaking strengths and breaking elongations are arranged as warp and weft yarns, and which is characterized by satisfying all of the following requirements (1) to (3)." (1) For each warp and weft thread of the woven fabric, the product of the breaking strength of each thread and the ratio of the number of threads constituting the thread is 0.2 times or more the total G of all threads for both the warp and weft threads. (2) For the warp and weft yarns of a woven fabric, when the breaking elongation of the yarn with the highest breaking elongation is E1 and the breaking elongation of the yarn with the lowest breaking elongation is E2, the value of (E1-E2) / E1 is 0.2 or less for both the warp and weft yarns. (3) For the warp and weft yarns of the fabric, when the thread density is D (threads / 2.54 cm) and the tensile strength of the fabric is T (N / 5 cm), the value of (T-(G×D×5) / (2.54×100)) / T for both the warp and weft yarns is within the range of -0.1 to 0.1.

[0008] In this case, it is preferable that the warp and weft yarns of the woven fabric have the highest breaking strength twisted together. It is also preferable that the warp and weft yarns of the woven fabric have the highest breaking strength made of long fibers or made of long fibers that have been stretch-broken. It is also preferable that the warp and weft yarns of the woven fabric have the highest breaking strength made of para-type wholly aromatic polyamide fibers or polybenzoxazole fibers, and the yarns of the woven fabric have the lowest breaking strength made of meta-type wholly aromatic polyamide fibers. The present invention also provides heat protective clothing comprising the above-described fabric. [Effects of the Invention]

[0009] According to the present invention, a fabric having excellent flame retardancy as well as tensile strength, and a textile product using the fabric, can be obtained. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing the structure of the fabric used in Example 1 and Comparative Example 1. [Figure 2] 1 is a diagram showing the structure of the fabric used in Example 2 and Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention provides a woven fabric in which two or more types (preferably 2 to 5 types, and particularly preferably 2 types) of yarns having different breaking strengths and breaking elongations are arranged as warp and weft yarns. In the present invention, the warp and weft yarns of the woven fabric having the highest breaking strength are referred to as reinforcing yarns, and the yarns having the lowest breaking strength are referred to as ground yarns.

[0012] First, in the woven fabric of the present invention, it is important that the product of the breaking strength of each warp and weft yarn and its constituent yarn ratio is 0.2 or more relative to the total G of all yarns in both the warp and weft. For example, if the breaking strength of the reinforcing yarn is S1 (cN), the breaking strength of the ground yarn is S2 (cN), and the respective constituent yarn ratios are R1 and R2 (where R1 + R2 = 1), then the value of (S1 × R1) / G is 0.2 or more, and the value of (S2 × R2) / G is 0.2 or more. However, the total G = (S1 × R1) + (S2 × R2).

[0013] The breaking strength of each yarn indicates the breaking strength of the same type of yarn, and the constituent number ratio indicates the ratio of the numbers of the same type of yarns. The "total G of all yarns" is the sum in the warp (or weft) direction of the "product of the breaking strength of each yarn and the constituent number ratio" arranged in the warp (or weft).

[0014] Furthermore, for the warp and weft yarns of a woven fabric, if the breaking elongation of the yarn with the highest breaking elongation is E1 and the breaking elongation of the yarn with the lowest breaking elongation is E2, it is important that the value of (E1-E2) / E1 for both the warp and weft yarns is 0.2 or less. If this value is greater than 0.2, the difference in elongation will be large, and there is a risk that the tensile strength of the woven fabric will not approach the sum of the tensile strength of the ground yarn and the tensile strength of the reinforcing yarn.

[0015] Furthermore, when the thread density of the warp and weft yarns of a woven fabric is D (threads / 2.54 cm) and the tensile strength of the fabric is T (N / 5 cm), it is important that the value of (T-(G×D×5) / (2.54×100)) / T for both the warp and weft yarns is within the range of -0.1 to 0.1.

[0016] In the woven fabric of the present invention, the form of the yarns (ground yarns or reinforcing yarns) constituting the warp and / or weft of the woven fabric is not particularly limited, and may be long fibers called multifilaments (assemblies of single fibers made of long fibers) or stretch-broken yarns thereof, or spun yarns (assemblies of many short fibers).

[0017] In the woven fabric of the present invention, the ground yarn is preferably a spun yarn containing meta-type wholly aromatic polyamide fiber, more preferably a spun yarn containing meta-type wholly aromatic polyamide fiber and para-type wholly aromatic polyamide fiber, and particularly preferably a spun yarn containing meta-type wholly aromatic polyamide fiber, para-type wholly aromatic polyamide fiber, and polybenzoxazole fiber.

[0018] Here, the meta-type wholly aromatic polyamide fiber is a fiber made of a polymer in which 85 mol % or more of the repeating units are m-phenylene isophthalamide. Such meta-type wholly aromatic polyamide may be a copolymer containing less than 15 mol % of a third component.

[0019] Such meta-type wholly aromatic polyamides can be produced by a conventionally known interfacial polymerization method, and the degree of polymerization of the polymer is preferably such that the intrinsic viscosity (IV) measured in an N-methyl-2-pyrrolidone solution at a concentration of 0.5 g / 100 ml is in the range of 1.3 to 1.9 dl / g.

[0020] The meta-type wholly aromatic polyamide may contain an alkylbenzenesulfonate onium salt. Preferred examples of the alkylbenzenesulfonate onium salt include hexylbenzenesulfonate tetrabutylphosphonium salt, hexylbenzenesulfonate tributylbenzylphosphonium salt, dodecylbenzenesulfonate tetraphenylphosphonium salt, dodecylbenzenesulfonate tributyltetradecylphosphonium salt, dodecylbenzenesulfonate tetrabutylphosphonium salt, and dodecylbenzenesulfonate tributylbenzylammonium salt. Among these, dodecylbenzenesulfonate tetrabutylphosphonium salt and dodecylbenzenesulfonate tributylbenzylammonium salt are particularly preferred because they are easily available, have good thermal stability, and have high solubility in N-methyl-2-pyrrolidone.

[0021] In order to obtain a sufficient effect of improving dyeability, the content of the alkylbenzenesulfonic acid onium salt is preferably 2.5 mol % or more, and more preferably in the range of 3.0 to 7.0 mol %, based on the poly-m-phenylene isophthalamide.

[0022] The poly-m-phenylene isophthalamide and the alkylbenzene sulfonate onium salt may be mixed by, for example, dissolving the poly-m-phenylene isophthalamide in a solvent and then dissolving the alkylbenzene sulfonate onium salt in the solvent. The dope thus obtained is formed into fibers by a conventionally known method.

[0023] For the purpose of improving dyeability and resistance to fading, the polymer used for meta-type wholly aromatic polyamide fibers may be copolymerized in an aromatic polyamide skeleton containing a repeating structural unit represented by the following formula (1) with an aromatic diamine component or aromatic dicarboxylic acid halide component different from the main structural unit of the repeating structure as a third component in an amount of 1 to 10 mol % relative to the total amount of repeating structural units of the aromatic polyamide. -(NH-Ar1-NH-CO-Ar1-CO)- Formula (1) Here, Ar1 is a divalent aromatic group having a linking group in a direction other than the meta-coordinate or parallel axis direction.

[0024] They can also be copolymerized as a third component, and specific examples of the aromatic diamines shown in formulas (2) and (3) include p-phenylenediamine, chlorophenylenediamine, methylphenylenediamine, acetylphenylenediamine, aminoanisidine, benzidine, bis(aminophenyl)ether, bis(aminophenyl)sulfone, diaminobenzanilide, diaminoazobenzene, etc. Specific examples of the aromatic dicarboxylic acid dichlorides shown in formulas (4) and (5) include terephthalic acid chloride, 1,4-naphthalenedicarboxylic acid chloride, 2,6-naphthalenedicarboxylic acid chloride, 4,4'-biphenyldicarboxylic acid chloride, 5-chloroisophthalic acid chloride, 5-methoxyisophthalic acid chloride, bis(chlorocarbonylphenyl)ether, etc.

[0025] H2N-Ar2-NH2...Formula (2) H2N-Ar2-Y-Ar2-NH2···Eq. (3) XOC-Ar3-COX...Formula (4) XOC-Ar3-Y-Ar3-COX...Formula (5) Here, Ar2 is a divalent aromatic group different from Ar1, Ar3 is a divalent aromatic group different from Ar1, Y is at least one atom or functional group selected from the group consisting of an oxygen atom, a sulfur atom, and an alkylene group, and X is a halogen atom.

[0026] The crystallinity of the meta-type wholly aromatic polyamide fiber is preferably 5 to 35% because it has good dye exhaustion properties and can easily adjust to a target color with less dye or under weak dyeing conditions.Furthermore, it is more preferably 15 to 25% because it is less likely to cause uneven distribution of the dye on the surface, has high resistance to discoloration, and can ensure the dimensional stability required for practical use. The amount of residual solvent in the meta-type wholly aromatic polyamide fibers is preferably 0.1 mass % or less (more preferably 0.001 to 0.1 mass %) so as not to impair the excellent flame retardancy of the meta-type wholly aromatic polyamide fibers.

[0027] As such meta-type wholly aromatic polyamide fibers, spun-dyed meta-type wholly aromatic polyamide fibers as described in WO 2013 / 061901 are preferred in order to obtain excellent light fastness. That is, examples of pigments that can be used in the present invention include organic pigments such as azo pigments, phthalocyanine pigments, perinone pigments, perylene pigments, and anthraquinone pigments, and inorganic pigments such as carbon black, ultramarine blue, red iron oxide, titanium oxide, and iron oxide, but are not limited to these.

[0028] Furthermore, methods for mixing the meta-type wholly aromatic polyamide with the pigment include, but are not limited to, a method in which an amide solvent slurry is prepared in which the pigment is uniformly dispersed in an amide solvent, and the amide solvent slurry is added to a solution in which the meta-type wholly aromatic polyamide is dissolved in an amide solvent, or a method in which the pigment powder is directly added to a solution in which the meta-type wholly aromatic polyamide is dissolved in an amide solvent.

[0029] The amount of pigment to be blended is 10.0% by mass or less, preferably 5.0% by mass or less, based on the meta-type wholly aromatic polyamide. If the amount of pigment added exceeds 10.0% by mass, the physical properties of the resulting fiber may be deteriorated. The meta-type wholly aromatic polyamide fibers described above can be produced by the following method, and in particular, the crystallinity and residual solvent content can be adjusted to the above ranges by the method described below.

[0030] The polymerization method for the meta-type wholly aromatic polyamide polymer is not particularly limited, and for example, the solution polymerization method or interfacial polymerization method described in Japanese Patent Publication No. 14399 / 1960, U.S. Pat. No. 3,360,595, Japanese Patent Publication No. 10863 / 1972, etc. may be used.

[0031] The spinning solution is not particularly limited, but may be an amide-based solvent solution containing an aromatic copolyamide polymer obtained by the above-mentioned solution polymerization or interfacial polymerization, or may be a solution obtained by isolating the polymer from the above-mentioned polymerization solution and dissolving it in an amide-based solvent.

[0032] Examples of the amide solvent used here include N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, and dimethyl sulfoxide, with N,N-dimethylacetamide being particularly preferred.

[0033] The copolymerized aromatic polyamide polymer solution obtained as described above is preferably stabilized by further containing an alkali metal salt or alkaline earth metal salt, which allows use at higher concentrations and lower temperatures. The alkali metal salt and alkaline earth metal salt are preferably contained in an amount of 1% by mass or less, more preferably 0.1% by mass or less, based on the total mass of the polymer solution. In this case, it is preferable to add a flame retardant such as those described above.

[0034] In the spinning and coagulation step, the spinning solution (meta-type wholly aromatic polyamide polymer solution or spun-dyed meta-type wholly aromatic polyamide polymer solution) obtained above is spun into a coagulation solution and coagulated.

[0035] The spinning device is not particularly limited, and a conventionally known wet spinning device can be used. In addition, the number, arrangement, and shape of the spinning holes in the spinneret do not need to be particularly limited as long as it can perform stable wet spinning. For example, a multi-hole spinneret for staple fibers having 1,000 to 30,000 holes and a spinning hole diameter of 0.05 to 0.2 mm may be used. The temperature of the spinning solution (meta-type wholly aromatic polyamide polymer solution) when spun out from the spinneret is suitably in the range of 20 to 90°C.

[0036] The coagulation bath used to obtain the fibers is an aqueous solution of an amide solvent, preferably NMP, substantially free of inorganic salts, with a concentration of 45 to 60% by mass, at a bath temperature of 10 to 50°C. If the concentration of the amide solvent (preferably NMP) is less than 45% by mass, the skin will be thick, reducing the washing efficiency in the washing step and making it difficult to reduce the amount of solvent remaining in the fibers. On the other hand, if the concentration of the amide solvent (preferably NMP) exceeds 60% by mass, uniform coagulation cannot be achieved even in the interior of the fibers, making it difficult to reduce the amount of solvent remaining in the fibers. The appropriate immersion time for the fibers in the coagulation bath is 0.1 to 30 seconds.

[0037] Subsequently, the film is stretched at a stretching ratio of 3 to 4 in a plastic stretching bath containing an amide solvent, preferably an aqueous solution of NMP with a concentration of 45 to 60% by mass, and the bath temperature is set to 10 to 50° C. After stretching, the film is thoroughly washed by passing it through an aqueous solution of NMP with a concentration of 20 to 40% by mass at 10 to 30° C., and then through a warm water bath at 50 to 70° C. The washed fibers are subjected to a dry heat treatment at a temperature of 270 to 290° C., whereby meta-type wholly aromatic aramid fibers that satisfy the above ranges of crystallinity and residual solvent amount can be obtained.

[0038] The meta-type wholly aromatic aramid fibers may be long fibers (multifilament) or short fibers. In particular, short fibers having a fiber length of 25 to 200 mm are preferred for blending with other fibers. The single fiber fineness is preferably in the range of 1 to 5 dtex.

[0039] Furthermore, as the para-type wholly aromatic polyamide fiber, paraphenylene terephthalamide fiber or coparaphenylene-3,4'-oxydiphenylene terephthalamide fiber is more preferred. In order to maintain durability against light, it is also preferable to add a pigment to such para-type wholly aromatic polyamide fiber.

[0040] Furthermore, in order to maintain the strength of the woven fabric after heat exposure, it is more preferable to blend or twist polybenzoxazole fiber with the ground yarn. In particular, from the viewpoint of flame retardancy and heat shielding properties, it is preferable that the ground yarn contains 50 to 95 mass% of the meta-type wholly aromatic polyamide fiber, 5 to 50 mass% of the para-type wholly aromatic polyamide fiber, and 5 to 30 mass% of polybenzoxazole fiber. In this case, it is preferable that the total of these fibers is 100 mass%.

[0041] Meta-type wholly aromatic polyamide fibers alone may cause holes in the flame resistance test specified in ISO 15025 Procedure A. Para-type wholly aromatic polyamide fibers alone may cause flame ignition. Polybenzoxazole fibers must be protected from severe degradation by light, and it is desirable that their content does not exceed 30% by mass of the base yarn.

[0042] In the woven fabric of the present invention, the reinforcing yarn must have excellent flame retardancy (heat resistance) and tensile strength. Examples include para-type wholly aromatic polyamide fiber and polybenzoxazole fiber. The fiber form is preferably a long fiber or a stretch-break textured yarn, which can fully demonstrate the mechanical properties of the fiber. The stretch-break textured yarn is a textured yarn obtained by stretch-breaking a long fiber, as described in JP 2007-92209 A and JP 2011-26725 A, and has appropriate elongation and strength.

[0043] The woven fabric of the present invention is required to exhibit heat resistance, flame retardancy, and tensile strength, and in order to effectively exhibit the physical properties of the reinforcing yarns as a weave, a weave with a number of plies of 2 / 1 or more is preferably used, which can avoid exposure to heat surfaces more easily than plain weave. The yarn arrangement of the warp and weft yarns is preferably such that the ratio of ground yarns to reinforcing yarns is (2-12):(1-3), and particularly preferably (3-10):1.

[0044] In the woven fabric of the present invention, it is important that the tensile strength of the woven fabric be close to the sum of the tensile strength of the ground yarn and the tensile strength of the reinforcing yarn. Therefore, it is important that the elongation of the ground yarn and the elongation of the reinforcing yarn be close to each other. If the elongation of either yarn is low, the yarn with the lower elongation will reach its yield point first when pulled, which is not preferable.

[0045] For example, when a spun yarn is used for the ground yarn and a continuous fiber made of the para-type wholly aromatic polyamide fiber or polybenzoxazole fiber is used for the reinforcing yarn, the reinforcing yarn generally has lower elongation. Therefore, it is preferable to impart elongation to the reinforcing yarn by twisting the reinforcing yarn (preferably 2 to 20 T / 2.54 cm, particularly preferably 3 to 15 T / 2.54 cm).

[0046] Such woven fabrics can be produced using, for example, a rapier loom, and may be subjected to dyeing, flame retardancy, antibacterial and deodorizing, bacteriostatic, ultraviolet shielding, water repellency, oil repellency, water absorption, and the like. The woven fabric of the present invention has the above-mentioned structure and is therefore excellent in flame retardancy, heat insulation, and tensile strength.

[0047] The textile product of the present invention is any textile product selected from the group consisting of protective clothing, fire-resistant clothing for firefighters, fire-fighting work uniforms, rescue clothing, work uniforms, happi coats, police uniforms, clothing for the Self-Defense Forces, military uniforms, racing suits, and vests, which is made using the above-mentioned woven fabric. Since such textile products use the above-mentioned fabric, they are excellent not only in flame retardancy and heat insulation but also in tensile strength. [Example]

[0048] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The physical properties in the examples were measured by the following methods. (Yarn breaking strength and breaking elongation) Based on JIS L 1095, the breaking strength and breaking elongation of each type of yarn were measured at a gripping distance of 200 mm and an extension rate of 200 / min. (fineness) Measurement was performed based on JIS L 1013. (Count) Measurement was carried out based on JIS L 1095. (Fabric weight) Measurement was carried out based on JIS L 1096. (Fabric tensile strength) Measurements were carried out in both the warp and weft directions of the fabric using test pieces 5 cm wide in accordance with JIS L 1096.

[0049] The following materials were used: (Meta-type fully aromatic polyamide dyed staple fiber) Teijin Limited's "Conex" (registered trademark), average single fiber fineness 2.2 dtex, fiber length 51 mm (hereinafter referred to as "spun-dyed meta-aramid") (Para-type fully aromatic polyamide dyed staple fiber) TWARON (registered trademark), manufactured by Teijin Limited, average single fiber fineness 1.7 dtex, fiber length 51 mm (hereinafter referred to as dope-dyed para-aramid) (Polybenzoxazole short fiber) Toyobo Co., Ltd. "ZYLON" (registered trademark), average single fiber fineness 1.7 dtex, fiber length 44 mm (hereinafter referred to as PBO) (Para-type fully aromatic polyamide continuous fiber) "Technora" (registered trademark), manufactured by Teijin Limited, average fineness 440 dtex, fiber count 267 (hereinafter referred to as para-aramid filament) (Polybenzoxazole stretch-break processed yarn) Toyobo Co., Ltd.'s "ZYLON" (registered trademark), average fineness 197.5 dtex (hereinafter referred to as PBO stretch-break processed yarn) (Ground yarn) 40% by mass of spun-dyed meta-aramid, 45% by mass of spun-dyed para-aramid, and 15% by mass of PBO were ring-spun in a conventional manner to obtain single yarns having a British cotton count of 30. Two-ply yarns were then twisted with the number of final twists shown in Table 1, and the tensile strength and elongation of the two-ply yarns were measured. (reinforcing thread) Para-aramid continuous fiber and PBO stretch-break processed yarn were used. After that, single yarns were twisted with the number of twists shown in Table 1, and the tensile strength and elongation of the untwisted and twisted yarns were measured. (weaving) Using the ground yarns and reinforcing yarns shown in Table 1, fabrics were woven in the weave shown in the weaving diagram and with the warp and weft densities shown in Table 1, and the fabrics were scoured and heat set in the usual manner.

[0050] [Examples 1 and 2, Comparative Examples 1 and 2] The tensile strength of the obtained woven fabrics, Examples 1 and 2, and Comparative Examples 1 and 2 was evaluated, and yarns were extracted from each woven fabric to measure the tensile strength and elongation of the ground yarns and reinforcing yarns, and the difference in elongation between the ground yarns and reinforcing yarns was compared. The evaluation results are shown in Table 1. As shown in the Examples, by reducing the difference in elongation between the ground yarns and reinforcing yarns, the tensile strength of the woven fabrics was significantly higher than in the Comparative Examples.

[0051] [Table 1-1]

[0052] [Table 1-2] [Industrial Applicability]

[0053] According to the present invention, a fabric and heat protective clothing having excellent flame retardancy and tensile strength are provided, and the industrial value thereof is extremely great.

Claims

1. A woven fabric in which two or more types of yarns having different breaking strengths and breaking elongations are arranged as warp and weft yarns, the woven fabric satisfying all of the following requirements (1) to (3), and characterized in that the yarn having the greatest breaking strength among the warp and weft yarns of the woven fabric is a twisted yarn made of long fibers. (1) For each of the warp and weft yarns of the woven fabric, the product of the breaking strength of each yarn and the ratio of the number of constituent yarns is 0.2 times or more relative to the total G of all yarns for both the warp and weft yarns. (2) For the warp and weft yarns of a woven fabric, when the breaking elongation of the yarn with the largest breaking elongation is E1 and the breaking elongation of the yarn with the smallest breaking elongation is E2, the value of (E1-E2) / E1 is 0.2 or less for both the warp and weft yarns. (3) For each of the warp and weft yarns of the woven fabric, when the thread density is D (threads / 2.54 cm) and the tensile strength of the woven fabric is T (N / 5 cm), the value of (T-(G x D x 5) / (2.54 x 100)) / T for both the warp and weft yarns is within the range of -0.1 to 0.

1.

2. 2. The woven fabric according to claim 1, wherein the warp and weft yarns having the highest breaking strength contain para-type wholly aromatic polyamide fibers or polybenzoxazole fibers, and the warp and weft yarns having the lowest breaking strength contain meta-type wholly aromatic polyamide fibers.

3. Heat-protective clothing comprising the fabric described in claim 1 or 2.

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