Classifications

• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
  • A41D13/01—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with reflective or luminous safety means
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/02—Layered materials
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/08—Heat resistant; Fire retardant
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/18—Elastic
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D11/00—Double or multi-ply fabrics not otherwise provided for
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
  • D03D15/513—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads heat-resistant or fireproof

Definitions

• the present invention relates to a flame-retardant multi-layered fiber structure, clothing and work clothes.
• the cellulosic fiber mainly used for the back structure does not have flame retardancy and is used as work clothes worn in a work place where there is a possibility of being exposed to fire. That is difficult. Further, in the technique disclosed in Patent Document 2, sufficient flame retardancy could not be obtained probably because it is basically composed of a double woven fabric having two layers of a front structure and a back structure.
• Patent Documents 3 and 4 are basically composed of a single layer, it is very difficult to achieve both flame retardancy and high visibility on one cloth.
• an object of the present invention is to use a fiber structure having high flame retardancy and excellent comfort and visibility, and using the fiber structure. To provide clothing and work clothes.
• the present inventors have set the air permeability of the fiber structure and the mass ratio of the modaacrylic short fiber that emits a self-extinguishing gas to the entire fiber structure within a specific range. By doing so, it was found that the amount of self-extinguishing gas generated when the fiber structure was ignited could be adjusted to an appropriate amount, and it was found that the flame retardancy could be improved. Furthermore, it was also found that the visibility can be easily improved by making the structure of the fiber structure a three-layer structure.
• the multi-layered fiber structure of the present invention is a multi-layered fiber structure having at least a surface layer, a knot layer and a back surface layer, and the surface layer is one or more fibers selected from polyester fibers and acrylic fibers. It is a fiber structure layer made of A, and the back surface layer is a fiber structure layer made of a composite spun yarn made by blending moda acrylic short fibers B, and the mass ratio of the moda acrylic short fibers B in the multilayer structure fiber structure is high. It is 30 to 70% by mass, the air permeability of the multilayer structure fiber structure is 5 to 60 cm 3 / (cm 2 ⁇ sec), and the cover factor is 1800 to 2500.
• the fiber A is a polyester fiber.
• the polyester fiber is a cationic dyeable polyester fiber.
• the content mass ratio of the cationic dyeable polyester fiber in the multilayer structure fiber structure is 30% by mass or more.
• the composite spun yarn contains carbonized fibers C other than modal acrylic short fibers B.
• the content mass ratio of the modal acrylic short fiber B in the composite spun yarn is 60% by mass or more.
• the multilayer structure fiber structure further contains elastic fibers, and the content mass ratio of the elastic fibers in the multilayer structure fiber structure is 1 to 10. It is mass%.
• the elongation rate of the multilayer structure fiber structure is 5% or more.
• the multilayer structure fiber structure of the present invention is measured by "8.5 E method (oxygen index method test) E-2" of JIS L1091: 1999 "Fiber product flammability test method”.
• the OI value is 26% or more.
• At least a part of the surface layer is colored with a fluorescent color.
• the clothing of the present invention is composed of the above-mentioned multilayer structure fiber structure.
• work clothes of the present invention are made of the above-mentioned multilayer structure fiber structure.
• a multilayer structure fiber structure having high flame retardancy (residual flame time, residual dust time, combustion area) and excellent comfort and visibility can be obtained.
• the multilayer structure fiber structure of the present invention is suitable as work clothes because it can work safely even in a place exposed to fire or the like, at night or in a dark place due to the above-mentioned characteristics. Can be used for.
• the multilayer structure fiber structure of the present invention is a multilayer structure fiber structure having at least a surface layer, a knot layer, and a back surface layer, and the surface layer is one or more selected from polyester fibers and acrylic fibers. It is a fiber structure layer made of fibers A, and the back surface layer is a fiber structure layer made of a composite spun yarn made by blending moda acrylic short fibers B, and is a flame-retardant short fiber B in the multilayer structure fiber structure.
• the content mass ratio is 30 to 70% by mass
• the air permeability of the multilayer structure fiber structure is 5 to 60 cm 3 / (cm 2 ⁇ sec)
• the cover factor is 1800 to 2500.
• the multilayer fiber structure of the present invention has at least a surface layer. The details will be further described below.
• the surface layer according to the present invention is a fiber structure layer composed of one or more fibers A selected from polyester fibers and acrylic fibers. This surface layer becomes the outermost layer when used as clothing or work clothes, and in particular, becomes a layer that contributes to visibility at night or in a dark place.
• polyester fibers that can be dyed with a disperse dye
• acrylic fibers that can be dyed with a cationic dye
• cationic dyeable polyester fibers are preferable, and cationic dyeable polyester fibers are more preferable. By doing so, the texture and fastness of the multi-layered fiber structure can be improved.
• the cationic dyeable polyester fiber is a polyester fiber modified so that it can be dyed with a cationic dye, and is a polyester fiber obtained by copolymerizing a dyed seat of the cationic dye.
• Typical examples include cationic dyeable fibers "LOC”, “LOCII” and “Polyloft (registered trademark)” manufactured by Toray Industries, Inc.
• the content mass ratio of the cationic dyeable polyester fiber in the multilayer structure fiber structure is 30% by mass or more.
• this content is set to 30% by mass or more, more preferably 45% by mass or more and 60% by mass or less, high visibility and light fastness can be improved.
• the chromaticity within the color coordinates of JIS T8127: 2015 can be obtained.
• the surface layer according to the present invention it is preferable that at least a part of the surface layer is colored in a fluorescent color. By doing so, the visibility when used as work clothes can be improved.
• the state of being "colored in fluorescent color” in the present invention means that as a result of coloring the surface layer, the chromaticity coordinates (x, y) of the surface layer and the brightness rate ⁇ are ISO 20471: 2013 "high”. Visibility Clothes-Fluorescent within the range of Fluorescent Yellow, Fluorescent Orange Red, Fluorescent Red specified in “Test Methods and Requirements” or Fluorescent specified in JIS T8127: 2015 "High Visibility Safety Clothing” Fluorescent green, fluorescent yellow green, fluorescent yellow orange, fluorescent orange within the range of yellow, fluorescent orange red, fluorescent red, or specified in JSAA 2001: 2017 "High visibility safety clothing standard for general users” , Fluorescent pink, fluorescent blue, or fluorescent violet.
• the state of being colored in fluorescent yellow of ISO 20471: 2013 is determined by performing an evaluation test specified in ISO 20471: 2013 and performing chromaticity coordinates (x, y) :( 0.387, 0.610). , (0.356, 0.494), (0.398, 0.452), (0.460, 0.540), the chromaticity measurement result is within the range surrounded by four points, and It means that the measurement result of the chromaticity rate ⁇ is in a state of exceeding 0.70.
• the fiber A such as polyester fiber used for the surface layer of the present invention preferably has a fineness of 0.8 to 6.0 dtex.
• the fineness of fiber A such as polyester fiber is 0.8 dtex or more, more preferably 1.5 dtex or more, or the fineness of fiber A such as polyester fiber is 6.0 dtex or less, more preferably 3.0 dtex or more.
• the fiber A such as the polyester fiber used for the surface layer of the present invention preferably has a fiber length of 15 mm to 150 mm.
• a round cross-section fiber as the fiber A such as the polyester fiber used for the surface layer of the present invention.
• the fiber A such as the polyester fiber used for the surface layer of the present invention.
• the polyurethane elastic fiber refers to a fiber made of a long-chain synthetic polymer formed by urethane bonding, and the fineness of the polyurethane elastic fiber used may be arbitrarily selected according to a desired stretch force and stretchback property.
• “Lycra (registered trademark)” manufactured by Toray Operontex Co., Ltd. may be mentioned, and those having chlorine resistance and deodorant functions may be selected.
• the multilayer structure fiber structure of the present invention has at least a back surface layer in addition to the above-mentioned front surface layer. The details will be further described below.
• the back surface layer according to the present invention is a fiber structure layer made of a composite spun yarn obtained by blending moda acrylic short fibers B. This back surface layer is the innermost layer (the layer on the human body side) when used as clothing such as work clothes.
• the composite spun yarn used in the present invention is made by blending at least modal acrylic short fibers B.
• Moda acrylic fibers are preferable because they are excellent in self-extinguishing gas generation effect and effect as carbonized fibers described later.
• the composite spun yarn preferably further contains carbonized fibers C other than modal acrylic short fibers B.
• the carbonized fiber is a fiber that does not melt at the time of combustion but carbonizes.
• the above-mentioned moda acrylic fiber also falls under the category of carbonized fiber, but it is preferable to blend other carbonized fiber (carbonized fiber C).
• the carbonized fiber C include cellulosic fibers typified by carbon fiber, rayon fiber, flame-retardant rayon fiber, cotton, and hemp. Among them, by mixing fibers such as rayon fiber and cellulose fiber such as flame-retardant rayon fiber, it is possible to improve hygroscopicity and touch when worn.
• the mixing ratio is 5% by mass to 40% by mass in the composite spun yarn, which improves hygroscopicity and touch when worn. It is preferable because it causes.
• the modacrylic short fiber used in the present invention is preferably 60% by mass or more, more preferably 70% by mass or more in the composite spun yarn from the viewpoint of sufficiently generating a self-extinguishing gas.
• the mass content of the carbonized fibers including the modacrylic short fibers B and the carbonized fibers C in the composite spun yarn is preferably 65% by mass or more, and there is no particular upper limit, and 100% is not a problem.
• other fibers D other than the above can be contained in the back surface layer of the present invention.
• the other fiber D include elastic fibers such as polyurethane elastic fibers and conductive fibers. These other fibers D can be contained in the composite spun yarn constituting the back surface layer.
• the content mass ratio is preferably 35% by mass or less, and more preferably 10% by mass or less in the back surface layer.
• the lower limit may be 0% by mass or an amount capable of imparting a desired function, but specifically, it is preferably 2% by mass or more.
• Elastic fibers such as polyurethane elastic fibers are preferably used for at least a part of the weft of the back surface layer.
• elastic fibers such as polyurethane elastic fibers
• long elastic fibers such as modacryl short fibers and long / short composite spun yarns such as core spandex yarn (CSY).
• the polyurethane elastic fiber refers to a fiber made of a long-chain synthetic polymer formed by urethane bonding, and the fineness of the polyurethane used may be arbitrarily selected according to the desired stretch force and stretch back property.
• “Lycra (registered trademark)” manufactured by Toray Operontex Co., Ltd. may be mentioned, and those having chlorine resistance and deodorant functions may be selected.
• the conductive fibers are preferably used for at least a part of the warp threads.
• the long-fiber conductive fiber As the usage form of the conductive fiber, it is preferable to use the long-fiber conductive fiber and use it as a long-short composite spun yarn such as a core-sheath composite spun yarn (CY).
• CY core-sheath composite spun yarn
• conductive fibers for the back layer, static electricity generated when wearing in winter can be suppressed, and discomfort when wearing can be avoided.
• the conductive fibers used in the present invention include metal fibers and carbon fibers, but it is preferable to use carbon-containing fibers from the viewpoint of comfort and handleability.
• “Bertron (registered trademark)” manufactured by KB Seiren Co., Ltd., “Cracabo (registered trademark)” manufactured by Kuraray Industries, Inc., and “Luana (registered trademark)” manufactured by Toray Industries, Inc. can be mentioned.
• the multilayer structure fiber structure of the present invention has at least a nodule layer in addition to the above-mentioned front surface layer and back surface layer. The details will be further described below.
• the nodule layer knots the front surface layer and the back surface layer by interlacing and knotting with the warp or weft of the front surface layer and interlacing and knotting with the warp or weft of the back surface layer. It is a layer to do.
• the knotting threads that make up this nodule layer knot the front and back layers through the nodule layer, and the surface layer becomes a layer that connects the flame-retardant material so as not to expose it, and convection of self-extinguishing gas, which will be described later. It is a layer that contributes to.
• the thread used for the nodule layer only the warp, only the weft, and both the warp and the weft can be used.
• the warp threads forming the front surface layer, the warp threads forming the nodule layer, and the warp threads forming the back surface layer are warped and set on a loom, and the weft threads of the surface layer are interlaced
• one A three-layer structure woven fabric can be woven by interlacing the portion with the warp of the nodule layer and knotting the portion, and when interlacing the weft of the back surface layer with the warp of the nodule layer and knotting a part of the portion.
• the fiber used for the nodule layer of the present invention is preferably a flame-retardant fiber, and specifically, it is preferably the same composition as the material of the composite spun yarn that can be used for the back surface layer. In particular, it is preferably a fiber composed of modaacrylic short fibers and rayon short fibers.
• the multilayer structure fiber structure of the present invention has at least the above-mentioned front surface layer, nodule layer, and back surface layer. The details will be further described below.
• the multi-layered fiber structure of the present invention has a breathability of 5 to 60 cm 3 / (cm 2 ⁇ sec).
• the air permeability By setting the air permeability to 5 cm 3 / (cm 2 ⁇ sec) or more, preferably 8 cm 3 / (cm 2 ⁇ sec) or more, it is possible to sufficiently convect the self-extinguishing gas emitted from the moda acrylic fiber at the time of combustion. it can.
• it is 60 cm 3 / (cm 2 ⁇ sec) or less, preferably 30 cm 3 / (cm 2 ⁇ sec) or less, it is possible to suppress the dispersion of the self-extinguishing gas emitted from the modal acrylic fiber at the time of combustion. Can be done.
• This air permeability can be controlled by the cover factor of the multilayer structure fiber structure described later.
• the air permeability of the multilayer structure fiber structure is as follows, in accordance with "8.26.1 A method (Frazier type method)" of JIS L1096: 2010 "Fabric test method for woven fabrics and knitted fabrics”. Refers to the value measured and calculated according to the procedure in. (1) Collect one test piece of about 200 mm ⁇ 200 mm from each of five different samples. (2) After attaching the test piece to one end of the cylinder of the Frazier type tester, adjust the suction fan and air hole so that the inclined barometer shows a pressure of 125 Pa with an adjustment resistor, and the vertical atmospheric pressure at that time. Measure the pressure indicated by the meter.
• the multilayer structure fiber structure of the present invention has a cover factor of 1800 to 2500.
• the air permeability can be set to 30 cm 3 / (cm 2 ⁇ sec) or less, which is sufficient for convection of the self-extinguishing gas.
• it when it is 2500 or less, preferably 2300 or less, it can be 8 cm 3 / (cm 2 ⁇ sec) capable of convection of the self-extinguishing gas.
• the cover factor (CF) of the multilayer structure fiber structure refers to a value calculated as follows. (1) The cover factor of each layer of the front surface layer, the nodule layer, and the back surface layer is calculated by the following formula. If there are layers other than the front surface layer, nodule layer, and back surface layer, the calculation is performed in the same manner.
• ⁇ CF ⁇ (a ⁇ ⁇ D) + (b ⁇ ⁇ D') ⁇ ⁇ 0.5 here, a: Number of warp threads per inch (25.4 mm) of the woven fabric in the layer (threads / 25.4 mm) b: Number of weft threads per inch (25.4 mm) of the woven fabric in the layer (threads / 25.4 mm) D: Total fineness of warp threads in the layer (dtex) D': Total fineness (dtex) of the weft in the layer. (2) Calculate the total value of the calculated cover factors of each layer.
• the multilayer structure fiber structure of the present invention has an OI value (oxygen index) measured by "8.5 E method (oxygen index method test) E-2" of JIS L1091: 1999 "Combustibility test method for textile products”. ) Is preferably 26% or more. When the OI value (oxygen index) is 26% or more, even if the multilayer structure fiber structure is ignited, the residual flame time and the residual dust time can be shortened, and the combustion area can be reduced.
• the thickness of the multilayer structure fiber structure of the present invention is preferably 0.3 mm or more and 0.7 mm or less.
• the content mass ratio of the modal acrylic short fiber B in the multilayer structure fiber structure is preferably 30 to 70% by mass, and 35 to 60 is preferably mass%.
• the content mass ratio of the elastic fibers in the multilayer structure fiber structure is 1 to 10% by mass, which is an appropriate elongation recovery property. It is preferable from the point of view.
• the elongation rate of the multilayer structure fiber structure is 5% or more.
• the upper limit is preferably 15%. Within the above range, it is possible to impart appropriate stretchability.
• the multilayer structure fiber structure of the present invention since the multilayer structure fiber structure of the present invention has high flame retardancy, it is not always necessary to apply flame retardant treatment, but in order to further enhance the flame retardant effect.
• a halogen-based or phosphorus-based flame retardant may be applied to at least a part of the multilayer structure fiber structure, or a fiber in which a halogen-based or phosphorus-based flame retardant is kneaded may be used. Above all, it is preferable to carry out the treatment using a melamine resin which does not easily affect the high visibility.
• the clothing or work clothes of the present invention is composed of the above-mentioned multi-layered fiber structure.
• Examples of clothing in the present invention include outer clothing blouson and pants that can be worn casually in outdoor scenes such as bonfire, BBQ, camping, and fireworks.
• the work clothes of the present invention are excellent in comfort, have self-extinguishing property by constituent fibers even if sparks or flames ignite, and are also excellent in high visibility that facilitates worker recognition during night work. Therefore, it is particularly suitable for work clothes worn by night workers such as protective clothing for work near a fire source and welding work, railway security personnel, and road construction.
• the present invention will be specifically described based on Examples. However, the present invention is not limited to these examples. In addition, in the measurement of each physical property, if there is no particular description, the measurement is performed based on the above method.
• Measurement of light resistance (light fastness) of the multilayer structure fiber structure The light fastness is determined by performing a dye fastness test specified in JIS L0842: 2004 "Dyeing fastness test method for ultraviolet carbon arc lamp light”. Passed at 4th grade or higher.
• the texture is too soft: 1, soft: 2, moderate: 3, hard: 4, too hard: 5.
• Example 1 A long-short composite spun yarn (40s) which is a CSY in which a spun yarn (40s) made of a cationic dyeable polyester fiber (fineness: 1.45dtex, round cross section) is used as a warp and a polyurethane elastic fiber is covered with a cationic dyeable polyester fiber as a weft. ), Using a normal rapier loom, a surface layer having a weaving structure of 2/1 twill and a weaving density of 100 wefts / 25.4 mm ⁇ 80 wefts / 25.4 mm was formed.
• Multilayer fiber structure The obtained fiber structure was dyed using a liquid flow dyeing machine to obtain a multilayer structure fiber structure having a cover factor of 2204 and an air permeability of 18 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure.
• the residual flame time of this multilayer structure fiber structure was 0 seconds and the residual dust time was 4 seconds, which were particularly excellent in flame retardancy.
• Example 2 The weaving density of the front surface layer and the back surface layer is 100 warp / 25.4 mm ⁇ 65 wefts / 25.4 mm, and the weaving density of the knot layer is 20 warp / 25.4 mm ⁇ 0 weft / 25.4 mm.
• a multilayer structure fiber structure was obtained in the same manner as in Example 1 except that the cover factor of the fiber structure was 2041 and the air permeability was 30 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer structure fiber structure was 0 seconds and the residual dust time was 4 seconds, which were particularly excellent in flame retardancy.
• Example 3 The weaving density of the front surface layer and the back surface layer is 100 warp / 25.4 mm ⁇ 56 wefts / 25.4 mm, and the weaving density of the knot layer is 20 warp / 25.4 mm ⁇ 0 weft / 25.4 mm.
• a multilayer fiber structure was obtained in the same manner as in Example 1 except that the cover factor of the fiber structure was 1859 and the air permeability was 56 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer structure fiber structure was 0 seconds, and it was excellent in flame retardancy.
• Example 1 The weaving density of the front surface layer and the back surface layer is 99 warp / 25.4 mm ⁇ 59 wefts / 25.4 mm, and the weaving density of the knot layer is 15 warp / 25.4 mm ⁇ 0 weft threads / 25.4 mm.
• a multilayer structure fiber structure was obtained in the same manner as in Example 1 except that the cover factor of the fiber structure was 1870 and the air permeability was 65 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer structure fiber structure was 10.5 seconds, and the residual dust time was 6.3 seconds, which were below the standard, and the flame retardancy was not sufficient.
• Example 2 The weaving density of the front surface layer and the back surface layer is 116 warp / 25.4 mm ⁇ 95 weft / 25.4 mm, and the weaving density of the knot layer is 35 warp ⁇ 0 weft / 25.4 mm.
• a multilayer fiber structure was obtained in the same manner as in Example 1 except that the cover factor was 2582 and the air permeability was 7 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer fiber structure was 6.8 seconds, which was not sufficient for flame retardancy.
• Example 3 The weaving density of the front surface layer and the back surface layer is 80 warp / 25.4 mm ⁇ 50 weft / 25.4 mm, and the weaving density of the knot layer is 10 warp ⁇ 0 weft / 25.4 mm.
• a multilayer fiber structure was obtained in the same manner as in Example 1 except that the cover factor was 1526 and the air permeability was 52 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer structure fiber structure was 6 seconds, and the residual dust time was 8 seconds, and the flame retardancy was not good.
• Example 4 The weaving density of the front surface layer and the back surface layer is 120 warp / 25.4 mm ⁇ 95 weft / 25.4 mm, and the weaving density of the knot layer is 35 warp / 25.4 mm ⁇ 0 weft / 25.4 mm.
• a multilayer fiber structure was obtained in the same manner as in Example 1 except that the coverage factor of the fiber structure was 2628 and the air permeability was 4 cm 3 / (cm 2 ⁇ sec). Table 1 shows the results of each evaluation of the obtained multilayer fiber structure. The residual flame time of this multilayer structure fiber structure was 7.5 seconds, and the residual dust time was 5 seconds, and the flame retardancy was not good.

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• 2020
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