Flame-retardant knitted fabrics and clothing

Abstract

To provide a flame-retardant knitted fabric that provides clothing which can be worn without discomfort in various situations including daily life. [Solution] The present invention relates to a flame-retardant knitted fabric having a multilayer structure including a surface layer knitted with surface yarns and a back layer knitted with back yarns, containing flame-retardant fibers and non-flame-retardant fibers, wherein when the mass of the knitted fabric is 100% by mass, the flame-retardant fibers are contained in a proportion of 40% by mass or more and 80% by mass or less, wherein non-flame-retardant cellulosic fibers are contained as the non-flame-retardant fibers, the proportion of non-flame-retardant cellulosic fibers in the non-flame-retardant fibers contained in the back layer is 60% by mass or more, and the basis weight of the knitted fabric (g / m 2 ) is defined as A, the interknitting rate (%) of the back yarn is I B and the proportion (% by mass) of non-flame-retardant fibers in the back layer is C B and the proportion (%) of the thickness of the back layer in the thickness of the knitted fabric determined from an SEM image is T B then W calculated by the following formula 1 CB is more than 0 and 80.0 or less. W CB = A × (I B / 100) × (C B / 100) × (T B / 100) (Formula 1)

Description

[Technical Field]

[0001] This disclosure relates to a flame-retardant knitted fabric having a surface layer and a back layer, and clothing made using said flame-retardant knitted fabric. [Background technology]

[0002] Conventionally, various types of flame-retardant knitted fabrics have been proposed. For example, Patent Document 1 describes a flame-retardant knitted fabric containing 80% by mass or more of spun yarn containing flame-retardant synthetic fibers and cellulose fibers, wherein only the spun yarn arranged on the reverse side is water-repellent, and the entire reverse side is not water-repellent, the LOI value (Limited Oxygen Index) is 25 or higher, and the evaporable free moisture content measured according to JIS L 1096 is 3 g / 202.5 cm. 2 In summary, a flame-retardant knitted fabric has been proposed in which the water absorption on the reverse side of the knitted fabric, as measured according to the Bylek method, is smaller than that on the surface.

[0003] Patent Document 2 describes a material that uses spun yarn containing flame-retardant fibers, has two layers joined together by binding yarn, has a rutted surface, and has an air permeability of 140 cm². 3 / cm 2 A two-layer fabric with a thickness of 0.5 sec or more has been proposed. Patent Document 3 describes a fabric containing flame-retardant fibers and having an uneven structure on at least one surface, wherein the area of ​​at least one surface is 0.5 mm². 2 It has recesses of 0.3 mm or more in depth, and a basis weight of 150-300 g / m². 2 And the breathability is 150-300 cm 3 / cm 2 ·sec has been proposed, in which the fabric has a specific knitting structure, and the uneven structure is formed by the knitting structure. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 7438519 [Patent Document 2] Patent No. 7311314 [Patent Document 3] Japanese Patent No. 7051378 Publication [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] To provide a knitted fabric that exhibits excellent flame retardancy and provides clothing that can be worn without discomfort in various situations including daily life when used for clothing. [Means for Solving the Problem]

[0006] The flame-retardant knitted fabric of the present disclosure is a knitted fabric having a multilayer structure including two or more layers including a surface layer knitted with surface yarns and a back layer knitted with back yarns, comprises flame-retardant fibers and non-flame-retardant fibers, when the mass of the knitted fabric is 100% by mass, the flame-retardant fibers are contained in a proportion of 40% by mass or more and 80% by mass or less, the non-flame-retardant fibers include non-flame-retardant cellulose-based fibers, the back layer contains non-flame-retardant fibers, and the proportion of the non-flame-retardant cellulose-based fibers in the non-flame-retardant fibers contained in the back layer is 60% by mass or more, The basis weight of the knitted fabric (g / m 2 ) is defined as A, the percentage of interknitted back yarns (%) is defined as I B , the proportion of non-flame-retardant fibers in the back layer (% by mass) is defined as C B , the proportion of the thickness of the back layer in the total thickness of the knitted fabric determined from SEM images (%) is defined as T B , W determined by the following formula 1 CB is greater than 0 and 80.0 or less, and relates to the knitted fabric. W CB = A × (I B / 100) × (C B / 100) × (T B / 100) (Formula 1) [Effect of the Invention]

[0007] The flame-retardant knitted fabric of this disclosure contains flame-retardant fibers and non-flammable fibers, and the non-flammable fibers include non-flammable cellulose fibers. By adjusting the interweaving ratio of the backing yarn and the thickness of the backing layer, it is possible to increase the proportion of non-flammable cellulose fibers in the backing layer. Therefore, the knitted fabric exhibits flame retardancy and possesses properties derived from the non-flammable cellulose fibers (e.g., water absorption, excellent feel against the skin, appropriate firmness and resilience). Furthermore, if the garment is constructed using this knitted fabric so that the backing layer is positioned closer to the wearer, the excellent wearing comfort derived from the non-flammable cellulose fibers can be further enhanced. As a result, this knitted fabric provides garments that exhibit flame retardancy and cause less discomfort when worn in various situations, including daily life. [Brief explanation of the drawing]

[0008] [Figure 1] The electron microscope image showing the cross-section of the knitted fabric obtained in Example 5 shows a cross-sectional view corresponding to the overall thickness of the knitted fabric and the thickness of the surface layer. [Modes for carrying out the invention]

[0009] (Background leading to this embodiment) In places where fires may occur, such as manufacturing plants, construction sites, and welding workshops, the wearing of flame-retardant clothing has become commonplace from a safety standpoint. Various flame-retardant fabrics have been proposed to achieve both comfort as clothing and flame retardancy, and examples of these are shown in the above-mentioned Patent Documents 1 to 3.

[0010] On the other hand, burns and fires caused by open flames are not limited to the places mentioned above, but are also frequently seen in daily life. In particular, recently, due to the growing popularity of outdoor activities and camping, there are more opportunities for people to come close to flames, such as barbecues and bonfires, and accidents in which flames or sparks that come into contact with clothing ignite and spread rapidly, resulting in burns to the wearer, are increasing. For this reason, when enjoying these activities in which open flames may be generated, there is a growing trend to wear clothing made of flame-retardant fabric to reduce the risk of burns that may occur during these activities. However, the fabrics used for flame-retardant clothing worn in manufacturing plants and the like are often designed to withstand flames erupting from large furnaces such as blast furnaces, or large amounts of scattered sparks and embers, as the source of instantaneous contact with the clothing. These fabrics are not necessarily suitable for clothing worn during outdoor leisure activities enjoyed in a relaxed atmosphere, and there is still room for improvement in terms of comfort, feel against the skin, and ease of movement.

[0011] For example, in tops such as T-shirts, comfort is given greater importance, and knitted fabrics (e.g., jersey knit) that have moderate firmness and resilience without restricting body movement are frequently used. Fabrics containing cellulose fibers such as cotton fibers (also simply called cotton or cotton) and hemp fibers tend to be preferred. It is not easy to provide a knitted fabric that is flame-retardant while retaining the texture and feel of commonly used flame-retardant cellulose fibers. For example, the flame-retardant spun yarn disclosed in the example of Patent Document 1 is a spun yarn made by mixing 75% by mass of flame-retardant vinylon fiber and 25% by mass of cotton fiber. The proportion of cellulose fibers contained in this spun yarn, more specifically the proportion of cotton contained in the spun yarn, is small, and the texture and other properties of the cellulose fibers may not be fully exhibited.

[0012] Furthermore, the fabrics proposed in Patent Documents 2 and 3 require a specific uneven surface, and therefore, due to design constraints and other factors, their versatility as clothing applications is not necessarily high. In addition, all the fabrics disclosed in these documents are made from spun yarn composed of aramid fibers, and are not necessarily suitable for making everyday clothing.

[0013] The inventors conducted various studies to obtain a knitted fabric that allows for the inclusion of a certain amount of flame-retardant cellulose fibers, such as cotton fibers, and possesses an excellent texture derived from these flame-retardant cellulose fibers. As a result, when constructing a multilayer knitted fabric having a surface layer and a back layer using flame-retardant fibers and flame-retardant fibers that are partially or entirely flame-retardant cellulose fibers, the inventors have succeeded in obtaining a knitted fabric that is flame-retardant and possesses a good texture and feel by designing the fabric so that the proportion of flame-retardant fibers in the entire knitted fabric is 40% by mass or more and 80% by mass or less, and so that the parameters determined by the total weight of the knitted fabric, the proportion of flame-retardant fibers in the back layer, the interweaving ratio of the back layer, and the proportion of the back layer thickness to the total thickness of the knitted fabric are within a predetermined range, and so that the flame-retardant fibers in the back layer consist of a predetermined proportion or more of flame-retardant cellulose fibers. The following describes this embodiment.

[0014] The flame-retardant knitted fabric of this embodiment (hereinafter also simply referred to as "knitted fabric") includes flame-retardant fibers and non-flammable fibers. Therefore, these fibers will be described first.

[0015] <Flame-retardant fiber> Flame-retardant fibers are fibers that possess flame retardancy, and refer to fibers whose LOI (Limited Oxygen Index) value, measured according to JIS K7201 (Plastics - Test method for flammability by oxygen index):2021, is 25 or higher. Examples of flame-retardant fibers include flame-retardant synthetic fibers, flame-retardant cellulose fibers, natural fibers other than cellulose fibers to which flame retardancy has been imparted, and flame-retardant inorganic fibers. In this embodiment, flame-retardant synthetic fibers and / or flame-retardant cellulose fibers may be used in particular as flame-retardant fibers. These fibers will be described below. <Flame-retardant synthetic fiber> Examples of flame-retardant synthetic fibers include fibers obtained by melt-spinning a synthetic resin with a flame retardant added, fibers obtained by melt-spinning a synthetic resin and then adding a flame retardant as a post-processing step, and fibers obtained by melting a synthetic resin that is itself flame-retardant.

[0016] Examples of flame-retardant synthetic fibers include modacrylic fibers, flame-retardant acrylic fibers, flame-retardant polyester fibers, flame-retardant polyolefin fibers, flame-retardant polyamide fibers, flame-retardant polycarbonate fibers, flame-retardant vinylon fibers, meta-aramid fibers, polyimide fibers, para-aramid fibers, poly-para-phenylenebenzoxazole fibers, polybenzimidazole fibers, polyetherimide fibers, and polyamideimide fibers. Among the fibers listed here, those not explicitly labeled "flame-retardant" are those where the synthetic resin itself possesses flame-retardant properties.

[0017] In this embodiment, the flame-retardant synthetic fiber may be at least one selected from the group consisting of modacrylic fiber, flame-retardant polyester fiber, flame-retardant polyolefin fiber, flame-retardant polyamide fiber, and flame-retardant polycarbonate fiber. These synthetic fibers are commonly used in clothing and do not make the texture of knitted fabrics or other woven fabrics extremely stiff, providing a texture that is easily accepted by general consumers.

[0018] Examples of polyolefin fibers include polypropylene fibers and polyethylene fibers. Polypropylene fibers are fibers containing polypropylene, and polypropylene may be a homopolymer of propylene, or a copolymer containing propylene and copolymerizable components, with a propylene content exceeding 50 mol%. The copolymerizable components with propylene are not particularly limited, but examples include olefin monomers such as ethylene, butene, and methylpentene. Polypropylene is preferably a propylene homopolymer. The polypropylene may be used alone or in combination of two or more types.

[0019] Polyester fibers are fibers containing polyester resins. Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof. Furthermore, the polyester resin may be virgin polyester polymerized using petroleum-derived and / or plant-derived raw materials, recovered polyester, or so-called recycled polyester. In light of the current demand for CO2 emission reduction and environmentally friendly materials, biomass polyester polymerized using at least a portion of plant-derived raw materials, or recycled polyester, are used as appropriate. Recovered polyester is not particularly limited, but examples include containers (such as PET bottles for liquids like beverages) and clothing polyester collected for resource recycling purposes, industrial waste polyester, or defective or waste polyester generated in various processes for manufacturing fibers, films, and other molded products.

[0020] Examples of polyamide fibers include common nylon fibers, such as nylon 6,6 or nylon 6-obtained by melt spinning, and all-aromatic polyamide fibers known as aramid fibers.

[0021] Preferably, the polycarbonate fiber contains a polycarbonate resin having, for example, a number-average molecular weight of 19,000 or less and a degree of branching in the range of 0.1 mol% to 0.8 mol%. The number-average molecular weight and degree of branching mentioned herein are those after fiber formation, and a method for measuring these parameters after fiber formation is described in Japanese Patent No. 5591046. Alternatively, as the polycarbonate fiber, a polycarbonate fiber using a fiber treatment agent containing a specific component, as disclosed in Japanese Patent No. 7441484, is also preferably used, and more preferably, a polycarbonate fiber in which the number-average molecular weight of the polycarbonate resin contained in the polycarbonate fiber is 9,000 to 16,000 and the weight-average molecular weight is 22,000 to 32,000.

[0022] Specific examples of flame retardants used to impart flame retardancy to these synthetic resin fibers are as follows: Examples of phosphorus-containing compounds include red phosphorus, phosphate ester compounds, aromatic phosphate ester compounds, oligomeric condensates of aromatic phosphate ester compounds, (metal) phosphates, (metal) organic phosphates, ammonium polyphosphate, thermosetting resin surface coating ammonium polyphosphate, melamine-modified ammonium polyphosphate, and melamine polyphosphate. Examples of nitrogen-containing compounds include (iso)cyanurate derivatives, (iso)cyanuric acid derivatives, guanidine derivatives, and urea derivatives. Examples of inorganic compounds include metal oxides (antimony trioxide, antimony pentoxide, molybdenum oxide), metal hydroxides (aluminum hydroxide, magnesium hydroxide), metal composite oxides (zirconium-antimony composite oxide), and metal composite hydroxides (zinc hydroxystainate). Examples of brominated compounds that can be used as flame retardants include bistribromophenoxyethane, ethylenebistetrabromophthalimide, and ethylenebispentabromophthalimide. The above-mentioned flame retardant may be included in the synthetic resin fiber in a proportion of, for example, 0.5% by mass or more and 5.0% by mass or less, and particularly 0.8% by mass or more and 3.0% by mass or less.

[0023] In this embodiment, modacrylic fibers, and more particularly modacrylic fibers containing an antimony compound, are preferably used. When modacrylic fibers and modacrylic fibers containing an antimony compound are used together with non-flammable fibers, they can prevent the combustion of the non-flammable fibers.

[0024] Modacrylic fiber is a fiber containing an acrylonitrile copolymer obtained by copolymerizing 35% to 85% by mass of acrylonitrile with 15% to 65% by mass of other components. The other components are, for example, monomers of halogen-containing vinyl, especially vinyl chloride, and halogen-containing vinylidene, especially vinylidene chloride. The copolymerization of these components causes the resin itself to exhibit high flame retardancy. The proportion of acrylonitrile in modacrylic fiber may be particularly 35% to 65% by mass.

[0025] When modacryl fibers contain an antimony compound, the antimony compound may be, for example, antimony trioxide, antimony tetroxide, or antimony pentoxide. The antimony compound may be present in the modacryl fibers in a proportion of, for example, 1.6% to 33% by mass. Modacryl fibers containing an antimony compound are sold, for example, by Kaneka Corporation under the trade name "Protex" (registered trademark).

[0026] The fineness and fiber length of the flame-retardant synthetic fiber are selected considering spinnability and other factors. The fineness of the flame-retardant synthetic fiber may be, for example, 0.5 dtex or more and 5.0 dtex or less, particularly 1.0 dtex or more and 4.0 dtex or less, and more particularly 1.5 dtex or more and 3.5 dtex or less. The fiber length of the flame-retardant synthetic fiber may be, for example, 25 mm or more and 70 mm or less, particularly 30 mm or more and 60 mm or less, and more particularly 35 mm or more and 55 mm or less.

[0027] <Flame-retardant cellulose fiber> Flame-retardant cellulose fibers include, for example, regenerated fibers containing flame retardants, semi-synthetic fibers containing flame retardants, and flame-retardant regenerated fibers, semi-synthetic fibers, and natural cellulose fibers to which flame retardants have been added by post-processing.

[0028] Cellulosic fibers specifically include regenerated fibers, semi-synthetic fibers, and natural cellulosic fibers. Regenerated fibers include rayon and polynosic obtained by the viscose process, cupro obtained by the copper ammonia process, and lyocell (e.g., Tencel®), which is a solvent-spun cellulose fiber (also called refined cellulose fiber). Semi-synthetic fibers include, for example, acetate fibers. Natural cellulosic fibers are natural fibers derived from plants such as cotton, flax, linen, ramie, jute, banana, bamboo, kenaf, ginger lily, hemp, and kapok.

[0029] The flame-retardant cellulose fiber may be at least one selected from the group consisting of viscose rayon containing a flame retardant, refined cellulose fiber containing a flame retardant, and acetate fiber containing a flame retardant. The flame-retardant cellulose fibers listed herein are preferred because their flame retardancy is imparted by adding a flame retardant at the stage before spinning, and they easily maintain their flame retardancy even after washing. Viscose rayon, in particular, is widely used in clothing and is preferred because it imparts a soft feel to knitted fabrics and other woven materials. Examples of flame retardants include phosphorus-containing compounds, halogen-containing compounds, inorganic flame retardants, nitrogen compound-based flame retardants, and silicone compounds, as described in relation to flame-retardant synthetic fibers. Phosphorus-containing compounds and halogen-containing compounds may be particularly suitable for use with cellulose fibers. Phosphorus-containing compounds are preferred because they do not produce halogens when exerting their flame-retardant effect. Examples of phosphorus-containing compounds are as described in relation to flame-retardant synthetic fibers. The proportion of flame retardant contained in cellulose fibers may be, for example, 5% by mass or more and 50% by mass or less, and particularly 5% by mass or more and 30% by mass or less. Examples of viscose rayon containing flame retardants include the flame-retardant rayon fiber sold by Daiwabo Rayon Co., Ltd. under the trade name "DFG" (registered trademark), and the flame-retardant viscose fiber (flame-retardant modal fiber) "LENZING FR" (registered trademark) sold by Lenzing.

[0030] The fineness and fiber length of the flame-retardant cellulose fibers are selected considering spinnability and other factors. The fineness of the flame-retardant cellulose fibers may be, for example, 0.5 dtex or more and 7.0 dtex or less, particularly 0.8 dtex or more and 5.0 dtex or less, and more particularly 1.0 dtex or more and 4.5 dtex or less. The thickness of cotton fibers is expressed in micronears, taking into account variations in fiber diameter, deformation of cross-sectional shape, and twisting within a single fiber. When the flame-retardant cellulose fiber is a cotton fiber, its micronear is preferably between 2.8 and 5.5, and more preferably between 3.5 and 4.9. The fiber length of the flame-retardant cellulose fiber may be, for example, 25 mm or more and 70 mm or less, particularly 30 mm or more and 60 mm or less, and more particularly 35 mm or more and 55 mm or less.

[0031] <Non-flammable fiber> Non-flammable fibers refer to fibers whose Limiting Oxygen Index (LOI), measured according to JIS K7201 (Plastics - Test method for flammability by oxygen index):2021, is less than 25. Non-flammable fibers may include non-flammable synthetic fibers, non-flammable cellulose fibers, and non-flammable natural fibers other than cellulose fibers (silk, wool, and other animal hair fibers). Specific examples of resins that constitute non-flammable synthetic fibers are as previously explained in relation to flame-retardant synthetic fibers. The fineness and fiber length ranges of non-flammable synthetic fibers are also as previously explained in relation to flame-retardant synthetic fibers. In this embodiment, non-flammable cellulose fibers may be used as the non-flammable fibers. Non-flammable cellulose fibers will be described below.

[0032] <Non-flammable cellulose fiber> Non-flammable cellulose fibers are cellulose fibers that do not contain flame retardants or have not been post-processed with flame retardants, and whose LOI (Limited Oxygen Index) value, measured according to JIS K7201 (Plastics - Test method for flammability by oxygen index):2021, is less than 25. Cellulose fibers that have not been treated with flame retardants are usually non-flammable.

[0033] Specific examples of regenerated fibers, semi-synthetic fibers, and natural cellulose fibers, as well as their fineness and fiber length, are as previously explained in relation to flame-retardant cellulose fibers.

[0034] In this embodiment, the flame-retardant cellulose fiber may be at least one selected from the group consisting of cotton fiber, hemp fiber, viscose rayon fiber, refined cellulose fiber, and acetate fiber. These fibers are commonly used in clothing, and their properties in terms of fabric texture and feel are well known. Therefore, by appropriately selecting these fibers, the properties of the knitted fabric obtained by knitting the spun yarn can be appropriately adjusted according to the type of clothing, etc.

[0035] Non-flammable cellulose fibers may be cotton fibers in particular. Cotton fibers are used to give firmness and body to knitted fabrics. Furthermore, because cotton fibers themselves have excellent water absorption and moisture absorption properties, they not only improve the moisture absorption and water absorption of woven fabrics such as knitted fabrics, but also make it less likely for static electricity to be generated in knitted fabrics. In addition, because cotton fibers themselves have a pleasant feel against the skin, they easily improve the wearing comfort of clothing with a large contact area with the skin (for example, tops such as T-shirts). Cotton fibers are also easy to dye and have excellent color development, so they can be used for clothing in a variety of colors and patterns. Moreover, because cotton fibers have a proven track record of use as a natural fiber for clothing, including them in spun yarn (and consequently knitted fabrics and clothing) gives end consumers a sense of security.

[0036] <Spun yarn> The knitted fabric of this embodiment is composed of spun yarn made using one or more of the fibers described above, and the spun yarns constituting each layer of the knitted fabric are selected or designed so that the proportion of flame-retardant fibers in the entire knitted fabric falls within the range described below.

[0037] The spun yarns that make up the surface and middle layers may, for example, contain the following fibers in the following proportions. 1) Flame-retardant synthetic fibers: 35% by mass or more and 80% by mass or less, more preferably 40% by mass or more and 75% by mass or less, particularly 45% by mass or more and 70% by mass or less. Flame-retardant cellulose fibers: 5% by mass or more and 25% by mass or less, more preferably 5% by mass or more and 20% by mass or less, particularly 10% by mass or more and 20% by mass or less. Non-flammable cellulose fibers: 15% by mass or more and 60% by mass or less, more preferably 15% by mass or more and 50% by mass or less, and especially 20% by mass or more and 45% by mass or less.

[0038] 2) Flame-retardant synthetic fibers: 40% by mass or more and 80% by mass or less, more preferably 45% by mass or more and 75% by mass or less, Non-flammable cellulose fibers: 20% by mass or more and 60% by mass or less, more preferably 25% by mass or more and 55% by mass or less, and especially 25% by mass or more and 50% by mass or less. Other non-flammable fibers: 40% by mass or less, more preferably 30% by mass or less, especially 0% by mass.

[0039] As the spun yarn constituting the backing layer, in addition to 1) or 2) above, spun yarn containing non-flammable cellulose and other non-flammable fibers in the proportions shown in 3) below may be used. 3) Non-flammable cellulose fibers: 60% by mass or more, 72.5% by mass or more, especially 100% by mass Other non-flammable fibers: 40% by mass or less, 17.5% by mass or less, especially 0% by mass

[0040] In the above fiber composition, flame-retardant synthetic fibers impart flame retardancy to the spun yarn, and flame-retardant cellulose fibers impart flame retardancy to the spun yarn and also impart a texture derived from cellulose fibers to the fabric woven or knitted with the spun yarn. Non-flammable cellulose fibers do not have flame retardancy and can be selected relatively freely, playing a role in determining characteristics that affect the comfort of clothing made from the fabric, such as the feel and texture of knitted fabrics, moisture absorption, and water absorption. For example, when the non-flammable cellulose fibers are cotton fibers, they impart water absorption, body, and firmness to the knitted fabric. The spun yarn may contain two or more types each of flame-retardant synthetic fibers, flame-retardant cellulose fibers, and non-flammable cellulose fibers. Furthermore, by making the spun yarn constituting the backing layer have a high proportion of non-flammable cellulose fibers as described in 3) above, when the garment is constructed so that the backing layer is closer to the wearer's skin, it is possible to provide clothing with superior comfort.

[0041] The spun yarn having the fiber composition exemplified in 1) to 3) above may be spun by any method. For example, a spun yarn may be a vortex-pneumatic spun yarn having a group of untwisted fibers in an untwisted state located inside (in the center) of the yarn, and a group of wound fibers wrapped around the untwisted fiber group. Here, "untwisted state" means that in a spun yarn obtained by pneumatic spinning, such as Vortex® yarn, the fibers are parallel to the yarn axis. Wound fibers are those that, when observed on the side of the yarn, completely traverse the side of the yarn and are in complete contact with the side of the yarn. Fibers that do not have a portion in contact with the side of the yarn and cannot exert a winding force toward the center of the yarn cross-section are not considered wound fibers. Among fibers that do not fall into either the category of untwisted fibers or wound fibers, those with both ends in contact with the side of the yarn are considered floating fibers, and those with one end detached from the side of the yarn are considered fluffy fibers. All fibers that do not fall into any of the categories of wound fibers, floating fibers, or fluffy fibers are considered untwisted fibers. By giving the spun yarn this structure, the convergence of the fibers is increased, which enhances the firmness and resilience of the fabric made from the spun yarn, and also improves its water absorption and quick-drying properties. Spun yarn with this structure is obtained by spinning using a VORTEX® spinning machine (manufactured by Murata Machinery, Ltd.) and is sometimes called MVS (Murata Vortex Spinner) yarn. When MVS yarn is made into fabrics such as knitted fabrics, it is less likely to cause pilling and easily gives the fabric firmness and resilience.

[0042] Alternatively, the spun yarn may be a compact yarn obtained by a ring spinning machine equipped with a compact spinning system, where the fibers are concentrated by using air to draw air in the direction of the roving's movement, and then twisted. Alternatively, the spun yarn may be a ring-spun yarn or an open-end spun yarn.

[0043] In this embodiment, the surface yarn constituting the surface layer may be MVS yarn or compact yarn. Because these yarns have less fuzz on the surface, using them for the surface layer improves the appearance and anti-pilling properties of the fabric. In addition, in this embodiment, if the backing yarn constituting the back layer contains flame-retardant synthetic fibers, the backing yarn may be MVS yarn or compact yarn. This improves water absorption and quick drying on the surface that touches the wearer's skin, providing the wearer with a comfortable feel. In particular, the backing yarn constituting the back layer may be compact yarn. This provides a good feel against the skin, suppresses fuzzing even after repeated wear, and allows for long-term wear.

[0044] The yarn count of the spun yarns that make up each layer of the knitted fabric in this embodiment is not particularly limited, but the yarn count of the face yarn that makes up the surface layer using English cotton count (1 pound (approximately 454 g) / 840 yards (approximately 768 m) is 1 count; unless otherwise specified, the count refers to English cotton count) may be in the range of 5 count to 80 count, preferably 10 count to 60 count, and more preferably 12 count to 50 count. The spun yarn in this embodiment may be a single yarn, or a yarn made by twisting together multiple single yarns. Examples of yarns made by twisting together multiple single yarns include a double yarn (also called a twin yarn) made by twisting together two yarns, a triple yarn made by twisting together three single yarns, and a quadruple yarn made by twisting together four single yarns. Alternatively, the spun yarn in this embodiment may be a plied yarn (two or more spun yarns are plied together without twisting them together and used as a single yarn). By using yarn made by twisting or combining multiple spun yarns, the proportion of each fiber in each layer of the knitted fabric can be easily adjusted without increasing the number of types of spun yarns.

[0045] (Flame-retardant knitted fabric) The flame-retardant knitted fabric of this embodiment is a multilayer knitted fabric having a surface layer and a back layer, and contains flame-retardant fibers and non-flammable fibers, and may contain flame-retardant fibers in a proportion of 40% to 80% by mass when the total mass of the knitted fabric is 100% by mass.

[0046] Specific examples of multilayered knitted fabrics will be described later, but in multilayered knitted fabrics, the surface layer and back layer are determined according to the distinction between the back layer or back yarn and the surface layer or front yarn, as is usually clearly distinguishable in the field of knitted fabrics, such as terry cloth and brushed back knitted fabrics. In cases where both the surface layer and back layer have the same knitting structure and are indistinguishable in appearance, such as double-knitted fabrics, the layers on both sides of the knitted fabric will be determined according to the W described later. CB When calculated, 0 <W CB Layers that satisfy ≤80.0 are designated as the back layers.

[0047] As mentioned above, the proportion of flame-retardant fibers in the total mass (100% by mass) of the knitted fabric should be between 40% and 80% by mass, more particularly between 42% and 75% by mass, and more particularly between 44% and 72.5% by mass. If the proportion of flame-retardant fibers is too low, the knitted fabric may not be able to be given flame retardancy, and if the proportion of flame-retardant fibers is too high, the proportion of flame-retardant fibers will decrease, which may reduce the feel and texture of the knitted fabric.

[0048] In the entire knitted fabric, the proportion of non-flammable cellulose fibers included as non-flammable fibers may be 20% to 60% by mass of the total mass of the knitted fabric (100% by mass), more particularly 25% to 55% by mass, and more particularly 40% to 54% by mass. Non-flammable cellulose fibers such as cotton fibers and viscose rayon fibers that do not have flame retardancy will give the knitted fabric a good feel and texture. By making a certain amount of non-flammable fibers included in the entire knitted fabric non-flammable cellulose fibers, the entire knitted fabric can have excellent moisture absorption and water absorption, a good feel against the skin, and appropriate firmness and resilience.

[0049] The lining may contain, for example, 20% or more, particularly 40% or more, more particularly 55% or more, and even 100% by mass of non-flammable fibers relative to the total mass of the lining (100% by mass). The lining is generally the part of the garment that is closest to the wearer's skin and affects comfort; therefore, increasing the proportion of non-flammable fibers in the lining tends to improve comfort. By appropriately selecting the type and proportion of non-flammable fibers, it is possible to improve, for example, the moisture absorption and water absorption of the lining surface, and to obtain a garment with excellent wearability as well as appropriate firmness and body.

[0050] In the backing layer, non-flammable cellulose fibers may account for 60% or more by mass of the non-flammable fibers contained in the backing layer, more particularly 70% or more by mass, and even more particularly 80% or more by mass, and all non-flammable fibers may be non-flammable cellulose fibers. Non-flammable cellulose fibers such as cotton fibers and viscose rayon fibers that do not have flame retardancy will give the knitted fabric a good feel and texture. In addition, since the backing layer of the knitted fabric is often located on the side closer to the wearer's skin when it is made into a garment, by making a certain amount or more of the non-flammable fibers contained in the backing layer non-flammable cellulose fibers, the wearer will be able to feel the properties of non-flammable cellulose more easily. By making a certain amount or more of non-flammable cellulose fibers, for example, the moisture absorption and water absorption of the backing layer surface will be further improved, and it will also have a good feel against the skin, as well as appropriate firmness and resilience.

[0051] Furthermore, the backing layer may contain, for example, 25% or more, particularly 40% or more, and more particularly 60% or more of non-flammable cellulose fibers relative to the total mass of the backing layer (100% by mass), and the entire backing layer may be composed of non-flammable cellulose fibers (100% by mass). As mentioned above, non-flammable cellulose fibers such as cotton fibers and viscose rayon fibers that do not have flame retardancy provide a good feel and texture to the knitted fabric. Also, as mentioned above, the backing layer of the knitted fabric is often located on the side closest to the wearer's skin when it is made into clothing, so by making the proportion of non-flammable cellulose fibers in the entire backing layer above a predetermined amount, the hygroscopicity and water absorption of the backing layer surface in particular can be further improved, resulting in a superior feel against the skin, as well as appropriate firmness and resilience.

[0052] In the knitted fabric of this embodiment, the proportion (by mass) of non-flammable fibers in the surface layer may be smaller than the proportion (by mass) of non-flammable fibers in the back layer. The surface layer is often exposed to the outside when forming clothing and is in close proximity to flames and sparks, so by making the proportion of non-flammable fibers in the surface layer smaller and the proportion of flame-retardant fibers larger, the flame-retardant effect is more efficiently achieved. The difference between the proportion of non-flammable fibers in the surface layer and the proportion of non-flammable fibers in the back layer may be, for example, greater than 0% by mass and 80% by mass or less, particularly 20% by mass or more and 75% by mass or less, and more particularly 27.5% by mass or more and 60% by mass or less.

[0053] In the knitted fabric of this embodiment, the surface layer may contain flame-retardant fibers in proportion to the total mass of the knitted fabric, such as 40% to 80% by mass, particularly 45% to 75% by mass, and more particularly 55% to 70% by mass, relative to the total mass of the surface layer (100% by mass). The surface layer is generally exposed to the outside when forming clothing and is in close proximity to flames and sparks, so by configuring it to contain a large proportion of flame-retardant fibers, the flame retardancy of the knitted fabric is more effectively exhibited.

[0054] Furthermore, as long as the proportion of flame-retardant fibers to the total mass of the knitted fabric satisfies the above range, the knitted fabric of this embodiment may contain flame-retardant fibers at a rate of 50% or more by mass of the surface layer when the mass of the surface layer is 100% by mass, and the back layer may contain non-flammable cellulose fibers at a rate of 20% or more by mass of the back layer when the mass of the back layer is 100% by mass. By having flame-retardant fibers occupy more than half of the surface layer and including a certain proportion or more of non-flammable fibers in the back layer, the flame-retardant effect and the effect of improving wearability, etc., by the non-flammable cellulose fibers can be more reliably exhibited. The non-flammable cellulose fibers included in the back layer can, for example, improve the moisture absorption, water absorption, and feel of the back surface, and can also impart appropriate firmness and resilience to the knitted fabric. The proportion of flame-retardant fibers in the surface layer may be 55% by mass or more and 100% by mass or less, more preferably 60% by mass or more and 75% by mass or less, and the proportion of non-flammable cellulose fibers in the back layer may be 25% by mass or more and 100% by mass or less, more preferably 40% by mass or more and 72.5% by mass or less.

[0055] Alternatively, both the surface and back layers may contain, with respect to the total mass of each layer, flame-retardant fibers in amounts of, for example, 35% to 80% by mass, particularly 40% to 75% by mass, more particularly 45% to 70% by mass, flame-retardant cellulose fibers in amounts of 0% to 25% by mass, particularly 0% to 20% by mass, more particularly 0% to 20% by mass, and non-flammable cellulose fibers in amounts of 20% to 60% by mass, particularly 20% to 50% by mass, more particularly 20% to 45% by mass. As long as the proportion of each fiber satisfies these ranges, the proportions of flame-retardant fibers and non-flammable fibers in the surface and back layers may be the same or different. When both the outer and inner layers contain flame-retardant synthetic fibers, non-flame-retardant cellulose fibers, and optionally included flame-retardant cellulose fibers within the above range, garments with superior tactile feel and comfort can be provided regardless of whether the outer or inner layer is positioned closer to the wearer's skin.

[0056] The proportion of each fiber in the entire knitted fabric or in each layer, as described above, can be achieved by adjusting the fiber proportion in the spun yarns that make up each layer, and / or by appropriately combining multiple spun yarns to form double yarns or plied yarns. For example, each layer in which the proportion of each fiber is within the above range may be formed by knitting a double yarn or plied yarn (using two or more spun yarns as a single yarn by plied them together without twisting them) of a spun yarn containing or composed solely of flame-retardant fibers, particularly flame-retardant synthetic fibers, and a spun yarn composed solely of flame-retardant fibers. If the surface layer and / or back layer contains flame-retardant cellulose fibers, double yarns or plied yarns may be further constructed using spun yarns containing or composed solely of flame-retardant cellulose fibers.

[0057] The knitted fabric of this embodiment has a weight (g / m²) of the knitted fabric. 2 Let A be the value of the back yarn, and let I be the value of the back yarn cross-weave ratio (%). B The proportion (by mass) of non-flammable fibers in the backing layer is C B The ratio (%) of the thickness of the backing layer to the thickness of the knitted fabric, as determined by the SEM image, is T B In this case, W can be calculated using the following equation 1. CB ga 0 <W CB It is configured to satisfy ≤80.0. W CB =A × (I B / 100)×(C B / 100)×(T B / 100) (Formula 1)

[0058] I is the cross-weave ratio of the back yarn. B This is the ratio of the mass of the backing yarn to the total mass of the knitted fabric, and can be adjusted by the thickness of the face yarn, the thickness of the backing yarn, the length of the face yarn (length of yarn per 100 needles (100 wales)), the length of the backing yarn (length of yarn per 100 needles (100 wales)), and the knitted fabric structure (for example, the number of backing yarn skips in a loopback knit fabric). C is the ratio of non-flammable fibers to the backing layer. B This is the proportion of non-flammable fibers in the total mass of the backing layer, and non-flammable fibers include non-flammable cellulose fibers. BThis corresponds to the percentage (by mass) of non-flammable fibers contained in the spun yarn that will be used as the backing thread.

[0059] The ratio of the backing layer thickness to the total thickness of the knitted fabric can be determined from a 20x magnification SEM image of the cross-section of the knitted fabric. Specifically, a cardboard backing (12.5mm x 20mm) is attached to one side of a 10mm x 20mm x 10mm spacer using double-sided tape. The knitted fabric sample to be measured is attached to the opposite side of the cardboard backing, with its surface layer in contact with the backing. A cross-section of the sample is then photographed, and the thickness of the entire knitted fabric and the backing layer is measured from the captured image. The sample to be attached to the cardboard should be cut to 12.5mm (wale direction) x 20mm (coarse direction), and double-sided tape should be used to attach the sample to the cardboard. The attachment should be done so that the surface layer of the sample is in contact with the cardboard.

[0060] Before imaging, place a slide glass on the back side of the sample attached to the mounting board, and then place a 10g weight on top of that. Apply the load for 10 seconds, and then take the image within 5 minutes after removing this load. The image should be taken at 20x magnification.

[0061] In the captured SEM image, the thickness of the knitted fabric and the thickness of the surface layer are determined, and the difference between them is taken as the thickness of the back layer. Thickness measurements are taken at three locations in a single SEM image, and the average is calculated. This measurement is performed on three samples cut from different parts of the knitted fabric to be measured, and the average of the thickness of the knitted fabric and the back layer of the three samples is taken as the thickness of the knitted fabric and the back layer of the sample. Measurements are taken at a total of three locations in the course direction of the knitted fabric: 1) the center of the knitted fabric, and 2) the center of the line segment connecting the center of the knitted fabric to each of the two side edges of the knitted fabric (one point each). Therefore, samples are taken at each of the four division points when the knitted fabric is divided into four equal parts in the course direction of the knitted fabric to be measured. If the width of the knitted fabric to be measured (dimension in the course direction) is large and exceeds 3 meters, samples are taken at each of the four division points when the course direction of the knitted fabric is divided into five equal parts, and the thickness of each of the four samples is measured, and the average value is taken as the thickness of the knitted fabric.

[0062] Figure 1 shows an SEM image of the cross-section of the knitted fabric obtained in Example 5, described later, and the portion corresponding to the thickness of the knitted fabric and the thickness of the surface layer measured in the SEM image. In Figure 1, the yarns located in the foreground and photographed to have almost the same brightness correspond to the surface yarns that make up the surface layer and the middle yarns that connect the surface layer and the back layer. When measuring the thickness of the surface layer, if the knitted fabric includes middle yarns, the thickness of the layer including the middle yarns is taken as the thickness of the surface layer (corresponding to the double arrows shown as solid lines in Figure 1). The thickness of the surface layer corresponds to the shortest distance between the point where the loops of the surface yarn and middle yarn located in the foreground hang down the most (the lowest point in Figure 1) and the boundary between the knitted fabric and the backing paper.

[0063] The thickness of the knitted fabric corresponds to the distance between the boundary between the knitted fabric and the backing paper and the point where the loops of the backing yarn hang down the most (corresponding to the double-headed arrows shown by the dashed lines in the figure). In the SEM image, the backing yarn is located further back and appears as a darker image than the front and middle yarns.

[0064] When measuring thickness, fibers protruding from the yarn are ignored, and the portion where the fibers are twisted integrally in the spun yarn is designated as the face yarn, middle yarn, or back yarn, and the position where the loop hangs the most is determined. In addition, the three measurement locations for the thickness of the knitted fabric in a single SEM image are: 1) where the back yarn hangs the most, 2) where the back yarn hangs the least (where the point where the back yarn loop hangs the most is higher than that of the other back yarn loops), and 3) where the face yarn or middle yarn hangs the most (where the point where the face yarn or middle yarn loop hangs the most is higher than that of the other face yarn or middle yarn loops). The thickness of the knitted fabric and the thickness of the surface layer are measured at these locations. If the point where the face yarn hangs the most and the point where the back yarn hangs the most are not on a straight line parallel to the thickness direction at these locations, the distance between the knitted fabric and the backing paper is determined from the reference loop hanging point to the nearest loop hanging point in the direction of the knitted fabric surface.

[0065] For example, in Figure 1, the area labeled "a" corresponds to the point where the backing thread hangs the least, but the point where the front thread loop hangs the most does not lie on a straight line parallel to the thickness direction passing through that point. In this case, the thickness of the surface layer is measured at a', which is the point where the front thread or middle thread loop hangs the closest in the surface direction (left-right direction in the figure) from the point where the backing thread hangs the least, and this is used as the thickness of the surface layer in 2) above. Furthermore, when selecting measurement points, areas where the twist or loop of the yarn is unclear will be excluded.

[0066] By subtracting the thickness of the surface layer from the thickness of the knitted fabric obtained in this way, the thickness of the back layer can be determined, and the ratio of the thickness of the back layer to the thickness of the knitted fabric is T B It is possible to find this.

[0067] W CB This indicates that the degree of non-flammability of the underside layer can have an effect on the overall flame retardancy of the knitted fabric. CB The larger the value, the greater the influence of the non-flammability of the backing layer on the overall flame retardancy of the knitted fabric, and the lower the overall flame retardancy of the knitted fabric. In this embodiment, W CB As stated above, it may be 80.0 or less, in particular 70.0 or less, and more particularly 65.0 or less. Also, W CB This may be, for example, 2.0 or more, particularly 4.0 or more, and more particularly 6.0 or more. The knitted fabric of this embodiment is W CB The fact that the above range is maintained, combined with the proportion of flame-retardant fibers in the entire knitted fabric being between 40% and 80% by mass, results in a flame retardancy of LOI value of 25 or higher overall, even when the proportion of flame-retardant fibers in the backing layer is increased. CB As long as the ratio is 80.0 or less, the backing layer can be composed solely of flame-retardant fibers, such as flame-retardant cellulose fibers like cotton.

[0068] The knitted fabric of this embodiment also has a ratio (mass %) of flame-retardant fibers in the surface layer. S The cross-weave ratio (%) of the backing layer is BSubtracting 1 from 100 gives 100-I B to I S The ratio (%) of the thickness of the surface layer to the total thickness of the knitted fabric, as determined by the SEM image, is T S In this case, W can be calculated using the following equation 2. MS The aforementioned W CB R, which is the ratio to the given value, can be calculated using the following formula 3. SB R SB It is acceptable if the value is ≥0.71. W MS =A × (I S / 100)×(M S / 100)×(T S / 100) (Formula 2) R SB =W MS / W CB (Formula 3)

[0069] I S This corresponds to the ratio of the mass of the face yarn to the total mass of the knitted fabric, or, if the knitted fabric includes a middle yarn, the ratio of the mass of the face yarn and the middle yarn to the total mass of the knitted fabric, and can be adjusted by the thickness of the face yarn, the thickness of the back yarn, the length of the face yarn (length of yarn per 100 needles (100 wales)), the length of the back yarn (length of yarn per 100 needles (100 wales)), and the knitted fabric structure (for example, the number of skips of back yarn in a loopback knitted fabric). S This can also be adjusted by the thickness and length of the mid-layer yarn (length of yarn per 100 needles (100 wales)) if the knitted fabric includes mid-layer yarn. M is the percentage of flame-retardant fibers in the surface layer. S This is the proportion of flame-retardant fibers to the total mass of the surface layer. S This corresponds to the proportion (by mass) of flame-retardant fibers contained in the outer yarn and the middle yarn when the spun yarn or knitted fabric that forms the outer yarn also contains a middle yarn. The measurement methods for the thickness of the knitted fabric and the thickness of the outer layer are as previously explained in relation to the thickness of the inner layer, and from the measurement results T S We seek.

[0070] W MS This can show how the flame retardancy of the surface layer affects the flame retardancy of the entire knitted fabric, W MS The larger the value, the better the overall flame retardancy of the knitted fabric. CBW MS The ratio R SB This can indicate the balance between the flame retardancy of the surface layer and the flame-retardantness of the underside layer. The knitted fabric of this embodiment is R SB If it is 0.71 or higher, the proportion of flame-retardant fibers in the entire knitted fabric shall be 40% by mass or more and 80% by mass or less, and W CB Combined with the fact that the ratio is 80.0 or less, even if the proportion of non-flammable cellulose fibers in the backing layer is increased, the overall flame retardancy will be good. SB It may be 0.80 or higher, and more particularly 1.0 or higher, and R SB For example, it may be 60 or less, particularly 40 or less, and more particularly 20 or less.

[0071] The knitted fabric of this embodiment is a multilayered knitted fabric having a surface layer and a back layer, and specifically, it may be, for example, a terry cloth knit, a brushed back knit, a double-knit fabric, a rib knit fabric, a smooth knit fabric, or a double-knit jersey fabric. In terry cloth knit and brushed back knit fabrics, the surface yarns that make up the surface layer and the back yarns that make up the back layer are usually separate, and therefore, the surface and the back generally have different appearances. However, in rib knit fabric and smooth knit fabric, for example, the surface yarn and the back yarn are knitted using the same yarn, so the surface and the back have the same appearance and the same structure. Therefore, in rib knit fabric and smooth knit fabric, the fiber composition is the same in the surface layer and the back layer.

[0072] In the knitted fabric of this embodiment, the knitting structures of the surface and back layers are not particularly limited, and the surface and back layers may each independently have a weft knitting structure or a warp knitting structure. In the case of weft knitting, the knitted fabric can be provided as, for example, a corrugated knit fabric, a double-faced knit fabric, or a honeycomb knit fabric, having at least one knitting structure selected from the group consisting of plain knit, pique knit, jacquard knit, and mesh knit. In particular, plain knit is also called jersey knit and is used in various garments. The knitted fabric of this embodiment can also be provided with one or both of the surface and back layers being jersey knit.

[0073] French terry knit fabric is a knitted fabric in which loop pile is woven with backing yarn, and brushed back knit fabric is a knitted fabric in which loop pile woven with backing yarn is brushed, resulting in different appearances on the front and back. French terry knit fabric and brushed back knit fabric are widely used in sweatshirts and sweatpants, etc. The knit fabrics used in sweatshirts, etc., are often made with jersey knit using face yarn, and have a slightly larger weight, exhibiting relatively high heat retention, while the loop pile or brushed parts exhibit good water absorption.

[0074] French terry knit fabric and brushed terry knit fabric may each be a knit fabric having face yarn, middle yarn and back yarn, or they may be inlay knit fabric and brushed terry knit fabric without middle yarn. The knit structure formed by the face yarn may be plain knit (single stitch) or other structures. The number of back yarn skips in French terry knit fabric and brushed terry knit fabric is not particularly limited and may be, for example, 1 or more and 5 or less. Also, the yarn feeding ratio may be, for example, 1 or more and 2 or less for the face yarn and 0.3 or more and 0.8 or less for the back yarn, when the middle yarn is set to 1.00. In the case of inlay knit fabric or brushed terry knit fabric, the yarn feeding ratio may be, for example, 0.3 or more and 0.8 or less for the back yarn, when the face yarn is set to 1.00.

[0075] The weight of the knitted fabric in this embodiment is, for example, 120 g / m². 2 More than 700g / m 2 The following is acceptable. Multilayered knitted fabrics tend to exhibit their properties (e.g., heat retention) more readily and have higher flame retardancy when the weight is relatively high. The weight of the knitted fabric is particularly 180g / m². 2 More than 520g / m 2 The following may be true, and more particularly 200 g / m² 2 More than 500g / m 2 The following are acceptable. If the knitted fabric is a loopback knit, keeping the weight within these ranges can make it particularly practical.

[0076] The thickness of the knitted fabric in this embodiment (thickness measured from the above SEM image) may be 0.5 mm or more and 5.0 mm or less, particularly 0.8 mm or more and 4.0 mm or less, and more particularly 1.1 mm or more and 3.0 mm or less.

[0077] Furthermore, in the knitted fabric of this embodiment, the thickness of the surface layer measured from the above SEM image may account for 20% to 80% of the total thickness of the knitted fabric, particularly 30% to 75%, and more particularly 40% to 70%. The knitted fabric of this embodiment exhibits flame retardancy because the flame-retardant fibers contained in the surface layer located closer to the fire char, and this generates non-combustible gas, which then spreads throughout the entire knitted fabric through the voids in the fabric, thus ensuring the flame retardancy of the entire knitted fabric. It is also believed that the entire knitted fabric exhibits high flame retardancy even if the proportion of flame-retardant fibers in the backing layer is large, as long as the flame-retardant fibers contained in the surface layer generate a sufficient amount of non-combustible gas and the backing layer is located within a distance that allows the non-combustible gas to spread. The range over which the non-combustible gas spreads is thought to be affected by the proportion of the surface layer thickness to the total thickness of the knitted fabric; therefore, in order to achieve a better flame retardant effect, it is preferable to set the proportion of the surface layer thickness within the above range. Furthermore, whether the non-flammable gas spreads throughout the entire knitted fabric is also influenced by the type and proportion of fibers contained in each layer, and the above W takes these factors into consideration. CB and R SB That is the case.

[0078] Furthermore, in the knitted fabric of this embodiment, the coarse gauge and wale gauge are selected as appropriate according to the intended use of the fabric and are not particularly limited. In this embodiment, if the knitted fabric is a fleece knit or a brushed knit, the coarse gauge (stitches / 0.5 inch) of the knit structure formed by the face yarn (or face yarn and middle yarn if there is a middle yarn) may be 10.0 to 25.0, 13.0 to 22.0, or 14.0 to 20.0. The wale gauge (stitches / 0.5 inch) may be 6 to 20.0, 8.0 to 18.0, or 9.0 to 16.0. If the double-sided knitted fabric is a double-knit fabric, where the face yarn and back yarn each form a knit structure independently, each knit structure may have a coarse gauge and wale gauge within the above ranges.

[0079] In the knitted fabric of this embodiment, if the coarse and wale counts are within these ranges, by appropriately selecting the yarn count, and / or twisting multiple strands of yarn together, and / or using multiple strands of yarn held together, 10 cc / cm 2 ·Seconds or more 200cc / cm 2 It is possible to obtain a knitted fabric with an air permeability of less than 15 cc / cm², making it easy to obtain a knitted fabric with breathability suitable for the intended use of clothing. The air permeability is measured according to JIS L1096 8.26 Method A (Fragile method):2010. The air permeability of the knitted fabric in this embodiment is not particularly limited and is 15 cc / cm². 2 ·Seconds or more 150cc / cm 2 • It may be less than a second. 2 ·Seconds or more 120cc / cm 2 It may be less than a second.

[0080] If the knitted fabric of this embodiment is a loopback knit fabric, the length of the stitches knitted by the face yarn and, if any, the middle yarn is not particularly limited, and may be, for example, 25 cm or more and 60 cm or less per 100 needles (100 wales (w)). The length of the stitches knitted by the back yarn may be 10 cm or more and 30 cm or less.

[0081] (Clothing) The knitted fabric of this embodiment described above may be used to make clothing such as outerwear (sweatshirts, hoodies, etc.), bottoms (trousers, skirts, etc.), tops (shirts, blouses, T-shirts, tunics, cut-and-sew tops), socks, underwear (camisoles, boxer shorts, undershirts), gloves, and scarves. These garments may be everyday wear or uniforms.

[0082] The knitted fabric of this embodiment contains flame-retardant fibers and non-flammable fibers, and since it includes non-flammable cellulose fibers as non-flammable fibers, it is flame-retardant while also possessing the properties of non-flammable cellulose fibers. Furthermore, even if the backing layer of the knitted fabric of this embodiment is composed solely of non-flammable cellulose fibers, it can exhibit flame-retardant effects, making the feel and flexibility of the side closest to the wearer's skin closer to that of a normal knitted fabric made solely of non-flammable cellulose fibers. For example, a knitted fabric with a backing layer composed solely of non-flammable cellulose fibers is particularly suitable for making T-shirts, polo shirts, sweatshirts, sweatpants, cut-and-sew garments, etc.

[0083] The knitted fabric of this embodiment may contain flame-retardant cellulose fibers. In this case, by appropriately adjusting the types and proportions of non-flammable cellulose fibers and flame-retardant cellulose fibers, a variety of knitted fabrics can be provided with altered textures and flexibility in the surface and back layers. Such knitted fabrics allow for the provision of clothing that can be worn safely during activities such as barbecues and bonfires, without restricting the design of the garment, while maintaining a high level of design comparable to that of fabrics made with conventional knitted fabrics. [Examples]

[0084] This embodiment will be described in more detail below with reference to examples.

[0085] (Manufacturing of spun yarn) (Spun yarn 1) Modacrylic fibers containing an antimony compound (manufactured by Kaneka Corporation, trade name "Protex® Type C", fineness 1.7 dtex, fiber length 38 mm), flame-retardant viscose rayon (manufactured by Daiwabo Rayon Co., Ltd., fineness 1.7 dtex, fiber length 38 mm), and cotton fibers (cotton fibers from the United States, micronea 3.5-4.9, average fiber length 27 mm) were used. After weighing them in the proportions shown in Table 1, they were sequentially fed into the blending and beating process, carding process, combing process, and drawing process to obtain sliver. The obtained sliver was fed into the draft zone using a VORTEX spinning machine (Murata Machinery, Ltd., model number "VORTEX861"), drafted, and then spun and wound at a spinning speed of 300 m / min, a spindle diameter of 1.1 mm, and a nozzle pressure of 0.5 MPa to obtain a single yarn with an English cotton count of 20, containing 65% by mass of modacrylic fibers, 10% by mass of flame-retardant cellulose fibers, and 25% by mass of cotton fibers as non-flammable cellulose fibers.

[0086] (Spun yarn 2) Using the sliver produced when manufacturing spun yarn 1, MVS yarn was manufactured using the same spinning machine used to manufacture spun yarn 1. At this time, the total draft of the spinning machine was adjusted to produce a finer yarn, resulting in a single yarn with an English cotton count of 30, containing 65% by mass of modacrylic fiber, 10% by mass of flame-retardant cellulose fiber, and 25% by mass of cotton fiber as non-flammable cellulose fiber.

[0087] (Spun yarn 3) A sliver finer than the one produced when manufacturing spun yarn 1 was created. Using this sliver, MVS yarn was manufactured using the same spinning machine as that used to manufacture spun yarn 1. At this time, the total draft of the spinning machine was also adjusted to produce a finer yarn, resulting in a single yarn with an English cotton count of 40, containing 65% by mass of modacrylic fiber, 10% by mass of flame-retardant cellulose fiber, and 25% by mass of cotton fiber as non-flammable cellulose fiber.

[0088] (Spun yarn 4) Using the same modacrylic and cotton fibers as used in the production of spun yarn 1, and weighing them so that modacrylic fibers accounted for 55% by mass and cotton fibers for 45% by mass, a spun yarn was produced in the same manner as spun yarn 1. The result was a single yarn with an English cotton count of 20, containing 55% by mass of modacrylic fibers and 45% by mass of cotton fibers as non-flammable cellulose fibers.

[0089] (Spun yarn 5) Using the same modacrylic fibers, flame-retardant viscose rayon, and cotton fibers used in the production of spun yarn 1, the materials were weighed to achieve a composition of 45% by mass of modacrylic fibers, 15% by mass of flame-retardant viscose rayon, and 40% by mass of cotton fibers. MVS yarn was then produced using the same spinning machine as that used to produce spun yarn 1. At this time, the total draft of the spinning machine was adjusted to produce a finer yarn, resulting in a single yarn with an English cotton count of 20, containing 45% by mass of modacrylic fibers, 15% by mass of flame-retardant cellulose fibers, and 40% by mass of cotton fibers as non-flammable cellulose fibers.

[0090] (Spun yarn 6) Using the sliver produced when manufacturing spun yarn 5, MVS yarn was manufactured using the same spinning machine as when manufacturing spun yarn 1. At this time, the total draft of the spinning machine was adjusted to produce a finer yarn, resulting in a single yarn with an English cotton count of 30, containing 45% by mass of modacrylic fibers, 15% by mass of flame-retardant cellulose fibers, and 40% by mass of cotton fibers as non-flammable cellulose fibers.

[0091] (Spun yarn 7) Using the sliver produced when manufacturing spun yarn 4, and in a ring spinning machine equipped with a compact spinning system, the fibers were concentrated by using air to draw them in the direction of the roving's movement, and then twisted to obtain a spun yarn (compact yarn) with an English cotton count of 20, containing 55% by mass of modacrylic fibers and 45% by mass of cotton fibers as non-flammable cellulose fibers. (Spun yarn 8) Using only the same cotton fibers as those used in the production of spun yarn 1, a carded sliver was obtained. The roving was then fed into a ring spinning machine, drafted, and twisted to obtain a spun yarn (ring carded yarn) consisting of cotton fibers and having an English cotton count of 20. (Spun yarn 9) Using only the same cotton fibers as those used in the production of spun yarn 1, a carded sliver was obtained. The roving was then supplied to a ring spinning machine, drafted, and twisted to obtain a spun yarn (ring carded yarn) consisting of cotton fibers and having an English cotton count of 10. Table 1 shows the manufacturing conditions and composition of the spun yarn.

[0092] [Table 1]

[0093] (Example 1) Using spun yarn 1 as the face yarn, spun yarn 1 as the middle yarn, and a double yarn of spun yarn 1 and spun yarn 8 as the back yarn, a loop pile was knitted on a 30-inch 18-gauge single knitting machine for loopback fabric. The face and middle yarns formed the jersey knit surface, and the loop pile was knitted while inserting the back yarn to produce a loopback fabric. The obtained fabric was scouring and bleached using a jet dyeing machine, and the flame-retardant synthetic fibers were dyed with cationic dyes at 105°C for 30 minutes, and then the flame-retardant cellulose fibers and non-flammable cellulose fibers were dyed with reactive dyes at 60°C for 40 minutes. After neutralization with acetic acid, soaping was performed. After dewatering using a centrifugal dehydrator, a nonionic softener was applied using a padded tenter, and a finishing set was performed at 140°C for 90 seconds to obtain the fabric of Example 1. The fabric of Example 1 was a loopback fabric with a jersey knit surface and a loop pile backing.

[0094] (Example 2) Using spun yarn 4 as the face yarn, spun yarn 4 as the middle yarn, and spun yarn 4 as the back yarn, knitting, dyeing, and finishing were performed in the same manner as in Example 1 to obtain the knitted fabric of Example 2. The knitted fabric of Example 2 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0095] (Example 3) Using spun yarn 7 as the face yarn, spun yarn 7 as the middle yarn, and spun yarn 8 as the back yarn, knitting, dyeing, and finishing were performed in the same manner as in Example 1 to obtain the knitted fabric of Example 3. The knitted fabric of Example 3 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0096] (Example 4) Except for using spun yarn 2 as the face yarn, spun yarn 2 as the middle yarn, and two strands of spun yarn 1 held together as the back yarn, knitting, dyeing, and finishing were carried out in the same manner as in Example 1 to obtain the knitted fabric of Example 4. The knitted fabric of Example 4 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0097] (Example 5) Using spun yarn 7 as the face yarn, spun yarn 7 as the middle yarn, and a yarn made by holding together spun yarn 7 and spun yarn 8 as the back yarn, knitting, dyeing, and finishing were performed in the same manner as in Example 1 to obtain the knitted fabric of Example 5. The knitted fabric of Example 5 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0098] (Example 6) Except for using spun yarn 7 as the face yarn, spun yarn 7 as the middle yarn, and spun yarn 7 as the back yarn, and setting the gauge to the values ​​shown in Table 2, knitting, dyeing, and finishing were carried out in the same manner as in Example 1 to obtain the knitted fabric of Example 6. The knitted fabric of Example 6 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0099] (Example 7) Using spun yarn 6 as the face yarn, spun yarn 6 as the middle yarn, and spun yarn 5 as the back yarn, with the inch lengths set to the values ​​shown in Table 3, and except that the back yarn was inserted into the face yarn with two stitches skipped, knitting, dyeing, and finishing were carried out in the same manner as in Example 1 to obtain the knitted fabric of Example 7. The knitted fabric of Example 7 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0100] (Example 8) Using spun yarn 4 as the face yarn, spun yarn 4 as the middle yarn, and a yarn made by holding together spun yarn 4 and spun yarn 8 as the back yarn, knitting, dyeing, and finishing were performed in the same manner as in Example 1 to obtain the knitted fabric of Example 8. The knitted fabric of Example 8 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0101] (Example 9) Except for using spun yarn 3 as the face yarn, spun yarn 3 as the middle yarn, and spun yarn 8 as the back yarn, and setting the inch lengths to the values ​​shown in Table 3, knitting, dyeing, and finishing were carried out in the same manner as in Example 1 to obtain the knitted fabric of Example 9. The knitted fabric of Example 9 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0102] (Example 10) Using spun yarn 6 as the face yarn, spun yarn 6 as the middle yarn, and spun yarn 8 as the back yarn, with the inch lengths set to the values ​​shown in Table 3, and except that the back yarn was inserted into the face yarn with two stitches skipped, knitting, dyeing, and finishing were carried out in the same manner as in Example 1 to obtain the knitted fabric of Example 10. The knitted fabric of Example 10 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0103] (Comparative Example 1) The knitted fabric of Comparative Example 1 was obtained by using spun yarn 2 as the face yarn, spun yarn 2 as the middle yarn, and spun yarn 9 as the back yarn, and knitting, dyeing, and finishing in the same manner as in Example 1, except that the back yarn was inserted into the face yarn by skipping two stitches. The knitted fabric of Comparative Example 1 was a loopback knit fabric with a jersey knit on the surface layer and a loop pile on the back layer.

[0104] Tables 2 to 3 show the measurement results of the specifications, physical properties and flame retardancy of the fleece knitted fabrics of Examples 1 to 10 and Comparative Example 1. The methods for measuring the specifications, physical properties and flame retardancy of the knitted fabrics are as described later.

[0105]

Table 2

[0106]

Table 3

[0107] The methods for measuring the specifications, physical properties and flame retardancy of the knitted fabrics are described below. <Course stitch count, wale stitch count, stitch parameter> The course stitch count and wale stitch count of the obtained knitted fabric were measured in accordance with JIS L 1096:2010 8.6.2 Density of knitted fabrics. Specifically, the obtained knitted fabric was placed on a flat table to remove unnatural wrinkles and tension, then the number of wales and the number of courses per 0.5 inch (25.4 mm) at five different locations were visually counted while magnifying with a magnifying glass (magnification: 10 times). From the obtained course stitch count and wale stitch count, the stitch parameter was obtained according to the formula of [(course stitch count)×2]×[(wale stitch count)×2].

[0108] <Take-in length> From the obtained knitted fabric, 100 wales were taken out visually, the yarn length thereof was measured, and the take-in length was obtained.

[0109] <Mass per unit area> The mass per unit area was measured in accordance with JIS L 1096:2010.

[0110] <Thickness measurement using SEM images> According to the method described above, the total thickness of the knitted fabric and the thickness of the surface layer were measured from SEM images, and the difference therebetween was taken as the thickness of the back layer.

[0111] <Air permeability> The air permeability of the obtained knitted fabric was measured in accordance with JIS L 1096:2010 8.26.1 Method A (Fragile method).

[0112] <Flame retardant properties> To evaluate the flame retardancy of the obtained knitted fabric, the LOI (Limited Oxygen Index) of the knitted fabric was measured for the initial sample (unwashed sample) according to the JIS L 1091E method (E-2).

[0113] <Anti-pilling properties> To evaluate the resistance to pilling of the obtained knitted fabric, its anti-pilling properties were assessed. Anti-pilling properties were evaluated by performing a pilling test using an ICI type testing machine based on JIS L1076 Method A:2012, and confirming the degree of pilling. A higher grade in the pilling test indicates higher anti-pilling properties.

[0114] <Water absorption> In accordance with JIS L 1907:2010 7.1 Water Absorption Rate Method 7.1.1 Dropping Method, a test specimen (approximately 200 mm x 200 mm) was taken from the knitted fabric. One drop of water was dropped from a height of 10 mm from the surface of the test specimen to the tip of the burette. The time from when the water droplet reached the surface of the test specimen until the specular reflection disappeared as the specimen absorbed the water droplet was measured. The water droplet was dropped so that the surface of the backing layer became the surface of the test specimen.

[0115] <Texture> As a test piece to evaluate the feel of the knitted fabric, a piece measuring 20 cm (warp direction) x 40 cm (weft direction) was used. The knitted fabric, cut to the aforementioned size, was folded in half with the surface layers facing each other in the weft direction. Five male monitors with experience in developing clothing and textile products touched the back of the knitted fabric and evaluated its "softness (softness against the skin)" using the following five-point scale, and the average value was calculated. A higher average value indicates a more flexible feel against the skin. [Evaluation Criteria *5-point scale from 1 to 5] 5: Very soft 4: Soft 3: Normal 2: Hard 1: Very hard

[0116] All of the knitted fabrics in the examples are W CB If R is greater than 0 and less than or equal to 80.0, SB The ratio was 0.71 or higher, and the LOI value was 25 or higher. In contrast, the knitted fabric of Comparative Example 1, despite having a higher proportion of flame-retardant fibers in the entire fabric than that of Example 10, had an LOI value below 25 and did not exhibit sufficient flame retardancy. This is because W CB This is thought to be due to the fact that the value exceeded 80. Among the knitted fabrics of the examples, Examples 3, 9, and 10, in which the back layer was composed solely of cotton fibers, all showed excellent feel against the skin and high water absorption. Example 5, in which the proportion of cotton fibers in the back layer was relatively large, showed a similar trend. In Example 8, the proportion of flame-retardant fibers, flame-retardant cellulose fibers, and non-flammable cellulose fibers in each layer was the same as in Example 5, but the difference in feel against the skin is thought to be due to the fact that the spun yarn used for the back yarn was compact yarn in Example 5 and MVS yarn in Example 8.

[0117] This embodiment includes the following aspects. (Aspect 1) A multilayered knitted fabric having two or more layers, including a surface layer knitted with face yarn and a back layer knitted with back yarn, Includes flame-retardant fibers and non-flammable fibers, When the mass of the knitted fabric is taken as 100% by mass, the flame-retardant fibers are contained in a proportion of 40% by mass or more and 80% by mass or less. The aforementioned non-flammable fiber includes a non-flammable cellulose fiber, The backing layer contains non-flammable fibers, and the proportion of non-flammable cellulose fibers among the non-flammable fibers contained in the backing layer is 60% by mass or more. The weight (g / m²) of the aforementioned knitted fabric 2 Let ) be A, The cross-weave ratio (%) of the aforementioned back yarn is I B year, The proportion (by mass) of non-flammable fibers in the aforementioned backing layer is C B year, Let T be the ratio (%) of the thickness of said back layer to the total thickness of said knitted fabric determined from a SEM image B , where W calculated by the following formula 1 CB is greater than 0 and 80.0 or less. A knitted fabric. W CB = A × (I B / 100) × (C B / 100) × (T B / 100) (Formula 1) (Aspect 2) Let M be the ratio (% by mass) of flame-retardant fibers in said front layer S , let the interknitting ratio (%) of said back yarn be I B and 100-I obtained by subtracting I from 100 B be taken as I S , let T be the ratio (%) of the thickness of said front layer to the total thickness of said knitted fabric determined from a SEM image S , when W calculated by the following formula 2 MS is the ratio of said W CB to W obtained by the following formula 3, let R SB be 0.71 or more. The knitted fabric according to Aspect 1. W MS = A × (I S / 100) × (M S / 100) × (T S / 100) (Formula 2) R SB = W MS / W CB (Formula 3) (Aspect 3) The ratio (% by mass) of non-flame-retardant fibers in said front layer is smaller than the ratio (% by mass) of non-flame-retardant fibers in said back layer. The knitted fabric according to Aspect 1 or 2. (Aspect 4) Said knitted fabric contains said non-flame-retardant cellulosic fibers in a proportion of 20% by mass or more and 60% by mass or less. The knitted fabric according to any one of Aspects 1 to 3. (Aspect 5) When the mass of said front layer is taken as 100% by mass, said front layer contains said flame-retardant fibers in a proportion of 50% by mass or more, A knitted fabric according to any of embodiments 1 to 4, wherein the backing layer contains 20% or more of the non-flammable cellulose fibers when the mass of the backing layer is 100% by mass. (Aspect 6) A knitted fabric according to any of embodiments 1 to 5, wherein the flame-retardant fiber is at least one selected from the group consisting of modacrylic fiber, flame-retardant polyester fiber, flame-retardant polyolefin fiber, flame-retardant polyamide fiber, flame-retardant polycarbonate fiber, and flame-retardant regenerated cellulose fiber. (Aspect 7) A knitted fabric according to any of embodiments 1 to 6, wherein the flame-retardant cellulose fiber is at least one selected from the group consisting of cotton fibers, hemp fibers, viscose rayon fibers, refined cellulose fibers, and acetate fibers. (Pattern 8) The aforementioned knitted fabric is one or more selected from the group consisting of fleece knitted fabric, brushed knitted fabric, double knitted fabric, double jersey knitted fabric, inlay knitted fabric, and inlay brushed knitted fabric. Weight: 120g / m 2 More than 700g / m 2 The following: A knitted fabric according to any of embodiments 1 to 7, wherein the overall thickness of the knitted fabric is 0.5 mm or more and 5.0 mm or less. (Aspect 9) The aforementioned knitted fabric is one or more selected from the group consisting of rib knit fabric and smooth knit fabric. Weight: 120g / m 2 More than 700g / m 2 The following: A knitted fabric according to any of embodiments 1-2 or 4-7, wherein the overall thickness of the knitted fabric is 0.5 mm or more and 5.0 mm or less. (Aspect 10) Clothing containing a knitted fabric of any of the embodiments 1 to 9. [Industrial applicability]

[0118] The knitted fabric of this disclosure exhibits flame retardancy and has excellent texture, possessing a good feel and texture due to its non-flammable cellulose fibers, making it suitable for use in various types of clothing. Clothing including the knitted fabric of this disclosure is also suitable for wearing during outdoor leisure activities that involve fire, such as barbecues and bonfires.

Claims

1. A multilayered knitted fabric having two or more layers, including a surface layer knitted with face yarn and a back layer knitted with back yarn, Includes flame-retardant fibers and non-flammable fibers, When the mass of the knitted fabric is taken as 100% by mass, the flame-retardant fibers are contained in a proportion of 40% by mass or more and 80% by mass or less. The aforementioned non-flammable fiber includes a non-flammable cellulose fiber, The backing layer contains non-flammable fibers, and the proportion of non-flammable cellulose fibers among the non-flammable fibers contained in the backing layer is 60% by mass or more. The weight (g / m²) of the aforementioned knitted fabric ２ Let ) be A, The cross-weave ratio (%) of the aforementioned back yarn is I Ｂ year, The proportion (by mass) of non-flammable fibers in the aforementioned backing layer is C Ｂ year, The ratio (%) of the thickness of the backing layer to the total thickness of the knitted fabric, determined by SEM images, is T Ｂ In that case, W can be calculated using the following formula 1. CB A knitted fabric in which the value is greater than 0 and less than or equal to 80.

0. W CB =A×(I) Ｂ / 100)×(C Ｂ / 100)×(T) Ｂ / 100) (Formula 1)

2. The proportion (by mass) of flame-retardant fibers in the aforementioned surface layer is M Ｓ year, The cross-weave ratio (%) of the aforementioned back yarns I Ｂ Subtracting 1 from 100 gives 100-I Ｂ to I Ｓ year, The ratio (%) of the thickness of the surface layer to the total thickness of the knitted fabric, determined by SEM images, is T Ｓ In that case, W can be calculated using the following formula 2. MS The aforementioned W CB R, which is the ratio to the given value, can be calculated using the following formula 3. SB The knitted fabric according to claim 1, wherein the ratio is 0.71 or greater. W MS =A×(I Ｓ / 100)×(M Ｓ / 100)×(T Ｓ / 100) (Formula 2) R SB =W MS / W CB (Equation 3)

3. The knitted fabric according to claim 1 or 2, wherein the proportion (by mass) of non-flammable fibers in the surface layer is smaller than the proportion (by mass) of non-flammable fibers in the back layer.

4. The knitted fabric according to claim 1 or 2, wherein the knitted fabric contains the non-flammable cellulose fibers in a proportion of 20% by mass or more and 60% by mass or less.

5. The surface layer contains the flame-retardant fibers in a proportion of 50% by mass or more, when the mass of the surface layer is 100% by mass. The knitted fabric according to claim 1 or 2, wherein the backing layer contains the non-flammable cellulose fibers in a proportion of 20% by mass or more, when the mass of the backing layer is 100% by mass.

6. The knitted fabric according to claim 1 or 2, wherein the flame-retardant fiber is at least one selected from the group consisting of modacrylic fiber, flame-retardant polyester fiber, flame-retardant polyolefin fiber, flame-retardant polyamide fiber, flame-retardant polycarbonate fiber, and flame-retardant regenerated cellulose fiber.

7. The knitted fabric according to claim 1 or 2, wherein the flame-retardant cellulose fiber is at least one selected from the group consisting of cotton fibers, hemp fibers, viscose rayon fibers, refined cellulose fibers, and acetate fibers.

8. The aforementioned knitted fabric is one or more selected from the group consisting of fleece knitted fabric, brushed knitted fabric, double knitted fabric, rib knitted fabric, smooth knitted fabric, double jersey knitted fabric, inlay knitted fabric, and inlay brushed knitted fabric. Weight: 120 g / m ２ 700g / m or more ２ The following: The knitted fabric according to claim 1 or 2, wherein the overall thickness of the knitted fabric is 0.5 mm or more and 5.0 mm or less.

9. A garment comprising the knitted fabric according to claim 1 or 2.

Images