Flame-retardant fabrics for uniforms and outerwear uniforms containing the same

Abstract

This invention provides a flame-retardant fabric for uniforms that has flame retardancy and good breathability, and an outer garment uniform containing the same. [Solution] A flame-retardant fabric for uniforms containing cellulose fibers, wherein the afterflame time is within 2.0 seconds and the dust time is within 2.0 seconds according to ISO 15025 B method, and the air permeability as defined in JIS L 1096:2010 Fragile method is 20 cm 3 / cm 2 The flame-retardant fabric for uniforms has a flame-retardant properties of 1 / s or higher, and the outer garment uniform contains the same. The cellulose fiber is preferably made of cotton. The flame-retardant cellulose fiber is preferably treated with a phosphate-based flame retardant process. Furthermore, the flame-retardant fabric for uniforms preferably contains conductive fibers.

Description

[Technical Field]

[0001] This invention relates to flame-retardant fabrics for uniforms and outerwear uniforms containing the same. [Background technology]

[0002] Traditionally, work uniforms have been required to be flame-retardant. Even without the occurrence of flames, flame retardancy is essential to protect workers from risks such as static electricity and electrical fires. However, using flame-retardant synthetic fibers to create fabric makes the material stiff and uncomfortable for workers. Therefore, to improve comfort, fabrics are made by blending flame-retardant fibers with natural fibers, or by processing natural fibers with chemicals that impart flame retardancy, thus achieving both comfort and flame retardancy. Patent Document 1 proposes flame-retardant fibers containing halogen-containing fibers with antimony oxide as the main flame retardant, cellulose fibers, and para-aramid fibers. Patent Document 2 proposes a fabric containing flame-resistant viscose fibers. Patent Document 3 proposes a flame-retardant fabric containing flame-retardant vinylon fibers, polyamide fibers, and cellulose fibers. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 08-226031 [Patent Document 2] Japanese Patent Publication No. 2020-139254 [Patent Document 3] Japanese Patent Publication No. 2020-139254 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] However, these conventional technologies had problems such as insufficient flame retardancy and insufficient breathability.

[0005] To solve the aforementioned conventional problems, the present invention provides a flame-retardant fabric for uniforms having good flame retardancy and breathability, and an outer garment uniform containing the same. [Means for solving the problem]

[0006] One embodiment of the present invention is a flame-retardant fabric for uniforms containing cellulose fibers, wherein the afterflame time is 2.0 seconds or less and the dust time is 2.0 seconds or less according to ISO 15025 B method, and the air permeability as defined in JIS L 1096:2010 Fragile method is 20 cm². 3 / cm 2 Regarding flame-retardant fabrics for uniforms with a flame resistance of / s or higher.

[0007] Another embodiment of the present invention relates to an outer garment uniform including the aforementioned flame-retardant fabric for uniforms. [Effects of the Invention]

[0008] The flame-retardant fabric for uniforms of the present invention is a flame-retardant fabric for uniforms containing cellulose fibers, wherein the afterflame time is 2.0 seconds or less and the dust time is 2.0 seconds or less according to ISO 15025 B method, and the air permeability as defined in JIS L 1096:2010 Fragile method is 20 cm². 3 / cm 2 By having a coefficient of s or higher, it is possible to provide a flame-retardant fabric for uniforms that has good flame retardancy and breathability, as well as an outer garment uniform containing the same. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram illustrating the fabric structure of one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram illustrating the fabric structure of another embodiment of the present invention. [Modes for carrying out the invention]

[0010] The present invention relates to a flame-retardant fabric for uniforms containing cellulosic fibers. Cellulosic fibers include natural cellulosic fibers and regenerated cellulosic fibers, among which natural cellulosic fibers are preferred, and cotton is particularly preferred. Cotton is environmentally friendly, and excellent in texture, dyeability, water absorbency, wearing comfort and the like, so it is favorable as uniform apparel. The fabric preferably contains 30% by mass or more of cellulosic fibers, more preferably 40% by mass or more.

[0011] The fabric of the present invention has an afterflame time of 2.0 seconds or less and an afterglow time of 2.0 seconds or less in ISO 15025 Method B, and an air permeability specified in JIS L 1096:2010 Frazier method of 20 cm 3 / cm 2 / s or more. Further, the air permeability specified in JIS L 1096:2010 Frazier method is preferably 20 cm 3 / cm 2 / s or more, more preferably 30 cm 3 / cm 2 / s or more. Thereby, the fabric has high flame retardancy and good air permeability, and is suitable as a uniform.

[0012] The flame-retardant cellulosic fibers are preferably subjected to phosphoric acid-based flame-retardant processing. As the phosphoric acid-based flame-retardant processing, flame-retardant cotton such as Proban processing (processing in which a tetrakishydroxymethylphosphonium salt is adhered to cotton by an ammonia curing method) and Pyrovatex CP processing (N-methylol dimethylphosphonopropionamide processing) can be used. The oxygen index (OI) is 26 or more. These processings can be performed in the state of cotton, fiber bundles, yarns or fabrics.

[0013] The flame-retardant fabric for uniforms preferably further contains conductive fibers. When the total amount of fibers other than the conductive fibers is taken as 100% by mass, the content of the conductive fibers is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and still more preferably 1.5% by mass or less. The inclusion of conductive fibers can suppress the risk of ignition due to static electricity, and is suitable for work uniforms.

[0014] The flame-retardant fabric for uniforms is preferably composed of a blended spun yarn containing cellulosic staple fibers and flame-retardant modacrylic staple fibers. Examples of the flame-retardant modacrylic staple fibers include commercially available Protex (registered trademark) M, having a fineness of 2.2 decitex, a fiber length of 51 mm, and an LOI value of 32. In the flame-retardant fabric for uniforms, the weight proportion of the flame-retardant modacrylic fibers is preferably 40% by mass or more. Preferably, when the total mass of the flame-retardant fabric for uniforms is taken as 100% by mass, the cellulosic staple fibers preferably account for 40 to 60% by mass, and the flame-retardant modacrylic fibers preferably account for 40 to 60% by mass. In the case of a blended spun yarn containing cellulosic staple fibers and flame-retardant modacrylic staple fibers, the cellulosic staple fibers may be flame-retardant treated products or non-flame-retardant treated products. This is because the flame retardancy of the flame-retardant modacrylic staple fibers themselves imparts flame retardancy to the flame-retardant fabric for uniforms.

[0015] The flame-retardant fabric for uniforms may further contain high-strength fibers. The inclusion of high-strength fibers can enhance the strength of the fabric. Examples of the high-strength fibers include aramid (including para-type and meta-type) fibers, and specific examples include Kevlar (registered trademark). The high-strength fibers are preferably contained in an amount of 15% by mass or less, more preferably 10% by mass or less, based on the entire fabric. When the total mass of the flame-retardant fabric for uniforms is taken as 100% by mass, it is preferred that the cellulosic staple fibers account for 40 to 60% by mass, the flame-retardant modacrylic fibers account for 40 to 60% by mass, and the high-strength fibers account for 5 to 15% by mass, and it is more preferred that the cellulosic staple fibers account for 40 to 60% by mass, the flame-retardant modacrylic fibers account for 40 to 60% by mass, and the high-strength fibers account for 5 to 10% by mass. By setting such a ratio, the strength can be improved while suppressing the deterioration of the touch feel of the flame-retardant fabric, which is suitable for work uniforms.

[0016] The outerwear uniform of the present invention includes the aforementioned flame-retardant fabric. This outerwear uniform includes upper garments or lower garments, and the upper garments are long-sleeved, three-quarter-sleeved, short-sleeved and the like, and the lower garments are long trousers, three-quarter-length trousers, shorts and the like.

[0017] The type of spun yarn used in the fabric of the present invention is not limited to ring-spun yarn, air-spun yarn (bound-spun yarn), open-end spun yarn, etc. The thickness of this spun yarn is preferably 10 to 40 count in English cotton count.

[0018] The fabrics of the present invention are preferably plain weave, twill weave (diagonal weave), satin weave, modified plain weave, modified diagonal weave, modified satin weave, modified weave, patterned weave, single overlap weave, double structure, multi-layer structure, warp pile weave, weft pile weave, leno weave, or modified weaves that combine these. Among these, a variation weave combining plain weave and twill weave (diagonal weave) is preferred.

[0019] The mass per unit area (basis weight) of the aforementioned fabric is 80-300 g / m². 2 Preferably, and more preferably, 90-250 g / m² 2 And more preferably 100-250 g / m² 2 Within the aforementioned range, it is suitable as uniform clothing.

[0020] The yarn density of the fabric is preferably 30 to 90 threads / inch, and more preferably 40 to 80 threads / inch. The yarn count of the fabric is preferably 10 to 40. Within the above ranges of yarn density and yarn count, the breathability of the fabric with the modified weave described in this application is suitable.

[0021] Figure 1 is a schematic diagram illustrating a modified weave structure combining plain weave and twill weave (diagonal weave) according to one embodiment of the present invention. In Figure 1, floating warp threads are shown in black, and sinking threads are shown in white. By using such a structure diagram, good breathability can be obtained regardless of whether or not the fabric is treated with flame retardant.

[0022] Figure 2 is a schematic diagram illustrating one embodiment of a fabric combining plain weave and twill weave, and further including conductive fiber yarn. Specifically, this modified weave consists of three rows of plain weave + one row of 1 / 2 twill weave + one row of 1 / 3 satin weave with conductive fiber yarn as the warp + one row of 1 / 2 twill weave from left to right in Figure 2. It is constructed by adding one warp thread of conductive fiber yarn in a satin weave to the structure diagram of Figure 1. In structure diagram 2, floating warp threads are shown in black, sinking warp threads in white, and conductive fiber yarns are shown in diagonal lines. [Examples]

[0023] The following will be explained using examples. However, the present invention is not limited to the following examples. [Evaluation Method] <Flame-retardant> Afterflame time and dust time were measured according to ISO 15025 Method B. <Breathability> The air permeability was measured according to the Fragile method specified in JIS L 1096:2010. <Other physical properties> The measurements were taken using methods commonly used in this industry.

[0024] (Example 1) Using 100% cotton, 20-count (English cotton count) yarn for the warp and 100% cotton, 20-count (English cotton count) yarn for the weft, a fabric was woven on a dobby loom using a 3-row plain weave + 2-row 2 / 1 twill weave as shown in Figure 1. The resulting fabric had a warp density of 73 threads / inch, a warp density of 60 threads / inch, and a mass (weight) of 175 g / m². 2 The fabric was then woven, refined, bleached, and dyed, followed by flame retardant treatment using tetrakishydroxymethylphosphonium salt cured with ammonia. Finishing was then performed. The resulting fabric had a weight (basis weight) of 190.8 g / m². 2 The breathability is 32.0 cm. 3 / cm 2 The average afterflame time was 0.5 seconds longitude and 0.5 seconds latitude, and the average afterdust time was 0.0 seconds longitude and 0.0 seconds latitude. When this fabric was sewn into work clothes and tested, it was found to have high flame resistance, good breathability, and a comfortable fit.

[0025] (Example 2) The procedure was the same as in Example 1, except that the yarn was treated with a flame retardant finish at the spinning stage, but the woven fabric was not. When this fabric was sewn into work clothes and tested, it showed high flame retardancy, good breathability, and good comfort.

[0026] (Example 3) A blended spun yarn (22.5 count) of 45% modacrylic staple fibers (Protex M) and 55% cotton was used as the warp thread, and a blended spun yarn (16 count) of 55% modacrylic staple fibers (Protex M), 35% cotton, and 10% Kevlar® staple fibers was used as the weft thread. A fabric was woven on a dobby loom using the three-row plain weave + one row 2 / 1 twill weave + one row 3 / 1 satin weave + one row 2 / 1 twill weave shown in Figure 2. The warp threads for the 3 / 1 satin weave sections were made of conductive polyester yarn. The resulting fabric had a warp density of 65 threads / inch, a warp density of 47 threads / inch, and a mass (basis weight) of 149 g / m². 2 The ratio of each material is cotton:modacrylic:Kevlar(registered trademark):conductive yarn (polyester) = 51:43:5:1, and the breathability is 56.3cm. 3 / cm 2 The average afterflame time was 0.4 seconds longitude and 0.5 seconds latitude, and the average afterdust time was 0.0 seconds longitude and 0.0 seconds latitude.

[0027] As is clear from Examples 1-3 above, the textiles and work clothes of each example had high flame retardancy, good breathability, and were comfortable to wear. [Industrial applicability]

[0028] The flame-retardant fabric for uniforms of the present invention is suitable for work clothes. Furthermore, when it contains conductive fibers, it is suitable for work clothes in hazardous materials handling sites such as petrochemical complexes and oil drilling sites.

Claims

1. Flame-retardant fabric for uniforms containing cellulose fibers, In ISO 15025 Method B, the afterflame time is within 2.0 seconds and the dust time is within 2.0 seconds. The air permeability specified in JIS L 1096:2010 Fragile method is 20 cm. 3 / cm 2 A flame-retardant fabric for uniforms characterized by having a coefficient of s or higher.

2. The flame-retardant fabric for uniforms according to claim 1, wherein the cellulose fiber is a natural cellulose fiber.

3. The flame-retardant woven fabric for uniforms according to claim 1 or 2, wherein the flame-retardant cellulose fiber is subjected to a phosphate-based flame-retardant treatment.

4. The flame-retardant fabric for uniforms according to claim 1 or 2, further comprising conductive fibers.

5. The flame-retardant fabric for uniforms according to claim 1 or 2, wherein the flame-retardant fabric for uniforms is composed of a blended spun yarn containing cellulose-based short fibers and flame-retardant modacrylic short fibers.

6. An outer garment uniform comprising a flame-retardant fabric for uniforms as described in any one of claims 1 to 5.

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