Fibers, yarns and blended yarns, and textile structures

Abstract

To provide a fiber or the like using vegetable silica excellent in safety and heat storage performance, in which vegetable silica hardly drops off.SOLUTION: A fiber is made by containing impalpable powders of vegetable silica. In this case, it is preferable that the vegetable silica be amorphous silica. In addition, it is preferable that the impalpable powders of vegetable silica have an average particle diameter of 0.1-10 μm. Further, it is preferable that the impalpable powders of vegetable silica is contained in an amount of 0.5-15 wt.%. Furthermore, it is preferable that the fiber contains impalpable powders of carbon.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to fibers, yarns, blended yarns, and fiber structures, and more particularly to fibers containing vegetable silica. [Background technology]

[0002] Functional supports with silica attached have been proposed.

[0003] For example, Patent Document 1 listed below describes "a supporter that is designed to be worn on a specific part of the body, and has a supporter body made of a stretchable material, and the supporter body is characterized in that it contains or has attached thereto a powdered vegetable powder of vegetable black silica extracted from rice husks that have been burned at a high temperature exceeding 1000°C." As a specific configuration, it describes a configuration in which multiple circular pieces of vegetable powder are attached to the surface of the supporter body that comes into contact with the skin. It also states, "According to this invention, it is possible to provide a supporter that can more effectively generate terahertz waves, which are electromagnetic waves that can be felt as warmth as far infrared rays."

[0004] Silica can be broadly divided into mineral-derived silica (mineral silica) and plant-derived silica (vegetable silica). Silica takes on various crystalline structures depending on temperature and pressure conditions, with mineral silica contained in minerals such as quartz being crystalline, and vegetable silica contained in plant materials such as unburned rice husks being amorphous. Traditionally, mineral silica, which is the second most widely produced after feldspar, has been used as an industrial raw material. However, in recent years, plant-based silica has been attracting attention as an amorphous silica that is considered safe and compatible with humans. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3210843 (Claim 1, Effect of Invention, Paragraph 0013) Summary of the Invention [Problem to be solved by the invention]

[0006] In the above Patent Document 1, multiple circular pieces of vegetable powder are attached to the surface of the supporter body that comes into contact with the skin, but with this configuration, the vegetable powder (vegetable silica) can fall off due to repeated use or washing.

[0007] The present invention aims to solve the above-mentioned problems and to provide fibers, yarns, blended yarns, and textile structures that are less likely to lose vegetable silica. Another object of the present invention is to provide fibers, yarns, blended yarns, and textile structures that use such vegetable silica and are safe and have excellent heat storage properties. [Means for solving the problem]

[0008] To solve the above problems, a fiber containing fine powder of vegetable silica was developed. As mentioned above, vegetable silica is silica contained in vegetable materials such as rice husks and rice straw, and silica present in unburned vegetable materials is amorphous. Vegetable silica is contained in large amounts in combustion products obtained by burning or pyrolyzing vegetable materials. Such combustion products usually contain other components as impurities in addition to vegetable silica. Furthermore, because amorphous silica can be converted to crystalline by high-temperature heating, the term "vegetable silica" is intended to include both amorphous and crystalline silica derived from plants.

[0009] This fiber is resistant to shedding of vegetable silica, as the fine powder of vegetable silica is kneaded into the polymer in the fiber.

[0010] Here, the vegetable silica may be amorphous silica in the form of fiber.

[0011] This fiber is highly safe. Amorphous silica is widely used as a food additive, health food, and drinking water, and has a proven track record of safety. For example, silica obtained by burning plant materials at low temperatures becomes amorphous silica. Although silica has a Mohs hardness of 7, amorphous silica has a lower density than crystalline silica and tends to be easier to grind than crystalline silica. Therefore, by using amorphous silica, the grinding time can be shortened to some extent.

[0012] Furthermore, the fine powder of vegetable silica can also be made into fibers having an average particle size of 0.1 to 10 μm.

[0013] This fiber improves productivity. If the average particle size exceeds 10 μm, clogging of the spinning filter and thread breakage are likely to occur, and various problems such as thread breakage and wear of guides during the drawing process are likely to occur. On the other hand, if the average particle size is less than 0.1 μm, secondary aggregation is likely to occur. The average particle size of the fine powder of vegetable silica is more preferably 0.15 to 5 μm, even more preferably 0.2 to 3 μm, and most preferably 0.2 to 1 μm.

[0014] Furthermore, it can also be made into fibers containing 0.5 to 15% by weight of fine powder of vegetable silica.

[0015] This fiber has excellent heat storage capacity and productivity (spinnability). By having a vegetable silica fine powder content of 0.5% by weight or more, excellent heat storage capacity can be achieved. Furthermore, by having a vegetable silica fine powder content of 15% by weight or less, thread breakage during spinning is unlikely to occur, resulting in excellent productivity.

[0016] It may also be made into a fiber containing fine powder of carbon.

[0017] The heat storage capacity of this fiber is further improved by the inclusion of carbon. For example, if the combustion product (containing a large amount of vegetable silica) obtained by burning vegetable materials contains carbon, this carbon can be incorporated into the fiber together with the vegetable silica.

[0018] Furthermore, it is also possible to make fibers containing 0.5 to 13.0 parts by weight of fine carbon powder relative to 100 parts by weight of fine vegetable silica powder.

[0019] This fiber has further improved heat storage capacity.The content of the fine carbon powder in the fine vegetable silica powder is preferably 1 to 8% by weight, more preferably 2 to 6% by weight.

[0020] The above-mentioned problems can also be solved by a fiber containing fine powder of amorphous silica and fine powder of carbon, wherein the fiber contains 0.5 to 15 weight % of fine powder of amorphous silica and 0.5 to 13.0 weight parts of fine powder of carbon per 100 weight parts of fine powder of amorphous silica.

[0021] The above-mentioned problems can also be solved by a fiber containing a fine powder of a combustion product obtained by burning or pyrolyzing a silica-containing plant material such as rice husk, the fine powder of the combustion product containing 0.5 to 15 wt % of amorphous silica fine powder and 0.5 to 13.0 wt parts of carbon fine powder per 100 wt parts of the amorphous silica fine powder. The combustion product includes a combustion product obtained by burning a silica-containing plant material and a pyrolyzed product obtained by pyrolyzing the silica-containing plant material.

[0022] The fiber may also be a core-sheath type composite fiber consisting of a core and a sheath, with the fine powder of vegetable silica contained only in the core.

[0023] This fiber contains fine powder of vegetable silica only in the core, which makes it less likely to break during spinning, further improving productivity.

[0024] The above-mentioned problems can also be solved by a yarn using any of the fibers described above, or a fiber structure using such a yarn at least in part.

[0025] The above-mentioned problems can also be solved by a blended yarn obtained by blending any of the staple fibers described above with staple fibers that do not contain vegetable silica fine powder. In this case, the blended yarn can be made such that the staple fibers that do not contain vegetable silica fine powder are staple fibers that have a deodorizing function. Furthermore, the above problem can also be solved by a blended yarn containing 10 to 30% by weight of short fibers of any of the fibers described above and 10 to 90% by weight of short fibers of fibers that do not contain vegetable silica fine powder. In addition, the above-mentioned problems can also be solved by a fiber structure at least partly using any of the blended yarns described above. [Effects of the Invention]

[0026] The present invention can provide fibers, yarns, blended yarns, and textile structures that are resistant to shedding of vegetable silica. It can also provide fibers, yarns, blended yarns, and textile structures that use such vegetable silica and are safe and have excellent heat storage properties. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a diagram illustrating an example of an evaluation device for heat storage and heat retention properties. DETAILED DESCRIPTION OF THE INVENTION

[0028] The fibers, yarns, blended yarns, and textile structures will be described below by way of example. It should be noted that the following embodiments and examples are merely illustrative of the present invention, and the present invention is not limited to the following specific embodiments and examples.

[0029] 1. Fiber The fibers contain fine powder of vegetable silica. First, examples of vegetable silica will be described, and then examples of fibers containing fine powder of vegetable silica will be described.

[0030] [Plant-based silica] As mentioned above, vegetable silica is silica originally contained in plant materials such as rice husks and rice straw. For example, rice husks are said to contain approximately 15 to 20% by weight of silica (SiO2). To extract vegetable silica from silica-containing plant materials such as rice husks and rice straw, the plant materials can be burned or pyrolyzed, for example. The resulting burned plant material will contain a large amount of vegetable silica. The vegetable silica content in the burned plant material will vary depending on the combustion conditions, but will be, for example, 70% by weight or more, 75% by weight or more, 80% by weight or more, 85% by weight or more, or 90% by weight or more.

[0031] The vegetable silica contained in the fiber is preferably amorphous silica. The vegetable silica present in unburned vegetable materials is essentially amorphous, but depending on the combustion temperature, it can crystallize and contain a large amount of crystalline silica. For example, due to the influence of alkali metals contained in small amounts in rice husks, crystallization can progress at combustion temperatures of about 800°C or higher. Therefore, to prevent the crystallization of vegetable silica, it is usually necessary to keep the combustion temperature below about 700°C.

[0032] [carbon] The fibers may contain fine carbon powder. The fine carbon powder is not particularly limited, and for example, commercially available fine graphite powder or graphite powder may be used.

[0033] However, the burned plant material usually contains unburned carbon along with silica, although this depends on the combustion conditions, etc. Therefore, the carbon contained in the burned plant material can be utilized. From this viewpoint, it is preferable to burn the plant material under conditions such that the carbon content in the burned plant material is 0.5 to 13.0 parts by weight per 100 parts by weight of amorphous silica. However, since the combustion of plant materials containing a relatively large amount of unburned carbon has a high impurity content and a low silica content, it has been avoided. Therefore, in order to increase the purity of plant silica, it has traditionally been burned at temperatures above 600°C to minimize the carbon remaining.

[0034] In order to increase the carbon content in the burned plant material, it is preferable to burn the plant material at a relatively low temperature of 600°C or less, unlike conventional combustion temperatures. The combustion temperature of the plant material is more preferably 350 to 550°C, and most preferably 400 to 500°C.

[0035] Alternatively, the plant material can be thermally decomposed rather than burned. The thermal decomposition temperature of the plant material is preferably 600°C or lower. The thermal decomposition temperature of the plant material is more preferably 350 to 550°C, and most preferably 400 to 500°C. The thermal decomposition time of the plant material can be, for example, about 30 minutes to 1 hour, 2 to 10 hours, 10 to 24 hours, 1 to 2 days, 2 to 4 days, 4 to 8 days, or 8 to 10 days.

[0036] In addition to the carbon contained in the burned plant material, commercially available carbon fine powder can also be used.

[0037] [Fine powder] The vegetable silica obtained by the above-mentioned method or the like is pulverized into a fine powder. Various methods can be used for pulverization. In this case, it is preferable to pulverize the vegetable silica fine powder so that the particle size of the fine powder becomes an average particle size (d50: cumulative 50% particle size) of 0.1 to 10 μm. The fine powder of vegetable silica thus obtained is used to produce fibers containing a predetermined amount of the same.

[0038] Furthermore, by pulverizing the combustion product of a plant-based material containing plant silica and carbon, it is possible to simultaneously pulverize the plant silica and the carbon. In this case, the particle size of the carbon powder is usually smaller than that of the plant silica powder. It is preferable to pulverize the carbon powder so that the average particle size (d50: cumulative 50% particle size) is 0.05 to 10 μm. It is preferable that the pulverized combustion product contains 0.5 to 15 wt % amorphous silica powder and 0.5 to 13.0 wt parts carbon powder per 100 wt parts amorphous silica powder.

[0039] [polymer] The polymer constituting the fiber, i.e., the polymer into which the vegetable silica fine powder or the like is kneaded, is not particularly limited. In consideration of the spinnability during spinning and the physical properties of the yarn, polyethylene terephthalate, nylon 6, nylon 66, etc. are preferred. Furthermore, when the fiber cross section is to be a core-sheath type fiber consisting of a core component and a sheath component, for example, two types of polymers can be selected from the above, one of which can be the core component polymer and the other the sheath component polymer.

[0040] [Fibrosis] The fine powder of vegetable silica or the like is added to the polymer. At this time, fine powder of combustion products obtained by burning or pyrolyzing vegetable materials (including fine powder of vegetable silica as well as fine powder of carbon or the like) can be added to the polymer. In the case of core-sheath fibers, the vegetable silica fine powder or the like may be added to either the core polymer or the sheath polymer. It can also be added to both the core polymer and the sheath polymer. Furthermore, vegetable silica fine powder or the like can be added only to the core polymer, which is then covered with the sheath polymer, to form a so-called core-sheath fiber.

[0041] When a core-sheath fiber is used, the ratio (weight ratio) of the sheath component to the core component is preferably in the range of 4:1 to 1:4, more preferably in the range of 3:1 to 1:3, and most preferably in the range of 2:1 to 1:1. Furthermore, the core component does not need to be a single core in the fiber, and may be two or more cores. Furthermore, a portion of the core component may be exposed on the fiber surface, or the core component may be covered by the sheath component.

[0042] There are no particular limitations on the method for adding the fine powder of vegetable silica to the thermoplastic polymer, but from the viewpoint of uniform dispersion, a method of forming master chips using a twin-screw extruder is preferred. The timing of adding the vegetable silica fine powder is not particularly limited. It can be added to the reaction system at the beginning of polymerization and directly spun. Alternatively, the vegetable silica fine powder can be kneaded into the molten polymer in a so-called post-addition method. Furthermore, a so-called masterbatch method can be used, in which master chips containing a high concentration of vegetable silica fine powder are used.

[0043] The amount of finely powdered vegetable silica added is preferably 0.5 to 15.0% by weight of the fiber, more preferably 0.5 to 10.0% by weight of the fiber, and even more preferably 0.5 to 5.0% by weight of the fiber.

[0044] In addition to the vegetable silica fine powder, the fiber of the present invention may contain carbon fine powder, various stabilizers, pigments, dyes, inorganic additives, etc. It is preferable that the fiber contains 0.5 to 13.0 parts by weight of carbon fine powder per 100 parts by weight of the vegetable silica fine powder.

[0045] To produce fibers, the above materials can be used in the usual fiber production process as is. The fiber thickness is preferably in the range of 0.5 to 15 decitex.

[0046] The cross-sectional shape of the fibers is not particularly limited, and may be a circular cross section, or may be a polygonal cross section such as a triangular or hexagonal cross section, a T-shaped cross section, or a U-shaped cross section.

[0047] 2. Yarn and blended yarn The above fibers can be spun by themselves to form yarns, or can be cut into staple fibers and blended with other staple fibers to form blended yarns.

[0048] The fibers can be shortened by conventional methods. The fiber length is preferably 25 to 150 mm, more preferably 35 to 100 mm, and most preferably 40 to 60 mm. For example, in the case of 3.3 dtex, the number of crimps is preferably 12 to 15 per inch, and the crimp percentage is preferably about 10%.

[0049] The fibers to be blended with the above-mentioned fibers containing fine powder of vegetable silica are not particularly limited, and examples thereof include fibers having a deodorizing function, aramid fibers, hollow fibers, and the like.

[0050] The fiber having a deodorizing function is not particularly limited as long as it has a deodorizing function. For example, a deodorizing fiber made of a thermoplastic polymer containing a phosphate of a tetravalent metal, a hydroxide of a divalent metal, and a photocatalyst can be used. Specifically, for example, the deodorizing fiber has a core-sheath composite structure consisting of a core and a sheath, the core being made of a thermoplastic polymer with a melting point of 150°C or higher, the sheath being made of polybutylene terephthalate, and the sheath containing a phosphate of a tetravalent metal, a hydroxide of a divalent metal, a photocatalyst, and an antioxidant can be used.

[0051] Examples of aramid fibers include meta-aramid fibers and para-aramid fibers. Among these, para-aramid fibers are preferred due to their excellent cut resistance and heat resistance. Examples of such para-aramid fibers include polyparaphenylene terephthalamide fibers (manufactured by DuPont-Toray Co., Ltd., trade name: Kevlar (registered trademark)) and copolyparaphenylene-3,4'-diphenyl ether terephthalamide fibers (manufactured by Teijin Techno Products Co., Ltd., trade name "Technora"). Among these fibers, polyparaphenylene terephthalamide (hereinafter sometimes referred to as PPTA) fibers are preferred due to their particularly excellent cut resistance.

[0052] The hollow fiber is not particularly limited as long as it is a hollow fiber or a fiber that can be hollowed. Examples of hollow fibers that can be hollowed include composite short fibers having a water-insoluble thermoplastic polymer as a sea component and a water-soluble thermoplastic polymer as an island component. Specific examples include composite fibers having a thermoplastic polymer with an equilibrium moisture regain of 2% or less as a sea component and a water-soluble thermoplastic polyvinyl alcohol polymer as an island component. Such composite fibers can be hollowed out to form hollow fibers by treating them with water to dissolve and remove the water-soluble thermoplastic polyvinyl alcohol polymer from the composite fibers.

[0053] 3. Fiber structures The above-mentioned yarns and blended yarns can be processed into fabrics such as woven fabrics and knitted fabrics, or sewn together to form fiber structures (textile products).

[0054] Examples of the materials include fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics; pile fabrics such as pile woven fabrics and pile knitted fabrics; clothing and other body wear products formed from these; interior goods; bedding; food packaging materials; etc. Specific examples include clothing and body wear products such as underwear, sweaters, jackets, pajamas, yukata, white coats, slacks, socks, gloves, stockings, aprons, masks, towels, handkerchiefs, supporters, headbands, hats, shoe insoles, and interlinings; various carpets, curtains, wallpaper, shoji paper, sliding doors, fiber blinds, artificial ornamental plants, fabrics for upholstering chairs, tablecloths, electrical appliance covers, tatami mats, futon fillings (batting, etc.), futon covers, sheets, blankets, futon covers, pillows, pillowcases, bed covers, bed fillings, mats, sanitary materials, toilet seat covers, wiping cloths, and filters for air purifiers, air conditioners, etc. [Example]

[0055] The present invention will now be described in detail with reference to examples, but the present invention is not limited to these examples. Ratios and percentages in the examples are by weight.

[0056] [Example 1] In this Example 1, we used combustion products (pyrolyzed products) obtained by thermally decomposing rice husks at temperatures below 500°C (300-500°C). Pyrolysis was carried out for several days. Although the vegetable silica A contained in this combustion product was amorphous, the silica content in the combustion product was relatively low at 86% by weight. On the other hand, the combustion product contained a relatively large amount of carbon (graphite). The burned plant material was then pulverized to obtain a fine powder of plant silica A (mixed with fine powder of carbon, etc.) with an average particle size of 1 μm. The pulverized material was gray in color.

[0057] This vegetable silica fine powder was mixed with ethylene glycol at room temperature to a predetermined concentration and thoroughly stirred. Terephthalic acid was then added, adjusting the molar ratio of ethylene glycol to terephthalic acid to 1.2, to produce a slurry. This slurry was continuously fed into an esterification tank for esterification, yielding an esterified product with an esterification rate of 98%. Sb2O3 was used as the polymerization catalyst. The resulting polymer was spun and drawn according to known methods to produce a multifilament yarn with an intrinsic viscosity [η] of 0.63 and 84 dtex (24 filaments). This multifilament yarn contained 3 wt% vegetable silica A fine powder and 3.5 wt parts of carbon fine powder per 100 wt parts of vegetable silica A fine powder.

[0058] Next, in order to evaluate the heat storage and heat retention properties, the multifilament yarn was used to make a spun yarn having a basis weight of 200 g / m 2 This knit was then heat-set at 180°C for 1 minute to produce Sample C. As shown in Figure 1, a thermocouple 15 was placed under Sample C, which was then placed on a sample stage (made of polystyrene foam) and fixed in place with a work holder (not shown). After irradiating the sample with artificial sunlight (lamp 12: Iwasaki Electric Co., Ltd., Eye Lamp <Spot> PRS100V500W), the sample temperature was measured after 15 minutes. The irradiation distance L was 50 cm, and the room temperature was 20±2°C.

[0059] The heat storage and heat retention properties were evaluated by measuring the temperature difference (ΔT°C) between a knitted garment made of polyester fiber (sample R in Figure 1) and sample C made from the fiber of each example, to see how high the temperature was, and evaluating it according to the following criteria. The positions of the samples (C and R in Figure 1) were swapped and the measurement was carried out twice, and the average value of the data was used as the test result. ◎: Temperature difference 7℃ or more ○: Temperature difference 5℃ or more △: Temperature difference between 1℃ and 5℃ ×: Temperature difference less than 1°C

[0060] The evaluation results are shown in Table 1. The knitted fabric of Example 1 was particularly excellent in heat storage and heat retention properties.

[0061] [Example 2] In this Example 2, we used combustion products obtained by burning rice husks at a temperature of approximately 1000°C. This vegetable silica B was obtained by burning rice husks at a high temperature, but it was amorphous because alkali metal impurities were removed from the rice husks before burning them, and the silica content in the combustion products was high at 99.2% by weight. Furthermore, because the combustion temperature was high, the carbon content in the combustion products was small. The burned plant material was then pulverized to obtain a fine powder of plant silica B (mixed with a small amount of fine powder of carbon, etc.) with an average particle size of 1 μm. The color of the pulverized material obtained was generally white.

[0062] Using this fine powder of vegetable silica B, etc., a multifilament yarn was obtained in the same manner as in Example 1. This multifilament yarn contained 3% by weight of the fine powder of vegetable silica B and 0.1 parts by weight of carbon fine powder per 100 parts by weight of the fine powder of vegetable silica B.

[0063] A knit was produced in the same manner as in Example 1, and the same tests and evaluations were carried out. The evaluation results are shown in Table 1. The knit of Example 2 had excellent heat storage properties, but was inferior to the knit of Example 1.

[0064] [Table 1]

[0065] From the above, Example 1, which has a higher carbon content, has improved heat storage capacity than Example 2. The detailed mechanism by which heat storage capacity is improved is unknown, but it is presumed that the far-infrared radiation characteristics of silica (quartz stone) tend to attenuate significantly in the wavelength range of 5 μm or less, and that the incorporation of carbon raises the level of this attenuation, resulting in flat infrared radiation characteristics overall.

[0066] Although the present invention has been described above with reference to specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art without departing from the scope of the claims attached to the application of this application.

[0067] For example, in the above-described embodiments and examples, carbon contained in the combustion product (pyrolysis product) of plant material was pulverized and incorporated into the fibers, but this is not limiting. For example, in the above-described Example 2, which has a low carbon content, commercially available carbon powder may be added. In this case, it is preferable to add the commercially available carbon powder so that the total amount of carbon powder is 0.5 to 13.0 parts by weight per 100 parts by weight of the amorphous silica powder. [Explanation of symbols]

[0068] 1. Heat storage and heat retention evaluation device 11 Sample stage 12 Lamp 15 Thermocouple C. Examples R control

Claims

1. A fiber containing a fine powder of vegetable silica, The fiber is a core-sheath type composite fiber consisting of a core and a sheath, Only the core contains fine powder of vegetable silica. fiber.

2. The vegetable silica is amorphous silica. The fiber of claim 1.

3. Plant silica fine powder is The average particle size is 0.1 to 10 μm. The fiber according to claim 1 or claim 2.

4. Contains 0.5 to 15% by weight of vegetable silica fine powder. The fiber according to any one of claims 1 to 3.

5. Contains fine powder of carbon, The fiber according to any one of claims 1 to 4.

6. The carbon fine powder is contained in an amount of 0.5 to 13.0 parts by weight per 100 parts by weight of the vegetable silica fine powder. The fiber according to any one of claims 1 to 5.

7. A fiber containing fine powder of amorphous silica and fine powder of carbon, Contains 0.5 to 15% by weight of amorphous silica fine powder, The fine powder of carbon is contained in an amount of 0.5 to 13.0 parts by weight per 100 parts by weight of the fine powder of amorphous silica, The fiber is a core-sheath type composite fiber consisting of a core and a sheath, Only the core contains fine powder of vegetable silica. fiber.

8. A yarn using the fiber according to any one of claims 1 to 7.

9. A fiber structure at least partly using the yarn according to claim 8.

10. Short fibers of the fiber according to any one of claims 1 to 7; and short fibers of fibers that do not contain vegetable silica fine powder. Blended yarn.

11. Short fibers that do not contain vegetable silica fine powder It is a short fiber of a fiber having a deodorizing function, The blended yarn of claim 10.

12. 10 to 30% by weight of short fibers of the fiber according to any one of claims 1 to 7; The fiber contains 10 to 90% by weight of short fibers that do not contain vegetable silica fine powder. Blended yarn.

13. A fiber structure at least partly using the blended yarn according to any one of claims 10 to 12.

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