Rayon fibers containing Mount Fuji lava, blended yarns, textile products, and methods for manufacturing rayon fibers.

Abstract

By incorporating lava microparticles with protrusions within the gaps of rayon fibers, this method achieves "suppression of lava microparticle detachment" from the rayon fibers. [Solution] In the rayon fiber 1, lava particles 2 with convex portions 2a are present in the gaps 1a. The lava particles 2 may have a silicon oxide content of 48% to 53%, such as Mount Fuji lava, or the charcoal and zinc oxide particles present in the gaps 1a may also have convex portions. In the blended yarn 10 of the rayon fiber 1 and the non-rayon fiber 11, the difference in length ΔD between the rayon fiber 1 and the non-rayon fiber 11 may be 0 mm to 20 mm. The rayon fiber 1 may also be used in the textile product 50. Furthermore, in the manufacturing method of the rayon fiber 1, lava particles 2 are present in the gaps 1a of the rayon fiber 1 during the spinning process P3, and the lava particles 2 are converted into particles with convex portions 2a during the dry and wet grinding processes P1 and P2. In the wet grinding process P2, etc., non-lava material may also be used to grind the lava particles 2.

Description

[Technical Field]

[0001] This invention relates to rayon fibers containing lava particles, blended yarns in which rayon fibers are spun, textile products using rayon fibers, and methods for manufacturing rayon fibers. [Background technology]

[0002] Conventionally, chemical fibers containing volcanic ash have been known (Patent Document 1). This chemical fiber, etc., is a physical and chemical material containing volcanic ash from an active volcano, wherein the volcanic ash was ejected from an active volcano and is within 100 years of the time of ejection, and the physical and chemical material is a chemical fiber, foam, or structure containing the volcanic ash from the active volcano. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-099947 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0004] In this Patent Document 1, paragraph 0059, etc., it is mentioned that, in order to impart fine particles of volcanic ash to chemical fibers, fine particles of volcanic ash are added to the polymer raw material of the chemical fiber (an aromatic isocyanate compound having a urethane bond), and after spinning, the fiber fabric is knitted. However, in practice, even when fine particles such as volcanic ash are added to synthetic fibers, these particles fall off during processes such as knitting, resulting in problems such as insufficient performance (e.g., heat generation and heat retention) and increased costs.

[0005] In view of these points, the present invention aims to provide rayon fibers, blended yarns, textile products, and a method for manufacturing rayon fibers that can achieve "suppression of detachment of lava particles" from rayon fibers by having lava particles with protrusions formed in the gaps between rayon fibers. [Means for solving the problem]

[0006] The rayon fiber 1 according to the present invention is a rayon fiber containing lava fine particles 2, wherein the rayon fiber has gaps 1a formed therein, the lava fine particles 2 are present inside the gaps 1a, and the lava fine particles 2 have a shape in which protrusions are formed.

[0007] A second feature of the rayon fiber 1 according to the present invention is that, in addition to the first feature described above, the lava fine particles 2 have a silicon dioxide content of 48.0% or more and 53.0% or less.

[0008] A third feature of the rayon fiber 1 according to the present invention is that, in addition to the first feature described above, the rayon fiber also contains fine particles of carbon and / or zinc oxide, the fine particles of carbon and / or zinc oxide are also present inside the gap 1a, and the fine particles of carbon and / or zinc oxide also have a shape in which convex portions are formed.

[0009] The first characteristic of the blended yarn 10 according to the present invention is that the above-mentioned rayon fiber 1 is blended with a non-rayon fiber 11 which is a fiber other than the rayon fiber 1, and the rayon fiber 1 and the non-rayon fiber 11 are short fibers, and the difference ΔD between the length of the rayon fiber 1 and the length of the non-rayon fiber 11 is 0 mm or more and 20 mm or less.

[0010] The first characteristic of the textile product 50 according to the present invention is that it uses the rayon fiber 1 described above.

[0011] The first characteristic of the method for producing rayon fibers 1 according to the present invention is that the method for producing rayon fibers 1 containing lava fine particles 2 comprises: a dry grinding step P1 in which the lava fine particles 2 are ground by dry grinding; a wet grinding step P2 in which the lava fine particles 2 ground in the dry grinding step P1 are ground by wet grinding; and a spinning step P3 in which a raw solution obtained by mixing the lava fine particles 2 ground in the wet grinding step P2 with a solution in which cellulose fiber is dissolved is spun into the rayon fibers 1 in which gaps 1a are formed. In the spinning step P3, the lava fine particles 2 are present inside the gaps 1a of the rayon fibers 1, and in the dry grinding step P1 and the wet grinding step P2, the lava fine particles 2 have a shape in which protrusions are formed.

[0012] A second feature of the method for producing the rayon fiber 1 according to the present invention is that, in addition to the first feature described above, in the dry grinding step P1 and / or wet grinding step P2, a non-lava material, which is different from the lava fine particles 2, is also used to grind the lava fine particles (2).

[0013] Due to these features, the lava particles 2 present in the gaps 1a of the rayon fiber 1 have a shape in which a protrusion 2a is formed. Unlike Patent Document 1, the lava particles 2 are more likely to get caught in the gaps 1a because they have this shape. Therefore, even in processes such as knitting and weaving, the shedding of lava particles 2 from the rayon fiber 1 can be suppressed ("suppression of lava particle shedding"), and the heat generation and heat retention properties of the rayon fiber 1 itself and the textile product 50 using the rayon fiber 1 can be improved ("improvement of heat generation and heat retention properties"), and "cost reduction" can also be achieved. Furthermore, since lava particles 2 are present within the gaps 1a of the rayon fiber 1, it can also be called a "rayon fiber containing lava (lava rayon fiber)."

[0014] Furthermore, by making the lava particles 2 have a silicon dioxide content of 48.0% to 53.0%, further "exhibition of heat generation and heat retention properties" can be achieved. Furthermore, the lava particles 2, which have a silicon dioxide content of 48.0% to 53.0%, include lava particles erupted from Mt. Fuji. In other words, the rayon fibers 1 can be described as "rayon fibers containing Mt. Fuji lava (Mt. Fuji lava rayon fibers)" in which Mt. Fuji lava particles 2 exist within the gaps 1a. Furthermore, by including fine particles of charcoal and zinc oxide with a convex shape within the gaps 1a of the rayon fiber 1, the deodorizing, antibacterial, and antiviral properties of the rayon fiber 1 can also be improved.

[0015] Furthermore, in a blended yarn 10 of rayon fibers 1 and non-rayon fibers 11, which are both short fibers, by setting the length difference ΔD between rayon fibers 1 and non-rayon fibers 11 to 0 mm or more and 20 mm or less, the state of the blended yarn in the blended yarn 10 becomes easier to maintain. Furthermore, since the blended yarn 10 also contains rayon fibers 1 in which lava particles 2 are present within the gaps 1a, it can also be described as "a blended yarn of rayon fibers containing lava (lava rayon fibers)." The rayon fiber 1 described above may also be used in textile product 50, and such textile product 50 can also be called a "textile product of rayon fiber containing lava (lava rayon fiber)".

[0016] In addition, in the method for manufacturing rayon fibers 1, lava particles 2 are placed in the gaps 1a of the rayon fibers 1 during the spinning process P3, and the lava particles 2 are transformed into particles with a shape in which protrusions 2a are formed during the dry grinding process P1 and the wet grinding process P2 (the lava particles 2 are given a shape in which protrusions 2a are formed during the dry grinding process P1 and the wet grinding process P2). Unlike Patent Document 1, the lava particles 2 are more likely to get caught in the gaps 1a due to the presence of particles with this shape, thus suppressing the shedding of lava particles during processes such as knitting and weaving. This makes it possible to improve the heat generation and heat retention of the rayon fibers 1 themselves and the textile products 50 using the rayon fibers 1, and also reduces costs. The manufacturing method of the rayon fiber 1 can also be referred to as "a method for manufacturing rayon fiber containing lava (lava rayon fiber)" because it manufactures the rayon fiber 1 in which the lava fine particles 2 exist in the gap 1a. In addition, in the dry pulverization step P1 and the wet pulverization step P2 in the manufacturing method of the rayon fiber 1, by pulverizing the lava fine particles 2 using a non-molten body, convex portions 2a are likely to be formed in the lava fine particles 2, and further "suppression of the dropout of the lava fine particles" and the like can be achieved.

Effects of the Invention

[0017] According to the rayon fiber, the blended yarn, the fiber product, and the manufacturing method of the rayon fiber according to the present invention, by making the lava fine particles in which convex portions are formed exist in the gaps of the rayon fiber, "suppression of the dropout of the lava fine particles" and the like from the rayon fiber can be realized.

Brief Description of the Drawings

[0018] [Figure 1] It is an enlarged schematic view showing the rayon fiber according to the present invention. [Figure 2] It is a drawing substitute photograph exemplifying the lava fine particles (lava fine particles of Mount Fuji) contained in the rayon fiber, where (a) shows the fine particles after pulverization (particularly, after dry pulverization), and (b) shows the lava before pulverization. [Figure 3] It is an enlarged schematic view showing the blended yarn according to the present invention (particularly, the difference in the length of each fiber, etc.). [Figure 4] It is a drawing substitute photograph showing the blended yarn according to the present invention, where (a) shows the rayon fiber curled before blending, and (b) shows the blended yarn of the rayon fiber and the non-rayon fiber (cotton fiber). [Figure 5] It is a drawing substitute photograph by an optical microscope showing the blended yarn of the rayon fiber containing fine particles and the non-rayon fiber (cotton fiber). The fine particles shown in FIG. 5 are tourmaline fine particles. [Figure 6]These are photographic representations illustrating the textile products according to the present invention, where (a) illustrates a belly band, (b) illustrates the innerwear (front), (c) illustrates the innerwear (back), and (d) illustrates the innerwear (such as the napped portion on the skin side). [Figure 7] A flowchart illustrating a method for producing rayon fibers according to the present invention, where (a) shows a first embodiment and (b) shows a second embodiment. [Modes for carrying out the invention]

[0019] <Rayon fiber 1> Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 6 show the rayon fiber 1 according to the present invention, which contains lava particles 2 (described later) and has gaps 1a (described later). Note that rayon fiber 1 refers to the individual fibers. The rayon fiber 1 may contain lava particles 2, which are lava particles erupted from Mount Fuji as described later, and may also contain charcoal particles 3 and zinc oxide particles 4 as described later. Furthermore, the rayon fiber 1 may be blended into the blended yarn 10 described later, used in the textile product 50 described later, or used in yarn (so to speak, rayon yarn).

[0020] Rayon fiber 1 may be short fiber (also called staple) or long fiber (filament). The fineness (single fiber fineness) of the rayon fiber 1 is not particularly limited, but for example, it may be 0.1 dtex or more and 20.0 dtex or less. More specifically, the lower limit may be 0.1 dtex or more, preferably 0.5 dtex or more, and even more preferably 1.0 dtex or more, and the upper limit may be 20.0 dtex or less, preferably 10.0 dtex or less, and even more preferably 5.0 dtex or less. Note that each of these lower limits of single fiber fineness may be combined with any of the upper limits.

[0021] The length of the rayon fiber 1 in the case of short fibers is not particularly limited, but for example, it may be between 1 mm and 500 mm. More specifically, the lower limit may be 1 mm or more, preferably 10 mm or more, and even more preferably 30 mm or more, and the upper limit may be 500 mm or less, preferably 200 mm or less, and even more preferably 100 mm or less. Furthermore, each of these lower limits of length may be combined with any of the upper limits. The cross-sectional shape of the rayon fiber 1 described above is not particularly limited, but for example, <1> It may be roughly petal-shaped (a shape in which multiple folds are formed on the lateral surface, and the number of petals may be, for example, four or more), <2> It may be roughly tubular (it may also be roughly circular, with the inside of the central part being hollow), <3> This could be a shape in which at least a part of the ribbon (the linear part in cross-section) is rolled up (hereinafter referred to as "rolled ribbon shape"), <4> It is roughly circular in shape, <5> It may be roughly Y-shaped or have other shapes. Furthermore, the cross-sectional shape of the rayon fiber 1 is <1> ~ <3> When the shape is roughly petal-like, roughly tubular, or coiled ribbon-like, it is also acceptable for their shape to be flattened. <1> The petal-like shape, <4> A roughly circular shape, <5> It is roughly Y-shaped, and hollow (so to speak, <2> It is also acceptable if it is a circular abbreviation.

[0022] Furthermore, regarding the thickness of rayon fiber 1, its single fiber fineness and specific gravity (for example, 1.5 g / cm³) 3 Considering the above, the cross-sectional shape is <4> Assuming it is roughly circular in shape, for example, the thickness may be between approximately 2.9 μm and approximately 41.2 μm. More specifically, the lower limit may be approximately 2.9 μm (≒0.1 dtex) or more, preferably approximately 6.5 μm (≒0.5 dtex) or more, and even more preferably approximately 9.2 μm (≒1.0 dtex) or more, while the upper limit may be approximately 41.2 μm (≒20.0 dtex) or less, preferably approximately 29.1 μm (≒10.0 dtex) or less, and even more preferably approximately 20.6 μm (≒5.0 dtex) or less. Furthermore, each of these lower limits of thickness may be combined with any of the upper limits. The cross-sectional shape of the rayon fiber 1 described above can be said to be related to the gap 1a, which will be discussed later.

[0023] <Gap 1a> As shown in Figures 1, 3, and 5, the gap 1a is formed in (or provided in) the rayon fiber 1 described above, and the lava particles 2 described later are present inside it. In addition, fine particles of carbon 3 and zinc oxide 4 described later, and other fine particles may also be present inside it, and it can be said that fine particles such as the lava particles 2 are contained within the gap 1a. Such gaps 1a may be provided on the circumferential surface (so to speak, the outside) of the rayon fiber 1, and / or inside the rayon fiber 1, and these gaps 1a can also be said to be provided (formed) in the spinning process P3 described later. More specifically, the cross-sectional shape of rayon fiber 1 is, <1> In the case of a roughly petal-like shape, it can be said that multiple folds are formed on the circumferential surface of the rayon fiber 1, substantially along the length direction of the rayon fiber 1, and gaps 1a exist between these multiple folds. Alternatively, even in the case of a roughly petal-like shape, gaps 1a may exist inside the rayon fiber 1. <2> If it is roughly tubular, it can be said that a gap 1a exists inside the rayon fiber 1. <3> Even in the case of a rolled ribbon, it can be said that a gap 1a exists inside the rolled portion. <4> Even when the shape is roughly circular, it can be said that a gap 1a exists inside the rayon fiber 1. <5> If the shape is roughly Y-shaped, it can be said that at least a gap 1a exists inside the rayon fiber 1.

[0024] Here in particular, <1> In the case of a roughly petal-like shape, the gap 1a can be described as a groove formed on the circumferential surface of the rayon fiber 1, and this groove-shaped gap 1a may be along the length direction of the rayon fiber 1, or it may have meandering or oblique portions (portions that form a predetermined angle between the length direction and the groove-shaped gap 1a) relative to its length direction. also, <5> Even when the shape is roughly Y-shaped, it can be said that a total of three folds are formed on the side surface of the rayon fiber 1. However, of these three folds, the space between two adjacent folds is too wide, making it difficult for the lava particles 2, described later, to be trapped and retained. <5> In this case, it can be said that a gap 1a exists inside the rayon fiber 1. <5> In the case of the three pleats on the side surface of the rayon fiber 1, if each pleat is thick (wide), and the space between two adjacent pleats is sufficiently narrow, <5> Even when it is roughly Y-shaped, it can be said that a groove-shaped gap 1a is formed on the side surface of the rayon fiber 1, and this groove-shaped gap 1a is also <1> As in the case above, the rayon fiber 1 may have portions that run along its length, or portions that meander or are oblique to its length. There are no particular limitations on the size (also called depth or width) of such gaps 1a, but for example, the cross-sectional shape of the rayon fiber 1 is <1> They are almost petal-like, <5> In the case where the rayon fiber 1 is roughly Y-shaped and has groove-shaped gaps 1a on its side surface, the depth of the groove-shaped gaps 1a may be 0.1 μm or more and 6.0 μm or less. More specifically, the lower limit may be 0.1 μm or more, preferably 0.5 μm or more, and even more preferably 1.0 μm or more, and the upper limit may be 6.0 μm or less, preferably 4.0 μm or less, and even more preferably 2.0 μm or less. Furthermore, the width of the groove-shaped gap 1a is the length between two adjacent folds, and these folds do not necessarily have to be elastically curved or not; for example, it may be between 0.0 μm and 6.0 μm, and to elaborate further, the lower limit may be 0.0 μm or more, preferably 0.1 μm or more, and even more preferably 0.5 μm or more, and the upper limit may be 6.0 μm or less, preferably 4.0 μm or less, and even more preferably 2.0 μm or less. Note that these lower limits for depth and width may be combined with any of the upper limits.

[0025] next, <2> If the rayon fiber is roughly tubular, the gap 1a can be described as a roughly columnar cavity located around the approximate center of the rayon fiber 1 and extending roughly along the length of the rayon fiber 1. If the cross-sectional shape of the rayon fiber 1 is roughly tubular, this roughly columnar cavity 1a will be a roughly cylindrical cavity, and if the cross-sectional shape of the rayon fiber 1 is roughly rectangular tubular, it will be a roughly rectangular prism cavity. There are no particular limitations on the size of such gaps 1a, but for example, the cross-sectional shape of the rayon fiber 1 is <2> If the structure is roughly tubular and the gap 1a is a roughly cylindrical cavity, the diameter of the roughly cylindrical cavity gap 1a may be 1 μm or more and 40 μm or less. More specifically, the lower limit may be 1 μm or more, preferably 4 μm or more, and even more preferably 7 μm or more, and the upper limit may be 40 μm or less, preferably 28 μm or less, and even more preferably 19 μm or less. Furthermore, each of the lower limits of the cavity diameter may be combined with any of the upper limits.

[0026] others, <1> ~ <5> In this case, if the gap 1a is located inside the rayon fiber 1, the structure of the gap 1a is not particularly limited, but may be, for example, a cavity formed inside the rayon fiber 1 in the spinning process P3 described later, or a crack-like structure. In particular, the opening of a crack-like gap 1a may be exposed on the side surface of the rayon fiber 1. There are no particular limitations on the size of such gaps 1a, but for example, <1> ~ <5> If the gap 1a in the rayon fiber 1 is located inside the rayon fiber 1 and is in the form of a cavity or crack, then the cross-sectional shape of the cavity or crack-like gap 1a is naturally smaller than the cross-sectional shape of the rayon fiber 1. Lava particles 2, which will be described later, are present inside this gap 1a.

[0027] <Lava particles 2, protrusion 2a> As shown in Figures 1-6, the lava particles 2 are fine particles present inside the gaps 1a of the rayon fibers 1 described above, and are fine particles of lava ejected from a volcano. The lava particles 2 have (contain) fine particles (lava particles) that have a shape formed by the convex portion 2a described later. Here, the "protrusions 2a" in the lava particles 2 may be, for example, corners of a roughly tetrahedron (roughly triangular pyramidal), roughly cubic, roughly rectangular, or roughly polyhedron-like shape, or protruding parts (projections) in an irregular shape (fragmented), or protruding parts of a roughly flat plate (where the plan view shape is roughly triangular, roughly square, roughly pentagonal, roughly hexagonal, or other roughly polygonal shape, not circular), or the ends in the longitudinal direction of a roughly needle-like (or roughly rod-like or roughly fibrous) shape, or the ends in the longitudinal direction of a roughly ellipsoid-like shape. It can also be said that if it is a perfect sphere, there are no protrusions 2a. Therefore, the "shape having a protrusion 2a" with respect to the lava particles 2 may be, for example, a roughly tetrahedron (roughly triangular pyramidal), roughly cuboid, roughly rectangular, roughly polyhedron, or an irregular shape (fragmented) with one or more protruding parts. In addition, it may be roughly plate-like, roughly needle-like (roughly rod-like or roughly fibrous), or roughly ellipsoidal. In other words, it can be said to be a shape that is not perfectly spherical.

[0028] Such lava particles 2 may be present in only one rayon fiber 1, or in multiples. In the following description, it will be assumed that multiple lava particles 2 are present in each rayon fiber 1. Furthermore, there are no particular limitations on the amount (content, mass%) of lava particles 2 contained in one rayon fiber 1. For example, it may be 0.1% by mass or more and 20.0% by mass or less. More specifically, the lower limit may be 0.1% or more, preferably 0.5% or more, and even more preferably 1.0% or more, and the upper limit may be 20.0% or less, preferably 10.0% or less, and even more preferably 5.0% or less. Note that each of these lower limits of content may be combined with any of the upper limits.

[0029] There are no particular limitations on the size of the lava particles 2, but they may be expressed as, for example, the maximum particle size (the particle size of the largest lava particle 2 among multiple lava particles 2) measured with the Microtrac-Bell "Particle Size Distribution Analyzer MT3000II" manufactured by Microtrac-Bell Corporation, or as the average particle size. Regarding the maximum particle size of the lava particles 2, for example, it may be between 0.5 μm and 6.0 μm. More specifically, the lower limit may be 0.5 μm or more, preferably 1.0 μm or more, and even more preferably 1.5 μm or more, while the upper limit may be 6.0 μm or less, preferably 4.0 μm or less, and even more preferably 2.0 μm or less (e.g., 1.635 μm). Furthermore, each of these lower limits for the maximum particle size may be combined with any of the upper limits. Furthermore, regarding the average particle size of the lava particles 2, for example, it may be between 0.01 μm and 2.00 μm. More specifically, the lower limit may be 0.01 μm or more, preferably 0.05 μm or more, and even more preferably 0.10 μm or more, while the upper limit may be 2.00 μm or less, preferably 1.00 μm or less, and even more preferably 0.50 μm or less (e.g., 0.347 μm). Note that each of these lower limits for average particle size may be combined with any of the upper limits.

[0030] <Silicon dioxide content, etc.> The lava particles 2 described above contain silicon dioxide (SiO2), and there are no particular limitations on the content, but for example, it may be 48.0% or more and 53.0% or less. More specifically, the lower limit may be 48.0% or more, preferably 48.3% or more, and even more preferably 48.7% or more, and the upper limit may be 53.0% or less, preferably 52.5% or less, and even more preferably 51.9% or less. Furthermore, each of these lower limits of content may be combined with any of the upper limits. Furthermore, the silicon dioxide content of the lava fine particles 2 may be, for example, 45% or more and 77% or less. More specifically, the lower limit may be 45% or more, preferably 46% or more, and even more preferably 48% or more, while the upper limit may be 77% or less, preferably 70% or less, even more preferably 63% or less, and even more preferably 52% or less. Note that each of these lower limits of content may be combined with any of the upper limits. Here, in rocks, if the silicon dioxide content is between 45% and 52%, it can be called basalt; if it is greater than 52% and 63% or less, it can be called andesite; if it is greater than 63% and 70% or less, it can be called dacite; and if it is greater than 70% and 77% or less, it can be called rhyolite.

[0031] Furthermore, lava particles 2 may be lava particles erupted from Mt. Fuji (Mt. Fuji lava particles), and as mentioned above, in this case, the silicon dioxide content can be said to be between 48.0% and 53.0%. Furthermore, if the lava particles 2 are Mt. Fuji lava particles, the content of magnesium oxide (MgO), potassium oxide (K2O), and the ratio of iron oxide (FeO, Fe2O3, Fe3O4) to magnesium oxide may be set to predetermined values. First, there are no particular limitations on the magnesium oxide content, but for example, it may be 3.0% or more and 8.0% or less. More specifically, the lower limit may be 3.0% or more, preferably 4.0% or more, and even more preferably 4.2% or more, and the upper limit may be 8.0% or less, preferably 7.0% or less, and even more preferably 6.5% or less. Note that each of these lower limits of content may be combined with any of the upper limits. Next, there are no particular limitations on the potassium oxide content, but for example, it may be between 0.10% and 1.50%, and more specifically, the lower limit may be 0.10% or more, preferably 0.30% or more, and even more preferably 0.47% or more, and the upper limit may be 1.50% or less, preferably 1.20% or less, and even more preferably 1.00% or less. Furthermore, each of these lower limits of content may be combined with any of the upper limits. Furthermore, there are no particular limitations on the iron oxide / magnesium oxide ratio, but for example, it may be between 0.5 and 5.0. More specifically, the lower limit may be 0.5 or higher, preferably 1.0 or higher, and even more preferably 1.7 or higher, while the upper limit may be 5.0 or lower, preferably 4.0 or lower, and even more preferably 2.8 or lower. Note that each of these lower limits of the ratio may be combined with any of the upper limits.

[0032] Furthermore, regardless of whether the lava particles 2 are Mount Fuji lava particles or not, the lava particles 2 may contain iron oxide, and there are no particular limitations on the iron oxide content, but for example, it may be 1.5% or more and 40.0% or less, and more specifically, the lower limit may be 1.5% or more, preferably 2.0% or more, and even more preferably 2.1% or more, and the upper limit may be 40.0% or less, preferably 30.0% or less, and even more preferably 20.0% or less. Note that each of these lower limits of content may be combined with any of the upper limits. Furthermore, regardless of whether or not lava particles 2 are lava particles from Mt. Fuji, lava particles 2 may contain magnesium oxide and potassium oxide, and the content ratio may be the same as that described above.

[0033] <3 fine particles of charcoal, 4 fine particles of zinc oxide> As shown in Figure 1, the charcoal particles 3 (hereinafter referred to as "charcoal particles 3") are fine particles that exist inside the gaps 1a of the rayon fibers 1 described above. The type of charcoal is not particularly limited, but may be wood charcoal (charcoal made from wood) such as Binchotan charcoal (white charcoal), black charcoal, sawdust charcoal, or powdered charcoal, or bamboo charcoal (charcoal made from bamboo), coal, or other materials such as carbon black, graphite, or limestone. The carbon nanoparticles 3 have (include) nanoparticles (carbon nanoparticles) that have a shape in which the convex portion 3a described later is formed. Here, the "protrusions 3a" in the carbon nanoparticles 3 may be, for example, corners of a roughly tetrahedron, roughly cubic, roughly rectangular, or roughly polyhedron-like shape, or protruding parts of an irregular shape. In addition, they may be protruding parts of a roughly flat plate, the ends in the longitudinal direction of a roughly needle-like shape, or the ends in the longitudinal direction of an roughly ellipsoidal shape. Furthermore, if the carbon nanoparticles 3 are perfectly spherical, it can be said that there are no protrusions 3a. Therefore, the "shape having a protrusion 3a" of the carbon nanoparticles 3 may be, for example, a roughly tetrahedron, a roughly cuboid, a roughly rectangular parallelepiped, or a roughly polyhedron, or an irregular shape having one or more protruding parts, or it may be a roughly flat plate, a roughly needle-shaped, or a roughly ellipsoidal shape, in other words it can be said to be a shape that is not a perfect sphere.

[0034] These carbon particles 3 may be present as one per rayon fiber 1, or multiple particles may be present. In the following discussion, we will assume that multiple carbon particles 3 are present in each rayon fiber 1. Furthermore, the amount of carbon microparticles 3 contained in one rayon fiber 1 may be the same as the amount of lava microparticles 2 mentioned above. Furthermore, there are no particular limitations on the size of the carbon particles 3, but they may be expressed as, for example, the maximum particle size or average particle size measured with the "Particle Size Distribution Analyzer MT3000II" manufactured by Microtrac-Bell Co., Ltd., and the lower and upper limits of these maximum and average particle sizes may be the same as those of the maximum and average particle sizes of the lava particles 2 mentioned above.

[0035] As shown in Figure 1, the zinc oxide (ZnO) fine particles 4 (hereinafter referred to as "zinc oxide fine particles 4") are fine particles that exist inside the gaps 1a of the rayon fibers 1 described above. The zinc oxide nanoparticles 4 have (include) nanoparticles (zinc oxide nanoparticles) that have a shape in which the convex portion 4a described later is formed. Here, the "protrusions 4a" in the zinc oxide nanoparticles 4 may be, for example, corners of a roughly tetrahedron, roughly cubic, roughly rectangular, or roughly polyhedron-like shape, or protruding parts of an irregular shape. In addition, they may be protruding parts of a roughly flat plate, the ends in the longitudinal direction of a roughly needle-like shape, or the ends in the longitudinal direction of a roughly ellipsoidal shape. Furthermore, if the zinc oxide nanoparticles 4 are perfectly spherical, it can be said that there are no protrusions 4a. Therefore, the "shape having a protrusion 4a" of the zinc oxide nanoparticles 4 may be, for example, a roughly tetrahedron, a roughly cuboid, a roughly rectangular parallelepiped, or a roughly polyhedron, or an irregular shape having one or more protruding parts, or it may be a roughly flat plate, a roughly needle-shaped, or a roughly ellipsoidal shape, in other words it can be a shape that is not a perfect sphere. These zinc oxide particles 4 may be present as one per rayon fiber 1, or multiple particles may be present. In the following discussion, we will assume that multiple zinc oxide particles 4 are present in each rayon fiber 1. Furthermore, the amount of zinc oxide microparticles 4 contained in one rayon fiber 1 may be the same as the amount of lava microparticles 2 mentioned above. Furthermore, there are no particular limitations on the size of the zinc oxide nanoparticles 4. For example, they may be expressed as the maximum particle size or average particle size measured using the "Particle Size Distribution Analyzer MT3000II" manufactured by Microtrac-Bell Co., Ltd. The lower and upper limits of these maximum and average particle sizes may be the same as those for the lava nanoparticles 2 and carbon nanoparticles 3 mentioned above.

[0036] <Blended yarn 10> As shown in Figures 3-6, the blended yarn 10 is a yarn in which the rayon fibers 1 described above are blended with non-rayon fibers 11, which will be described later. In this blended yarn 10, both the rayon fibers 1 and the non-rayon fibers 11 are short fibers, and the blended yarn 10 can be said to be a spun yarn (staple yarn, spun yarn). These short fibers of rayon fiber 1 and short fibers of non-rayon fiber 11 are spun together (i.e., blended) to form a single yarn (spun yarn). The total fineness of the blended yarn 10 (as a single yarn) is not particularly limited, but may be, for example, 1 dtex or more and 200 dtex or less. More specifically, the lower limit may be 1 dtex or more, preferably 5 dtex or more, and even more preferably 10 dtex or more, and the upper limit may be 200 dtex or less, preferably 100 dtex or less, and even more preferably 50 dtex or less. Furthermore, each of these lower limits of total fineness may be combined with any of the upper limits.

[0037] The proportion of rayon fibers in one blended yarn 10 is not particularly limited, but may be, for example, 1% or more and 99% or less. More specifically, the lower limit may be 1% or more, preferably 10% or more, and more preferably 20% or more, and the upper limit may be 99% or less, preferably 90% or less, and more preferably 80% or less (such as 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc.). Furthermore, each of these lower limits may be combined with any of the upper limits. On the other hand, the proportion of non-rayon fibers 11 in a single blended yarn 10 is not particularly limited, but may be, for example, 1% or more and 99% or less. More specifically, the lower limit may be 1% or more, preferably 10% or more, and even more preferably 20% or more, and the upper limit may be 99% or less, preferably 90% or less, and even more preferably 80% or less (such as 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc.). Furthermore, each of these lower limits may be combined with any of the upper limits. Furthermore, it can be said that in one blended yarn 10, the sum of the proportion of rayon fibers (1) and non-rayon fibers (11) equals 100%.

[0038] <Non-rayon fiber 11> As shown in Figures 3-6, the non-rayon fibers 11 are fibers other than the rayon fibers 1 described above. Furthermore, in this invention, "fibers other than rayon fiber 1" means fibers composed of materials other than rayon. The fibers of materials other than rayon are not particularly limited, but for example, they may be cotton fibers, acrylic fibers (acrylic fibers mainly composed of polyacrylonitrile (PAN)), polyester fibers having ester bonds such as polyethylene terephthalate (PET) fibers, polytrimethylene terephthalate (PTT) fibers, and polybutylene terephthalate (PBT) fibers, polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers, nylon (polyamide) fibers, polyvinyl alcohol (PVA) fibers (vinylon fibers), polyurethane (PU) fibers, and acetate fibers. They may also be cupro fibers, glass fibers, wool, etc., and these may be used individually or in combination.

[0039] In a single blended yarn 10, the non-rayon fibers 11 may consist of one type of material, or they may consist of two or more types of materials (that is, if rayon fibers 1 are included, the blended yarn 10 may consist of three or more types of materials). In other words, the blended yarn 10 may be a blend of two types of fibers, rayon and cotton (more specifically, a blend of short rayon fibers and short cotton fibers), or a blend of two types of fibers, rayon and acrylic (more specifically, a blend of short rayon fibers and short acrylic fibers), or a blend of three types of fibers, rayon, cotton and polyester (more specifically, a blend of short rayon fibers, short cotton fibers and short polyester fibers), or a blend of four types of fibers, rayon, cotton, polyester and polyurethane (more specifically, a blend of short rayon fibers, short cotton fibers, short polyester fibers and short polyurethane fibers), and so on. When the non-rayon fiber 11 is composed of two or more materials, there are no particular limitations on the proportion of each material in the non-rayon fiber 11. Furthermore, it can be said that the sum of the proportions of each material in the non-rayon fiber 11 equals the proportion of the non-rayon fiber 11.

[0040] The fineness (single fiber fineness) of the non-rayon fiber 11 is not particularly limited, but for example, it may be between 0.1 dtex and 20.0 dtex. More specifically, the lower limit may be 0.1 dtex or more, preferably 0.5 dtex or more, and even more preferably 1.0 dtex or more, or the upper limit may be 20.0 dtex or less, preferably 10.0 dtex or less, and even more preferably 5.0 dtex or less. Furthermore, each of these lower limits of single fiber fineness may be combined with any of the upper limits. In one blended yarn 10, the single fiber fineness (value) of the rayon fiber 1 and the single fiber fineness (value) of the non-rayon fiber 11 may be approximately the same, or they may be different (the single fiber fineness of the rayon fiber 1 may be greater or less than that of the non-rayon fiber 11). There are no particular limitations on the value of this difference in single fiber fineness, but for example, it may be between 0.1 dtex and 10.0 dtex. More specifically, the lower limit may be 0.1 dtex or more, preferably 0.5 dtex or more, and even more preferably 1.0 dtex or more, while the upper limit may be 10.0 dtex or less, preferably 5.0 dtex or less, and even more preferably 2.0 dtex or less. Furthermore, each of these lower limits of single fiber fineness may be combined with any of the upper limits.

[0041] Furthermore, in this invention, "the single fiber fineness of the rayon fiber 1 and the single fiber fineness of the non-rayon fiber 11 are approximately the same" may also mean that the difference between the single fiber fineness of the rayon fiber 1 and the single fiber fineness of the non-rayon fiber 11 is 0.0 dtex or more and 1.0 dtex or less. The cross-sectional shape of such non-rayon fibers 11 is not particularly limited, but for example, it may be roughly circular, roughly elliptical, roughly Y-shaped, or otherwise roughly petal-shaped, roughly tubular, or coiled ribbon-shaped, or if it is roughly petal-shaped, roughly tubular, or coiled ribbon-shaped, then these shapes may be flattened (see Figure 3, etc.). In a single blended yarn 10, the cross-sectional shape of the rayon fiber 1 and the cross-sectional shape of the non-rayon fiber 11 may be approximately the same or may be different. Furthermore, as shown in Figure 5, the cotton fibers, which are non-rayon fibers 11 in the blended yarn 10, can be said to be free of fine particles, and also to be twisted.

[0042] <Difference in length ΔD, etc.> As shown in Figure 3, the difference in length between the non-rayon fiber 11 and the rayon fiber 1 (the difference between the length of the non-rayon fiber 11 and the length of the rayon fiber 1) ΔD described above is not particularly limited in one blended yarn 10, but may be, for example, 0 mm or more and 20 mm or less (0.0 mm or more and 20.0 mm or less). More specifically, the lower limit may be 0.0 mm or more, preferably 0.5 mm or more, and even more preferably 1.0 mm or more, and the upper limit may be 20.0 mm or less, preferably 15.0 mm or less, and even more preferably 10.0 mm or less. Furthermore, each lower limit of this length difference ΔD may be combined with any of the upper limits. Here, regarding the length of the non-rayon fibers 11 and the rayon fibers 1, there are no particular limitations on the length of the non-rayon fibers 11 and the rayon fibers 1. For example, each may be longer than 0.0 mm and 300.0 mm or less. More specifically, the lower limit of each may be longer than 0.0 mm, preferably 1.0 mm or more, and more preferably 10.0 mm or more. The upper limit of each may be 300.0 mm or less, preferably 200.0 mm or less, more preferably 100.0 mm or less, and even more preferably 50.0 mm or less. Furthermore, each lower limit of the length may be combined with any of the upper limits.

[0043] In a single blended yarn 10, the lengths of the rayon fibers 1 and the non-rayon fibers 11 may be approximately the same, or they may be different (the length of the rayon fibers 1 may be longer or shorter than the length of the non-rayon fibers 11). Furthermore, in this invention, "the length of the rayon fiber 1 and the length of the non-rayon fiber 11 are approximately the same" may mean that the difference ΔD between the length of the rayon fiber 1 and the length of the non-rayon fiber 11 is 0.0 mm or more and 1.0 mm or less. To illustrate the single fiber fineness and length of the rayon fibers 1, which are short fibers in the blended yarn 10 described above, in the case of a blended yarn of rayon and cotton, the rayon fibers 1, which are short fibers, may, for example, have a single fiber fineness of 1.5 dtex or more and 1.7 dtex or less and a length of 38 mm (in this case, the cotton fibers may, for example, have a single fiber fineness of 1.0 dtex or more and 2.0 dtex or less and a length of approximately 28 mm). In the case of a blended yarn of rayon and acrylic, the rayon fibers 1, which are short fibers, may, for example, have a single fiber fineness of 3.3 dtex and a length of 51 mm or more and 89 mm or less (in this case, the acrylic fibers may, for example, have a single fiber fineness of 3.0 dtex or more and 4.0 dtex or less and a length of approximately 31 mm or more and approximately 109 mm or less).

[0044] <Textile Products 50> As shown in Figure 6, the textile product 50 is a product that uses the rayon fiber 1 described above. Furthermore, since textile products 50 sometimes include yarn made solely from rayon fibers (rayon yarn) that is sold, textile products 50 also include rayon yarn, and since the aforementioned blended yarn 10 can be said to be rayon yarn, it can also be said that the blended yarn 10 is included in textile products 50. Furthermore, textile products 50 also include woven fabrics made from rayon yarn or blended yarn 10, knitted fabrics made from rayon yarn, etc., and nonwoven fabrics made from rayon yarn, etc. In other words, textile product 50 can be said to be a product that uses at least one of the following: woven fabrics, knitted fabrics, nonwoven fabrics, etc., or rayon yarn, blended yarn 10, or rayon fiber 1. Below, we will first describe rayon yarn, which is a yarn made using rayon fiber 1.

[0045] Rayon yarn can be described as a spun yarn (or staple yarn or spun yarn) composed of multiple rayon fibers 1, especially when the rayon fiber 1 is a short fiber, or as a monofilament yarn composed of one rayon fiber 1, or as a multifilament yarn composed of multiple rayon fibers 1, when the rayon fiber 1 is a long fiber. The total fineness of the rayon yarn is not particularly limited, but for example, it may be between 10 dtex and 2000 dtex. More specifically, the lower limit may be 10 dtex or more, preferably 20 dtex or more, and even more preferably 50 dtex or more, while the upper limit may be 2000 dtex or less, preferably 1000 dtex or less, and even more preferably 500 dtex or less. Furthermore, each of these lower limits of total fineness may be combined with any of the upper limits.

[0046] As for textile products 50, the fabrics woven with rayon yarn, etc., may be of any weave structure, such as plain weave, twill weave, satin weave (five-ply satin weave, warp-shifted satin weave, etc.), double weave, or multi-layered weaves of two or more layers. As for textile products 50, knitted fabrics made from rayon yarn, etc., can be of any knitting structure, such as warp knitting like tricot knitting or weft knitting like circular knitting. As the fabric of the textile product 50, the nonwoven fabric composed of rayon yarn, etc., may be of any composition, but for example, it may be a needle-punched nonwoven fabric in which fibers are caught on a reciprocating needle and intertwined with each other, a spunbond nonwoven fabric in which long fibers spun from a nozzle are laminated and bonded on a moving screen, a thermal-bonded nonwoven fabric containing heat-fusible fibers and formed by heating, a stitch-bonded nonwoven fabric, etc., which are bonded by the needle-punching method, etc. To give an example of the single fiber fineness and length of the rayon fiber 1, which is a short fiber in the nonwoven fabric described here as the textile product 50, it may be a single fiber fineness of 6.6 dtex and a length of 64 mm.

[0047] Furthermore, textile products 50 may include innerwear, outerwear, supporters, socks, tights, sportswear, pajamas, belly warmers, hats, and other clothing worn by people, as well as bedding, outdoor products, curtains, rugs, and other items. These textile products 50 can be said to be composed of fabrics made using the aforementioned rayon yarn, blended yarn 10, rayon yarn, etc. (In the case of fabrics, they can also be said to be sewn together). Furthermore, the textile product 50 may optionally contain extender pigments or fillers such as titanium dioxide and calcium carbonate, or materials to which deodorants, antibacterial agents, antifungal agents, flame retardants, water repellents, stain repellents, colorants, fragrances, foaming agents, etc., may be added. The textile product 50 may be any color, including black, brown, blue, white, red, orange, yellow, green, and purple, and its saturation and brightness may be any value. The pattern of the textile product 50 may also be any, including solid colors, plant patterns such as flowers and trees, animal patterns, geometric patterns, and patterns created by surface irregularities. Furthermore, there are no particular limitations on the color of the blended yarn 10 using rayon fiber 1 or the rayon yarn, but for example, it may be gray, or it may be black through dyeing.

[0048] Furthermore, the textile products 50 described above may also use yarns that do not contain rayon fibers 1 (i.e., yarns that use only non-rayon fibers 11), in addition to rayon yarns and blended yarns 10. Examples of textile products 50 are described below. As shown in Figure 6(a), the belly band textile product 50 is composed of a striped knitted fabric, which is made by alternating between gray blended yarn 10 (a blend of rayon fiber 1 and cotton fiber) and white non-rayon yarn (silk fiber yarn). Furthermore, the proportion of each fiber in the entire belly band textile product 50 may be, for example, 43% rayon fiber 1, 49% cotton fiber, 7% silk fiber, and 1% other non-rayon fiber yarn (polyurethane fiber). Furthermore, as shown in Figures 6(b) to (d), the inner textile product 50 is made of gray blended yarn 10 (a blend of rayon fiber 1 and cotton fiber), and the skin-facing (inside) side of this inner textile product 50 is brushed and has a fuzzy texture like nonwoven fabric (see Figure 6(d) in particular, which shows the skin-facing side around the neckline of the inner garment).

[0049] <Method for manufacturing rayon fiber 1> As shown in Figure 7, the method for producing the rayon fiber 1 described above (hereinafter also referred to as "the production method") comprises at least a dry grinding step P1, a wet grinding step P2, and a spinning step P3, which will be described later. The manufacturing method may include a cutting process P4, which will be described later. Here, in the manufacturing method, if it includes a dry grinding step P1, a wet grinding step P2, and a spinning step P3, it is considered the first embodiment, and if it includes a dry grinding step P1, a wet grinding step P2, a spinning step P3, and a cutting step P4, it is considered the second embodiment. Furthermore, the rayon fiber 1 produced by the manufacturing method of the first embodiment, which does not include a cutting step P4, can be said to be a filament (long fiber), and the rayon fiber 1 produced by the manufacturing method of the second embodiment, which includes a cutting step P4, can be said to be a staple (short fiber).

[0050] In addition, the first and second embodiments of the manufacturing method may include a raw material preparation step described later, or a grinding step described later for dry and wet grinding of charcoal and zinc oxide, or a crimping step described later. Furthermore, in this manufacturing method, the dry grinding process P1 and the wet grinding process P2 may be carried out continuously (for example, continuously ground in one device), or they may be carried out in a batch (for example, the device that performs the dry grinding process P1 and the device that performs the wet grinding process P2 may be separate).

[0051] <Dry grinding process P1> As shown in Figure 7, the dry grinding process P1 is a process in which the lava fine particles 2 described above are ground by dry grinding. In this dry grinding process P1, the lava particles 2 are made to contain particles with a shape that includes protrusions (the lava particles 2 are made to contain particles with a shape that includes protrusions). In other words, in the dry grinding process P1, the lava particles 2 are ground while particles with a shape that includes protrusions 2a are generated. Furthermore, in the dry grinding process P1, the lava particles 2 may also be ground using non-lava material, as described later. Furthermore, in this invention, "dry grinding" refers to the grinding of an object in a dry state (not wetted with liquid) in the atmosphere or a gas such as an inert gas. In this case, if a solvent is to be specified, the gas in question is the solvent.

[0052] The size of the lava particles 2 after dry grinding in this dry grinding process P1 is not particularly limited, but may be expressed, for example, by the maximum particle size or average particle size measured by the "particle size distribution analyzer MT3000II" mentioned above. Regarding the maximum particle size of the lava particles 2 after dry grinding in the dry grinding process P1, for example, it may be between 1.0 μm and 10.0 μm. More specifically, the lower limit may be 1.0 μm or more, preferably 2.0 μm or more, and even more preferably 3.0 μm or more, while the upper limit may be 10.0 μm or less, preferably 8.0 μm or less, and even more preferably 6.0 μm or less. Furthermore, each of these lower limits for the maximum particle size may be combined with any of the upper limits. Furthermore, regarding the average particle size of the lava particles 2 after dry grinding in the dry grinding process P1, for example, it may be between 1.0 μm and 5.0 μm. More specifically, the lower limit may be 1.0 μm or more, preferably 1.5 μm or more, and even more preferably 2.0 μm or more, while the upper limit may be 5.0 μm or less, preferably 4.5 μm or less, and even more preferably 4.0 μm or less. Note that each of these lower limits for average particle size may be combined with any of the upper limits. Furthermore, the numerical ranges for the maximum particle size and average particle size of the lava particles 2 after dry grinding in the dry grinding process P1 may partially overlap with the numerical ranges for the maximum particle size and average particle size of the lava particles 2 after wet grinding in the wet grinding process P2 described later.

[0053] There are no particular limitations on the equipment (also called a crusher) used to perform this dry crushing process P1, but examples include jaw crushers (crushers that crush lava between fixed and movable teeth), gyroscope crushers (crushers that crush lava between the inside of an open conical casing and the inside of a cone set upright within it), crushing rolls (crushers that crush lava (or lava particles) between two rolls), hammer mills (crushers that crush lava (or lava particles) with one or more hammer-shaped impactors rotating inside a crushing chamber (a cylindrical or other container)), roller mills (crushers that crush lava (or lava particles) with one or more rollers inside a crushing chamber), and jet mills (crush lava particles (or lava fine particles) together or between lava particles by a jet stream inside a crushing chamber). This may include, or a combination of, a grinder (which pulverizes rock particles (or lava particles) by colliding them with non-lava materials as described below), a ball mill (a grinder that rotates a grinding chamber containing lava particles (or lava particles) and non-lava materials (approximately spherical) to pulverize them by colliding them with each other or with non-lava materials), a vibrating ball mill (a grinder that vibrates (without rotating) a grinding chamber containing lava particles (or lava particles) and non-lava materials (approximately spherical) to pulverize them by colliding them with each other or with non-lava materials), a planetary mill (a grinder that rotates and revolves a grinding chamber (also called a mill pot) containing lava particles (or lava particles) and non-lava materials (approximately spherical) to pulverize them by colliding them with each other or with non-lava materials), or a combination of these.

[0054] In such crushing machines, dry crushing includes volumetric crushing and / or surface crushing. Volumetric and surface crushing in dry crushing can be said to occur through compression, impact, shear, friction, collision, etc. Applying these compressions to the crushing machines described above, dry crushing can be said to occur through compression in jaw crushers, gyroscope crushers, and crushing rolls; dry crushing can be said to occur through impact and shear in hammer mills; dry crushing can be said to occur through compression and shear in roller mills; dry crushing can be said to occur through impact and collision in jet mills; dry crushing can be said to occur through impact, friction, and collision in ball mills; dry crushing can be said to occur through shear, friction, and collision in vibrating ball mills; and dry crushing can be said to occur through friction, impact, and compression in planetary mills. In addition, in the dry grinding process P1, grinding aids (aids to prevent the adhesion and aggregation of lava particles 2) may be used, dry grinding may be performed at a low temperature (also called low-temperature grinding), or the lava particles 2 may be crushed (the lava particles 2 that have been ground and adhered together may be broken apart).

[0055] <Non-lava body> The non-lava body is an object made of a different material than the lava particles 2 described above (an object made of a material other than lava), and may be used in the dry grinding process P1 described above or the wet grinding process P2 described later. The shape and size of the non-lava body are not particularly limited, but for example, it may be roughly spherical (also called a bead or ball depending on its size (diameter)). A roughly spherical non-lava body may be used in the aforementioned crushing machines, such as a jet mill, ball mill, vibrating ball mill, or planetary mill. Other non-lava materials may include the fixed or movable teeth in a jaw crusher, the conical casing or cone in a gyroscope crusher, the two rolls in a crushing roll, the crushing chamber or hammer-shaped impactor in a hammer mill, or the crushing chamber or roller in a roller mill. Furthermore, the crushing chambers in jet mills, ball mills, vibrating ball mills, and planetary mills can also be considered non-lava materials. In the following discussion, non-lava bodies will be described primarily as being roughly spherical (so to speak, roughly spherical non-lava bodies).

[0056] There are no particular limitations on the specific materials used for non-lava bodies, but they may include, for example, zirconia (zirconium dioxide), or other materials such as glass, alumina (aluminum oxide), silica-based ceramics, silicon nitride, titania (titanium dioxide), and Sialon (registered trademark, a compound of silicon nitride, alumina, and silica), or combinations thereof. Furthermore, the specific material of the non-lava body is something other than lava, and as will be discussed later, it can also be said that it is not charcoal or zinc oxide.

[0057] <Wet grinding process P2> As shown in Figure 7, the wet grinding process P2 is a process in which the lava fine particles 2, which have been ground (dry ground) in the dry grinding process P1 described above, are ground using wet grinding. In this wet grinding process P2, the lava particles 2 are made to contain particles with a shape that includes protrusions (the lava particles 2 are made to contain particles with a shape that includes protrusions), which means that in the wet grinding process P2, while grinding the lava particles 2, particles with a shape that includes protrusions 2a are also produced. Furthermore, in the wet grinding process P2, the non-lava material described above may also be used to grind the lava particles 2. Here, "wet grinding" in the present invention means grinding an object in a liquid such as water while it is wet with the liquid (method), and in this case, the liquid can be said to be a solvent.

[0058] The size of the lava particles 2 after wet grinding in this wet grinding process P2 is not particularly limited, but may be expressed, for example, by the maximum particle size or average particle size measured by the "particle size distribution analyzer MT3000II" mentioned above. Regarding the maximum particle size of the lava particles 2 after wet grinding in wet grinding step P2, for example, it may be between 0.5 μm and 6.0 μm. More specifically, the lower limit may be 0.5 μm or more, preferably 1.0 μm or more, and even more preferably 1.5 μm or more, while the upper limit may be 5.0 μm or less, preferably 4.0 μm or less, and even more preferably 2.0 μm or less. Furthermore, each of these lower limits for the maximum particle size may be combined with any of the upper limits. Furthermore, regarding the average particle size of the lava fine particles 2 after wet grinding in the wet grinding process P2, for example, it may be 0.01 μm or more and 2.00 μm or less. More specifically, the lower limit may be 0.01 μm or more, preferably 0.05 μm or more, and even more preferably 0.10 μm or more, and the upper limit may be 2.00 μm or less, preferably 1.00 μm or less, and even more preferably 0.50 μm or less. Note that each of these lower limits for average particle size may be combined with any of the upper limits.

[0059] The apparatus (also called a grinder) used to perform this wet grinding process P2 is not particularly limited, but may include, for example, a bead mill or attritor, a wet media agitation type grinder (a grinder that rotates a grinding chamber containing a liquid, lava particles (or lava microparticles), and roughly spherical non-lava material to cause collisions between lava particles, etc., and between lava particles, etc., and non-lava material) or a planetary mill (a grinder that rotates and revolves a grinding chamber containing a liquid, lava particles (or lava microparticles), and roughly spherical non-lava material to cause collisions between lava particles, etc., and between lava particles, etc., and non-lava material) or a combination of these. Grinding in such grinders (wet grinding) also includes volume grinding and / or surface grinding. Volume grinding and surface grinding in wet grinding can be said to occur due to impact, shear, friction, collision, compression, etc. Applying these impacts, etc., to the grinders described above, it can be said that wet grinding is performed in wet media agitation type grinders by impact, shear, friction, and collision, while dry grinding is performed in planetary mills by friction, impact, collision, and compression. In addition, in the wet grinding process P2, grinding aids (aids to prevent the adhesion and aggregation of lava particles 2) may be used, or the lava particles 2 may be dispersed (the ground and adhered aggregated lava particles 2 are separated and dispersed in the solvent liquid).

[0060] <Spinning Process P3> As shown in Figure 7, the spinning process P3 is a process in which the lava fine particles 2, which have been pulverized in the wet grinding process P2 described above, are mixed with a solution in which cellulose fiber is dissolved, and this raw solution is spun into the rayon fibers 1 in which gaps 1a have been formed. In this spinning process P3, lava particles 2 are present inside the gaps 1a of the rayon fibers 1.

[0061] Here, "cellulose fiber" in this invention refers to at least one of the following: cellulose in wood pulp (pine, spruce, hemlock, etc.), bamboo, paper, etc.; cellulose in cotton linters (short fibers attached to the surface of cotton seeds); or cellulose in eucalyptus trees, etc. This cellulose is the basis of rayon fiber 1. Furthermore, fibers in which cellulose from wood pulp is the fiber are mainly produced as rayon or polynosic; fibers in which cellulose from cotton linters is the fiber are mainly produced as cupro; and fibers in which cellulose from eucalyptus trees, etc. is the fiber are mainly produced as lyocell. These rayon, polynosic, cupro, and lyocell fibers are collectively referred to as rayon fiber (so to speak, rayon-based fiber) 1 in this invention. Furthermore, in the present invention, "solution in which cellulose fibers are dissolved" refers to a liquid in which the cellulose fibers described above are dissolved. For cellulose fibers such as wood pulp, it means an alkaline aqueous solution obtained by reacting the fibers with an alkali (caustic soda) and carbon disulfide (a yellowish-brown viscous substance obtained by reacting the cellulose with an alkali and carbon disulfide, dissolved in water or a dilute alkaline solution). For cellulose fibers such as cotton linters, it means a solution in which the fibers are dissolved in a copper ammonia solution. For cellulose fibers such as eucalyptus wood, it means a solution in which the cellulose is dissolved in an aqueous solution of N-methylmorpholine N-oxide. Furthermore, in this invention, "stock solution (stock solution in which lava particles 2 are mixed with a solution in which cellulose fiber is dissolved)" means a liquid in which the above-mentioned lava particles 2 are mixed with the above-mentioned cellulose fiber solution (the lava particles 2 are mixed into the cellulose fiber solution).

[0062] In spinning step P3, the above-mentioned raw material is extruded into a sulfuric acid aqueous solution through one or more holes (openings) provided in the die, stretched and solidified, and then washed, bleached, or washed with dilute sulfuric acid to spin rayon fibers 1 from the raw material. When rayon fibers 1 are spun from the raw material, gaps 1a are formed in the rayon fibers 1, and at the same time, lava particles 2 are present inside these gaps 1a. There are no particular limitations on the opening shape of the spinneret used in this spinning process P3, but for example, with respect to the cross-sectional shape of the rayon fiber 1 described above, <1> It may be roughly petal-shaped (a shape in which multiple folds are formed on the lateral surface, and the number of petals may be, for example, four or more), <3> This could be a shape in which at least a part of the ribbon (the linear part in cross-section) is rolled up (hereinafter referred to as "rolled ribbon shape"), <4> It is roughly circular in shape, <5> It may be roughly Y-shaped or have other shapes. Furthermore, the cross-sectional shape of rayon fiber 1 is <2> If the shape is roughly tubular (it may also be roughly circular, with a hollow interior, such as in the center), the opening shape of the nozzle may be made roughly C-shaped or the like.

[0063] Furthermore, there are no particular limitations on the size of the opening in the spinneret during the spinning process P3, however, the shape of the spinneret opening is <4> Assuming that the cross-sectional shape is approximately circular, for example, the diameter may be slightly smaller than the diameter when the cross-sectional shape of the rayon fiber 1 is approximately circular. More specifically, it may be 2.0 μm or more and 40.0 μm or less. To elaborate further, the lower limit may be 2.0 μm or more, preferably 5.0 μm or more, and even more preferably 8.0 μm or more, and the upper limit may be 40.0 μm or less, preferably 27.0 μm or less, and even more preferably 18.0 μm or less. Note that each of these lower limits may be combined with any of the upper limits. In addition, the stock solution in spinning process P3 may be a mixture of the cellulose fiber solution described above with not only lava particles 2, but also the carbon particles 3 and zinc oxide particles 4 described above. In this case, when rayon fibers 1 are spun from the stock solution, the carbon particles 3 and zinc oxide particles 4 will also be present inside the gaps 1a of the rayon fibers 1.

[0064] <Cutting process P4> As shown in Figure 7, the cutting step P4 is a step in which the rayon fibers 1 spun in the spinning step P3 described above are cut to a predetermined length. In other words, the rayon fiber 1 produced through the cutting process P4 becomes a short fiber (rayon staple). The length of the rayon fibers 1 short fibers cut in this cutting process P4 is not particularly limited, but may be, for example, 1 mm or more and 500 mm or less. More specifically, the lower limit may be 1 mm or more, preferably 10 mm or more, and more preferably 30 mm or more, and the upper limit may be 500 mm or less, preferably 200 mm or less, and more preferably 100 mm or less. Note that each of these lower limits may be combined with any of the upper limits.

[0065] <Other processes (not shown)> In addition to the above, the manufacturing method may also include a stock solution preparation step in which the lava particles 2 mentioned above are mixed into a cellulose fiber solution to prepare a stock solution. Furthermore, the manufacturing method may include steps (such as a dry grinding step, a wet grinding step, a dry grinding step, or a wet grinding step) of charcoal or zinc oxide to obtain charcoal fine particles or zinc oxide fine particles. Such raw material preparation steps and each grinding step may be performed before the dry grinding step P1 described above, or in parallel with the dry grinding step P1 and the wet grinding step P2 (at least before the spinning step P3). In addition to the above, the manufacturing method may also include a crimping step in which the short fiber rayon fiber 1 is crimped (the rayon fiber 1 is crimped), and this crimping step may be performed after the cutting step P4 described above, or conversely, before the cutting step P4 (that is, the crimped rayon fiber 1 may be cut in the cutting step P4).

[0066] <Other> The present invention is not limited to the embodiments described above. The individual components, or the overall structure, shape, dimensions, etc., of the rayon fiber 1, the blended yarn 10, the textile product 50, the method for manufacturing the rayon fiber 1, etc., can be appropriately modified in accordance with the spirit of the present invention. The lava particles 2 may include not only particles with a shape in which a protrusion 2a is formed, but also particles without a shape in which a protrusion 2a is formed (i.e., perfectly spherical particles). In this case, there is no particular limit to the proportion of particles with a shape in which a protrusion 2a is formed within the total lava particles 2, but it may be greater than the proportion of particles without a shape in which a protrusion 2a is formed (for example, 50% or more), or the lower limit may be 70% or more, 90% or more, 95% or more, or 99% or more (conversely, the proportion of particles without a shape in which a protrusion 2a is formed may be less than 50%, or the lower limit may be less than 30%, less than 10%, less than 5%, or less than 1%). Furthermore, there is no particular limit to the upper limit of the proportion of particles with a shape in which a protrusion 2a is formed within the lava particles 2, but it may be 100%, for example. Furthermore, the carbon microparticles 3 and / or zinc oxide microparticles 4 may include not only microparticles with protrusions 3a and 4a formed thereon but also microparticles without such protrusions (so-called spherical shape). In this case, for example, in the entire carbon microparticles 3 or zinc oxide microparticles 4, the proportion of microparticles with protrusions 3a and 4a formed thereon may be greater than the proportion of microparticles without such protrusions (50% or more), or may be 70% or more, 90% or more, 95% or more, 99% or more (conversely, the proportion of microparticles without protrusions 3a and 4a may be less than 50%, or may be less than 30%, 10%, 5%, or 1%). There is no particular limitation on the upper limit of the proportion of microparticles with protrusions 3a and 4a formed on the carbon microparticles 3 or zinc oxide microparticles 4, and it may be, for example, 100%. Furthermore, the "shape having protrusion 2a" and "shape having protrusions 3a and 4a" in the present invention may be expressed using the degree of concavity and convexity (concavity-convexity coefficient). This degree of concavity and convexity is related to a predetermined cross-section (for example, the maximum projected cross-section of the microparticle) of the lava microparticles 2, carbon microparticles 3, and zinc oxide microparticles 4, and using the cross-sectional area S of the cross-section and the outer periphery L of the cross-section, the degree of concavity and convexity = 4πS / L 2 is obtained. In addition, when the cross-section is a new circle, using the radius r of the new circle, S = πr 2 , L = 2πr, so the degree of concavity and convexity = 4πS / L 2 = 4π(πr 2 ) / (2πr) 2 = 4π 2 r 2 / 4π 2 r 2 = 1. That is, it can be said that the degree of concavity and convexity approaches 0 as the concavity and convexity increase. The value of such a degree of concavity and convexity is not particularly limited. For example,it may be greater than 0 and less than 1. More specifically, the lower limit value may be greater than 0.0, preferably 0.1 or more, more preferably 0.2 or more, and the upper limit value may be less than 1.0, preferably 0.9 or less, more preferably 0.8 or less. In addition, each lower limit value of this degree of concavity and convexity may be combined with any of the upper limit values.

[0067] Lava particles 2 may have a silicon dioxide content of less than 48.0% or greater than 53.0%. Neither the carbon nanoparticles 3 nor the zinc oxide nanoparticles 4 are necessarily included in the rayon fiber 1. Conversely, tourmaline nanoparticles (tourmaline nanoparticles) are also necessary in the rayon fiber 1. In this case, the tourmaline nanoparticles are also located inside the gaps 1a in the rayon fiber 1, and the tourmaline nanoparticles may also have a shape in which convex portions are formed. In the blended yarn 10, the difference ΔD between the length of the rayon fiber 1 and the length of the non-rayon fiber 11 may be greater than 20 mm. In the method for producing rayon fibers 1, lava fine particles 2 may be crushed without using non-lava material in either the dry crushing step P1 or the wet crushing step P2. The method for producing rayon fibers 1 does not necessarily have to include at least one of the following steps: cutting step P4, raw material preparation step, carbon dry grinding step, carbon wet grinding step, zinc oxide dry grinding step, zinc oxide wet grinding step, or crimping step.

[0068] The method for manufacturing rayon fiber 1 described so far is a method for manufacturing rayon fiber 1 itself, but the method for manufacturing blended yarn 10 may include the above-described method for manufacturing rayon fiber 1, as well as a blending step of blending rayon fiber 1 with non-rayon fiber 11. Furthermore, the method for manufacturing rayon yarn may also include the above-described manufacturing method for rayon fiber 1, while also comprising a spinning process for spinning only short-fiber rayon fiber 1. Furthermore, the manufacturing method for the textile product 50 may also include the above-described manufacturing method for the rayon fiber 1, as well as a sewing process for sewing (joining together or finishing the edges of the fabric) a woven or knitted fabric using the rayon fiber 1. [Industrial applicability]

[0069] The rayon fibers according to the present invention, and the rayon fibers produced by the manufacturing method according to the present invention, may be used in blended yarns by blending them with non-rayon fibers other than the rayon fibers, or in yarns (whether filament yarns or spun yarns) using only the rayon fibers, or in innerwear and outerwear (items worn by people, including shirts), supporters, leg warmers, socks, tights (including spats), sportswear, pajamas, belly warmers (including those where the belly warmer and shorts are integrated), hats, and other clothing items using the rayon fibers or blended yarns. In addition to these, they can be used in any textile product such as bedding, outdoor products, curtains, and rugs. The blended yarn according to the present invention may be used for innerwear, outerwear, supporters, socks, tights, sportswear, pajamas, belly warmers, hats, and other clothing items. In addition to these, it can be used for any textile product, such as bedding, outdoor products, curtains, and rugs. The textile products according to the present invention can be used as innerwear, outerwear, supporters, socks, tights, sportswear, pajamas, belly warmers, hats, and other clothing items, or they can be used as bedding, outdoor products, curtains, rugs, and any other type of product. [Explanation of Symbols]

[0070] 1. Rayon fiber 1a Gaps in rayon fibers 2. Lava particles 2a Protrusions of lava particles 3 Charcoal 4. Zinc Oxide 10 Blended yarn 11 Non-rayon fibers 50 Textile Products ΔD: Difference in length between non-rayon and rayon fibers P1 Dry grinding process P2 Wet Grinding Process P3 Spinning Process

Claims

1. Rayon fibers containing lava particles (2), The rayon fiber has a gap (1a) formed in it. The lava particles (2) are present inside the gap (1a). The rayon fiber is characterized in that the lava particles (2) have a shape in which convex portions are formed.

2. The rayon fiber according to claim 1, characterized in that the lava fine particles (2) have a silicon dioxide content of 48.0% or more and 53.0% or less.

3. The rayon fibers also contain fine particles of charcoal and / or zinc oxide. The fine particles of carbon and / or zinc oxide are also present inside the gap (1a). The rayon fiber according to claim 1, characterized in that the carbon and / or zinc oxide fine particles also have a shape in which a convex portion is formed.

4. A blended yarn obtained by blending a rayon fiber (1) according to any one of claims 1 to 3 with a non-rayon fiber (11) which is a fiber other than the rayon fiber (1), The rayon fibers (1) and non-rayon fibers (11) are short fibers, A blended yarn characterized in that the difference (ΔD) between the length of the rayon fiber (1) and the length of the non-rayon fiber (11) is 0 mm or more and 20 mm or less.

5. A textile product characterized by using the rayon fiber (1) described in any one of claims 1 to 3.

6. A method for producing rayon fibers (1) containing lava particles (2), A dry grinding step (P1) is performed to grind the lava fine particles (2) by dry grinding, A wet grinding step (P2) is performed to grind the lava particles (2) that have been ground in the dry grinding step (P1) in a wet grinding step, The spinning process (P3) involves mixing the lava particles (2) that have been pulverized in the wet grinding process (P2) with a solution in which cellulose fiber is dissolved, and spinning the resulting stock solution into the rayon fibers (1) in which gaps (1a) have been formed. In the spinning process (P3), the lava particles (2) are placed inside the gaps (1a) of the rayon fibers (1). A method for producing rayon fibers, characterized in that the dry grinding step (P1) and the wet grinding step (P2) include fine particles (2) having a shape in which protrusions are formed.

7. The method for producing rayon fibers according to claim 6, characterized in that in the dry grinding step (P1) and / or wet grinding step (P2), a non-lava material, which is a different material from the lava fine particles (2), is also used to grind the lava fine particles (2).

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