JP6487171B2 - Functional fiber yarn - Google Patents

Description

  The present invention relates to a functional fiber yarn excellent in heat generation performance and far infrared radiation performance.

  Conventionally, many knitted and knitted fabrics for the purpose of keeping warm have been put on the market, and various techniques such as the use of dead air by hollow fibers, the use of moisture absorption heat generation effect, the method of converting sunlight into heat, etc. were used. Material has been proposed. However, the use of dead air is a passive method of suppressing heat dissipation by including air, so there is a limit to heat retention against the cold, and the use of an air layer makes the woven or knitted fabric bulky. There was a problem that. In addition, the use of the moisture absorption heat generation effect generates heat by absorbing moisture such as insensitive excretion, but when it absorbs moisture, it generates heat, but it has low sustainability and immediately releases heat. There was a problem. On the other hand, the method of converting sunlight into heat has a problem that although a sufficient effect is recognized outdoors in fine weather, the effect is hardly expected in rainy weather or indoors.

  On the other hand, in recent years, a technique for imparting a heat retaining effect to fibers using far-infrared radioactive fine particles has been proposed. For example, Patent Document 1 discloses a fiber containing 3% by weight or more of far-infrared radioactive fine particles. In Patent Document 2, mica having an average particle diameter of 2.5 to 5.0 μm and mica having an average particle diameter of 8.0 to 13.0 μm are added to polyester in a ratio of 4/6 to 8/2 in total. Far-infrared ray irradiating polyester containing ˜8% by weight is disclosed. Further, Patent Document 3 discloses a sheath part made of a polymer containing 1 to 10% by weight of far-infrared radioactive fine particles exhibiting a specific far-infrared irradiation rate, and a core part made of a polymer containing 10 to 70% by weight of the fine particles. Disclosed is a far-infrared radioactive functional fiber. Further, Patent Document 4 discloses a functional fiber having a core-sheath structure including a thermoplastic polymer containing far-infrared radiation fine particles in a sheath portion, and the far-infrared radiation fine particles are 3% by weight of the whole fiber. A fiber is disclosed.

JP-A 63-227828 Japanese Patent Laid-Open No. 9-77961 JP 63-152413 A Japanese Patent Laid-Open No. 2-154209

  However, as in Patent Documents 1 to 4, in order to increase the heat retention effect of the fiber using only the far-infrared radioactive fine particles, it is necessary to contain or attach a large amount of the far-infrared radioactive fine particles, and the yarn breaks during spinning. There is a problem that the wear of the guide and the guide are likely to occur and the spinning operability is deteriorated. In the technique of Patent Document 4, although the far-infrared radioactive fine particles are localized in the sheath portion of the core-sheath structure, the spinning operability is improved, but it is still not satisfactory.

  Furthermore, as in Patent Documents 1 to 4, the technology for providing a warming effect to the fiber using only fine particles having far-infrared radiation characteristics has a limit to the possible warming effect and realizes sufficient warmth. The current situation has not yet been reached.

  The present invention is suitable for a woven or knitted fabric that is excellent in far-infrared radiation performance and heat generation performance, and that can sufficiently exhibit a heat retaining effect even in a room, and has good spinning operability and is less likely to cause guide wear when producing a woven or knitted fabric. Providing a functional fiber yarn is a technical issue.

  The inventors of the present invention have arrived at the present invention as a result of studies to solve the above problems. That is, this invention makes the following a summary.

(1) A yarn having a core-sheath structure and a functional fiber containing exothermic fine particles and far-infrared radiation fine particles in the core, wherein the exothermic fine particles and the The far-infrared radioactive fine particles are contained in an amount of 0.1 to 2.5 parts by mass with respect to 100 parts by mass of the core part, and both fine particles are 0.2 to 3.5 parts by mass in total with respect to 100 parts by mass of the core part. And a core-sheath mass ratio (core / sheath) is in the range of 75/25 to 10/90.
(2) In the functional fiber, the cross-sectional shape of the core portion is a multi-leaf type cross-sectional shape that extends radially from the center of the fiber, and the number of leaves of the multi-leaf type cross-sectional shape is in the range of 6 to 20. (1) The functional fiber yarn according to (1).
(3) The functional fiber yarn according to (1) or (2), wherein at least one of zirconium carbide and carbon is used as the exothermic fine particles, and mica is used as the far infrared radiation fine particles.

  ADVANTAGE OF THE INVENTION According to this invention, the functional fiber yarn suitable for comprising the woven / knitted fabric excellent in a heat retention effect can be provided. In the present invention, in the functional fiber constituting the functional fiber yarn, since the exothermic fine particles and far-infrared radiation fine particles are contained in the core portion, they are close to each other. For this reason, as a result of being able to utilize the heat | fever which an exothermic microparticles | fine-particles also raises the temperature of far-infrared radiation | emission fine particles themselves, more far-infrared rays are emitted and the further heat retention effect can be anticipated.

  Furthermore, in the present invention, by adopting a specific multi-leaf type cross-sectional shape as the cross-sectional shape of the fiber core portion, it is possible to further improve the spinning operability while further exerting the heat retaining effect.

It is a schematic diagram which illustrates the preferable cross-sectional shape of the functional fiber in this invention. It is a schematic diagram which illustrates the preferable cross-sectional shape of the functional fiber in this invention.

  Hereinafter, the present invention will be described in detail.

  The functional fiber yarn of this invention is comprised from a specific functional fiber. The functional fiber has a core-sheath structure in cross section, and contains a specific amount of exothermic fine particles and far-infrared radioactive fine particles in the core. Since the heat retention effect in the present invention is derived from such specific fine particles, the fiber containing the fine particles and the yarns and fabrics containing the fibers also have the same effect.

  The polymer constituting the functional fiber is not particularly limited as long as melt spinning is possible, and a polymer conventionally used as a raw material for the fiber can be used. Examples of such polymers include polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, and polytrimethylene terephthalate; polyamides such as nylon 6, nylon 66, nylon 46, nylon 11, and nylon 12; polypropylene, polyethylene, and the like. Polyolefins; Polychlorinated polymers such as polyvinyl chloride and polyvinylidene chloride; Fluoropolymers such as polytetrafluoroethylene and polyvinylidene fluoride; Biomass-derived monomers such as PLA (polylactic acid) and PBS (polybutylene succinate) Biomass polymer obtained by polymerization of the polymer; a copolymer comprising two or more monomers constituting these polymers;

  These polymers may be copolymers containing other constituent monomers in view of viscosity, thermal characteristics, compatibility, and the like. For example, when a polyester copolymer (copolyester) is used, aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid: adipic acid, succinic acid, suberic acid, sebacic acid, dodecanedioic acid Aliphatic dicarboxylic acids such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, etc .; glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid Hydroxycarboxylic acids such as hydroxyheptanoic acid and hydroxyoctanoic acid; copolymers of aliphatic lactones such as ε-caprolactone and polyesters may be used.

  In the present invention, exothermic fine particles are used. As the exothermic fine particles, for example, fine particles made of a substance capable of generating heat by absorbing electromagnetic waves (including sunlight) can be used. The exothermic fine particles used in the present invention are not particularly limited, and examples thereof include zirconium oxide, zirconium carbide, and carbon. Among these exothermic fine particles, zirconium carbide and carbon are preferably used from the viewpoint of further improving the spinning operability and the exothermic performance. These exothermic fine particles may be used individually by 1 type, and may be used in combination of 2 or more type.

  The average particle size of the exothermic fine particles is not particularly limited, and for example, 0.01 to 5 μm, preferably 0.05 to 3 μm, and more preferably 0.1 to 2 μm. When the average particle diameter of the exothermic fine particles is within the above range, a more excellent heat retention effect can be achieved without adversely affecting the spinning operability. Here, the average particle diameter is a volume average particle diameter measured using a laser diffraction scattering method particle size distribution measuring apparatus.

  Furthermore, although far-infrared radioactive fine particles are used in the present invention, any material can be used as the far-infrared radioactive fine particles as long as it is a substance capable of emitting far-infrared rays. Examples thereof include minerals such as mica, talc and calcite; oxide ceramics such as tin oxide, alumina and silicon dioxide; carbide ceramics such as silicon carbide and boron carbide; metals such as platinum and tungsten. Among these far infrared radiation fine particles, mica, tin oxide, talc, more preferably mica, tin oxide, and most preferably mica are preferable from the viewpoint of further improving the spinning operability and far infrared radiation performance. In particular, mica is suitable for the present invention because it has low hardness and is effective in suppressing guide wear in the weaving and knitting process. It is also preferable in that the price is relatively low. These far-infrared radioactive fine particles may be used alone or in combination of two or more.

  The average particle diameter of the far-infrared radioactive fine particles is not particularly limited, but for example, 4 μm or less, preferably 0.1 to 4 μm, more preferably 0.3 to 3 μm. If the average particle diameter of the far-infrared radiation fine particles is within the above range, a superior heat retention effect can be achieved without adversely affecting the spinning operability. Here, the average particle diameter is a volume average particle diameter measured using a laser diffraction scattering method particle size distribution measuring apparatus.

  The fiber used in the present invention contains the above exothermic fine particles and far-infrared radioactive fine particles. In this case, from the viewpoint of suppressing yarn breakage, roller wear, guide wear and the like during weaving and knitting, it is necessary to dispose both fine particles inside the fiber. That is, it is necessary to arrange the fine particles in the core portion after making the cross-sectional shape of the functional fiber into a core-sheath structure. If the fine particles are arranged in the fiber sheath, the fine particles are exposed on the fiber surface. If the yarn is run in this state, the rollers, guides and the like are gradually damaged.

  Any shape can be adopted as the cross-sectional shape of the fiber core. Specific examples include a circle, a triangle, and a star. For example, when a circle is employed, the fiber has a concentric core-sheath structure or an eccentric core-sheath structure. Among these, the concentric core-sheath structure is the most common shape of the core-sheath structure, and is preferable for stabilizing the spinning and drawing productivity. FIG. 1 illustrates a fiber cross section of a concentric core-sheath structure.

  And as content of both microparticles | fine-particles, 0.1-2.5 mass parts is contained with respect to 100 mass parts of core parts, respectively. When one of the contents of each fine particle is less than the above range, only a woven or knitted fabric lacking in either far-infrared radiation performance or heat generation performance can be obtained, and a woven or knitted fabric having a sufficient heat retaining effect cannot be obtained. On the other hand, when any content exceeds the above range, the spinning operability of the yarn is lowered. It is said that the productivity when spinning yarn, that is, the spinning operability, generally decreases when foreign matters are included in the fiber. In this sense, the fine particles correspond to foreign matters. From the viewpoint of operability, it is not preferable.

  In this invention, by containing exothermic fine particles in this way, sunlight can be efficiently converted into heat, and sufficient warmth can be imparted. At the same time, warmth can be maintained by the far-infrared radiation fine particles even when it is difficult to reach sunlight such as in rainy weather or indoors. Moreover, in the present invention, since the exothermic fine particles and the far-infrared radioactive fine particles are contained in the same portion (core portion) of the same fiber, they are close to each other. Thereby, the heat generated by the exothermic fine particles can be used not only for imparting warmth but also for increasing the temperature of the adjacent far-infrared radioactive fine particles themselves. Thereby, more far infrared rays are emitted from the far-infrared radioactive fine particles as the temperature rises, and as a result, a better heat retention effect is exhibited.

  In the present invention, since the heat retention effect is efficiently achieved as described above, it is not necessary to further increase the content of the fine particles, thereby ensuring the desired spinning operability. In the present invention, from the viewpoint of achieving both a heat retention effect and spinning operability, the functional fiber contains a total of 0.2 to 3.5 parts by mass of fine particles with respect to 100 parts by mass of the core. If the total content of both fine particles is below this range, a sufficient heat retention effect cannot be obtained, and if it exceeds this range, satisfactory spinning operability cannot be obtained.

  The functional fiber in the present invention contains a specific amount of specific fine particles as described above, and further includes various fine particles such as a matting agent, a flame retardant, an antioxidant, an antistatic agent, and an antibacterial agent as necessary. It may be included.

  Furthermore, the core-sheath mass ratio (core / sheath) of the functional fiber needs to be 75/25 to 10/90, and is preferably 50/50 to 20/80. When the core-sheath mass ratio satisfies this range, a more excellent heat retention effect can be achieved without adversely affecting the spinning operability.

  In the present invention, the cross-sectional shape of the functional fiber is a core-sheath structure, and the content and total content of the fine particles, and further the core-sheath mass ratio is defined within a specific range, thereby spinning while exhibiting a heat retaining effect. Although the operability can be improved, the present inventors have further studied, and it has been found that if the cross-sectional shape of the fiber core part is devised, both performances can be more compatible. Specifically, it has been found that a multi-leaf type cross-sectional shape may be adopted.

  Generally, the heat retention effect in a woven or knitted fabric tends to be strongly exerted by arranging more fine particles on the fiber surface layer. By reducing the distance between the position where the fine particles are mixed in the fiber and the outside air, the exothermic fine particles can absorb more light. As a result, the exothermic effect is enhanced. This is because the wearer can enjoy the far-infrared radiation effect more as a result of the distance from the body of the wearer being reduced. However, if the fine particles are arranged near the fiber surface layer, the core portion becomes considerably thick in the fiber cross section, and the content of the fine particles in the entire fiber is greatly increased. If it does so, spinning operativity will fall large.

  Therefore, as a result of studying the cross-sectional shape of the fiber core, the present inventors have adopted a shape that partially protrudes in the vicinity of the fiber surface layer, that is, if a multi-leaf type cross-sectional shape is adopted, the core portion and the outside air are partly used. It was found that the distance between and could be reduced, and more heat retention effect could be created. Based on this idea, further investigations were made on the optimum multi-leaf type cross-sectional shape. As a result, a multi-leaf type cross-sectional shape in which the number of leaves is in the range of 6 to 20 is formed. As a result, it has been found that it is possible to achieve both a heat retention effect and a spinning operability.

  As such a multi-leaf type cross-sectional shape, the one shown in FIG. 2 is exemplified, and a radial type shown in FIG. 2A, a separated fruit section type shown in FIGS. The connected fruit section type shown in FIG. Especially, the shape illustrated to (a) is preferable. In the shape in (a), the number of leaves is eight.

  The distance from the tip of the multi-leaf type cross-sectional shape to the edge of the fiber is the ratio (DC) of the shortest distance from the tip of the leaf to the edge of the fiber and the fiber radius, that is, DC = (edge of the fiber from the tip of the leaf DC calculated by the formula of (shortest distance to reach) / fiber radius × 100 (%) is preferably 40% or less, and more preferably 25% or less. By adopting such a numerical range, the heat retention effect can be further improved. The lower limit of DC is not particularly limited, but if designed to be too small, fine particles may be exposed on the fiber surface when the cross-sectional shape of the fiber core part collapses during spinning, drawing, weaving or knitting or yarn processing. This may cause thread breakage and guide wear. From such a point, DC is preferably 5% or more. The DC can be adjusted by appropriately selecting a spinning nozzle.

  The functional fiber yarn of the present invention is a yarn composed of such functional fibers, and is usually constituted by bundling a plurality of functional fibers.

  In the present invention, the form of the functional fiber may be staple or filament. In particular, when used as a filament, it can be used in any form of monofilament or multifilament, but multifilament is generally preferred. In this case, it is preferable that the multifilament is composed only of the functional fiber, but the multifilament may be composed by mixing with other arbitrary fibers as long as the effects of the present invention are not impaired.

  When the functional fiber yarn of the present invention is in the form of a multifilament yarn, the single yarn fineness is, for example, preferably 0.2 to 30 dtex, more preferably 1 to 10 dtex, and further preferably 2 to 5 dtex. Moreover, as total (total) fineness, 1-500 dtex is preferable, for example, 5-300 dtex is more preferable, 10-200 dtex is further more preferable. By reducing the single yarn fineness, the fiber surface area is increased, and accordingly, the far-infrared radiation performance and the heat generation performance can be improved, and the heat retention effect can be further enhanced. Further, when the single yarn fineness is reduced or false twist is applied, the air layer is increased, and as a result, a heat retaining effect due to dead air can be further added.

  The functional fiber yarn of the present invention can be obtained by a conventionally known method using the above-described melt-spinnable polymer, the exothermic fine particles, and the far infrared radiation fine particles. In this case, a desired functional fiber yarn is preferably prepared by preparing a mixture in which a polymer and both fine particles are mixed in advance, and performing a composite spinning of the mixture and the polymer.

  The method of mixing the polymer, the exothermic fine particles and the far-infrared emitting fine particles is not particularly limited. For example, a method of dry blending a polymer containing the exothermic fine particles and a polymer containing the far-infrared emitting fine particles, Examples include a method of adding far-infrared radioactive fine particles.

  As composite spinning, a POY method in which a semi-undrawn yarn is obtained by high-speed spinning at a spinning speed of 2000 m / min or higher; yarn that has been melt-spun once at a low speed of less than 2000 m / min or higher than 2000 m / min and wound up Examples thereof include a method of drawing and heat-treating the strip; a direct spinning drawing method in which drawing is carried out without winding.

  In the present invention, such a functional fiber yarn is used to form a woven or knitted fabric, but prior to this, the functional fiber yarn may be processed. Examples of the yarn processing include twisted yarn, false twist, interlace processing, and taslan processing. In particular, when a false twisted yarn is used, it is preferable that the false false twist is made after a semi-undrawn yarn. In yarn processing, other arbitrary fibers may be mixed as long as the effects of the present invention are not impaired. Usually, the functional fiber yarn of the present invention is preferably mixed in an amount of 50% by mass or more.

  In order to obtain a knitted or knitted fabric, the knitting and knitting may be performed using a known loom or knitting machine. Also in this case, other yarns may be combined as long as the effects of the present invention are not impaired.

  After weaving and knitting, post-processing is performed according to a conventionally known method. In this case, dyeing, coloring printing, embossing, water repellent processing, antibacterial processing, phosphorescent processing, deodorizing processing, and the like may be performed as necessary.

  The use of the knitted or knitted fabric according to the present invention is not particularly limited. For example, various inners, T-shirts, jackets, windbreakers, wet suits, ski wear, gloves, hats, tents, insoles of shoes, futon lining It is suitable as a raw material for textile products that are required to have high heat retention.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited to these.

  Each measuring method and evaluation method are as follows.

(1) Intrinsic Viscosity The intrinsic viscosity was measured based on a conventional method under the condition of a temperature of 20 ° C. using a mixture of equal mass of phenol and ethane tetrachloride as a solvent.

(2) Average particle diameter of far-infrared radioactive fine particles It measured using "SALD-7100" by Shimadzu Corporation. The measurement dispersion was prepared by diluting and mixing fine particles in an ethylene glycol solvent so that the diffraction / scattering light intensity was 40 to 60%, and this was used as the measurement dispersion. The measurement was performed 4 times, and the average was taken as the average particle size.

(3) DC
After taking out the functional fiber (single yarn) from the functional fiber yarn, the cross section of the single yarn was photographed using an optical microscope ("PCSCOPE PCS-81X (trade name)" manufactured by Inabata Sangyo Co., Ltd.), DC was calculated based on the following formula.
DC = (shortest distance from leaf tip to fiber edge) / fiber radius × 100 (%)
In this case, the shortest distance from each tip to the outer periphery of the fiber was measured for each leaf, and the average of them was defined as “the shortest distance from the tip of the leaf to the edge of the fiber”. When there was no leaf, the distance between the outer periphery of the core and the outer periphery of the fiber was measured starting from arbitrary 8 locations uniformly arranged on the outer periphery of the core. In addition, a line is drawn from the center of the fiber to the outer periphery of the fiber so as to pass through the tip of each leaf (or any eight locations uniformly arranged on the outer periphery of the core), and the average of them is “fiber Radius ”.

(4) Heat generation performance The fabric obtained in each Example and Comparative Example was irradiated with a reflex lamp so that the illuminance was 10,000 LUX, and the surface temperature of the fabric was observed by thermography from the back side. The environmental conditions for the measurement were 20 ° C. and 65% RH. Further, as a blank, except that exothermic fine particles and far-infrared emitting fine particles are not included, a woven fabric (Comparative Example 1) prepared using fibers having the same composition as each Example and Comparative Example is used. The temperature was measured. The heat generation characteristics were evaluated by calculating the difference between the measured surface temperature of each Example and Comparative Example and the surface temperature of the blank.

(5) Far-infrared radiation performance The far-infrared radiation intensity | strength of the textile fabric obtained by each Example and the comparative example was measured. The measurement was performed using an infrared spectrophotometer FT-IR apparatus at a measurement temperature of 40 ° C. and a measurement wavelength range of 5 to 20 μm. At that time, the far-infrared radiant intensity of the black body under the same conditions is also measured, and the ratio (%) of the radiant intensity of each fabric when the radiant intensity of the black body at each wavelength is defined as 100% is calculated at each wavelength. The average value of the ratio was calculated as the average emissivity (%). Moreover, the average emissivity (%) was similarly calculated | required using the blank fabric (comparative example 1). And far-infrared radiation performance was computed based on the following formula.
<Calculation formula for far-infrared radiation performance>
Far-infrared radiation performance = [(average emissivity of the obtained fabric (%) − average emissivity of blank (%)) / average emissivity of blank (%)] × 100

(6) Spinning operability The number of yarn breaks when operated for 24 hours to obtain functional fiber yarns was measured, and the spinning operability was evaluated based on the following criteria.
<Criteria for spinning operability>
○: Number of thread breaks 0-2 times Δ: Number of thread breaks 3-5 times ×: Number of thread breaks 6 times or more

(7) Guide wear property About the functional fiber yarn obtained in each Example and Comparative Example, after rewinding 100000 m with a rewind machine having a stainless steel traveler, the surface state of the traveler was observed with a microscope, and in accordance with the following criteria. The guide wear was evaluated.
<Guidelines for guide wear resistance>
○: No wear is observed, or there is slight wear but no problem.
Δ: Slightly worn.
X: Strong wear is recognized.

Example 1
As the fiber sheath material, polyethylene terephthalate having an intrinsic viscosity of 0.65 was prepared. On the other hand, as the core material, 98 parts by mass of polyethylene terephthalate having an intrinsic viscosity of 0.65, 1.0 part by mass of carbon as exothermic fine particles, and 1.0% of mica having an average particle diameter of 1.4 μm as far-infrared radioactive fine particles. What contained the mass part was prepared. Then, the sheath material and the core material are introduced into a composite spinning apparatus equipped with a 48-hole core-sheath composite nozzle plate, and the conditions of the core-sheath mass ratio (core / sheath) 20/80 and the spinning temperature of 290 ° C. And composite spinning. After spinning, the yarn was cooled and an oil was applied. Then, the yarn is continuously introduced into the first roller that rotates at a speed of 1400 m / min, and is thermally stretched 2.57 times with the second roller that rotates at a speed of 3600 m / min. Fiber yarn was used. Here, the first roller temperature was 95 ° C., and the second roller temperature was 100 ° C.

  The total fineness of the obtained functional fiber yarn is 65 dtex48f, the cross-sectional shape of the fiber has a core-sheath structure as shown in FIG. 2 (a), and the cross-section of the core has a multi-leaf type cross-sectional shape with 8 leaves. It was.

  Next, a polyester yarn 56dtex48f having the same configuration as that of the above functional fiber yarn is prepared except that carbon and mica are not included, and the above polyester fiber is used as a warp and the above functional fiber yarn is used as a weft. A plain machine was woven with a density of 153 yarns / 2.54 cm and a weft density of 111 yarns / 2.54 cm. Then, the raw machine was scoured according to a conventional method, dyed at 130 ° C., finished and set, and the desired woven fabric was obtained.

(Comparative Example 1)
A functional fiber yarn and a woven fabric were obtained in the same manner as in Example 1 except that only polyethylene terephthalate having an intrinsic viscosity of 0.65 was spun.

(Examples 2-9, Comparative Examples 2-4)
Except for changing the types, contents, and core-sheath mass ratio of the exothermic fine particles and far-infrared radioactive fine particles to those shown in Table 1, the same procedure as in Example 1 was carried out to obtain a functional fiber yarn and woven fabric. It was.

(Example 10)
A functional fiber yarn is obtained by spinning in the same manner as in Example 1 except that a concentric core-sheath structure as shown in FIG. 1 is adopted as the fiber cross-sectional shape (including the fine particles in the core material). Was performed in the same manner as in Example 1 to obtain a woven fabric.

  From the above, the woven fabric containing the functional fiber yarn of the present invention was able to realize both functions of heat generation and far-infrared emission at the same time, and was excellent in the heat retaining effect. In addition, the functional fiber yarn of the present invention was excellent in spinning operability during production, and was difficult to cause guide wear during weaving and knitting.

  In addition, since the thickness of the core part of the functional fiber yarn according to Example 6 became thicker in the fiber cross section, the content of fine particles in the entire fiber was increased. As a result, the spinning operability was higher than that in Example 1. Decreased relatively. Furthermore, as the thickness of the fiber core increases, some of the leaves of the fiber core are slightly exposed on the fiber surface during the spinning, drawing, and false twisting of the yarn, and the guide wear resistance is relatively low. Declined.

Further, from the results of Examples 1, 8, and 9, it was found that a combination of carbon and mica as fine particles was preferable in terms of the heat retaining effect.
The functional fiber yarn according to Example 10 has the same fiber sheath / core mass ratio and fine particle content as in Example 1, but the fiber shape has a concentric core / sheath structure, and the outer periphery of the core part. Since the distance between the fiber and the outer periphery of the fiber was longer than in the case of Example 1, the heat retaining effect was generally reduced as compared with the case of Example 1.

  On the other hand, in Comparative Examples 2 and 3, since the content of the fine particles contained in the fibers did not satisfy the predetermined range, the desired heat retention effect and spinning operability were lacking.

Moreover, in the comparative example 4, when the mass ratio of the fiber core part was too large, the thickness of the sheath part was increased, and as a result, the spinning operability and the guide wearability were reduced.

Claims (2)

The cross-section is a yarn composed of a functional fiber containing a core-sheath structure and containing carbon and mica in the core, and in the functional fiber, the carbon and the mica are added to 100 parts by mass of the core. 0.1 to 2.5 parts by mass of each, and 0.2 to 3.5 parts by mass in total of the carbon and the mica with respect to 100 parts by mass of the core, and a core-sheath mass ratio ( A functional fiber yarn having a core / sheath range of 75/25 to 10/90.   In the functional fiber, the cross-sectional shape of the core portion is a multi-leaf type cross-sectional shape extending radially from the substantially center of the fiber, and the number of leaves of the multi-leaf type cross-sectional shape is in the range of 6 to 20. The functional fiber yarn according to claim 1.

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