JP2015074863A - Heat-retaining fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric made of yarn appropriate for clothing for autumn and winter, having sustainable superior heat retaining effect independent of weather and excellent soft and warm feeling.SOLUTION: A heat-retaining fabric is made of a two-layer structure yarn with a core part made of a short-fiber bundle A and a sheath part made of a blended short-fiber bundle B. The short-fiber bundle A is made of a polyester short-fiber A containing far infrared radiation fine particles. The blended short-fiber bundle B is made of the polyester short-fiber B containing heat generating fine particles and at least one type of natural fiber and recycled fiber and has a mixed rate (polyester short-fiber B/sum of natural fiber and recycled fiber) within a range of 10/90 to 90/10. The core part and the sheath part of the two-layer structure yarn have a mass ratio (core part/sheath part) within a range of 10/90 to 60/40 and a twisting coefficient in a range of 2.0 to 4.0.

Description

  The present invention relates to a fabric that has far-infrared radiation performance and absorption heat conversion performance, is excellent in heat retaining effect, soft feeling and warm feeling, and is suitable for autumn and winter clothing.

  Many fabrics have been put on the market for the purpose of keeping warm, and various techniques such as the use of dead air with hollow fibers, the use of moisture absorption heat generation, and the method of converting sunlight into heat are used. Fabrics have been proposed. For example, as a technique using dead air by a hollow fiber, there has been proposed a fabric in which a hollow fiber is arranged in a binding yarn, a polyester false twist yarn is arranged on the front side of each side, and other yarns are arranged on the back side (for example, Patent Document 1).

  Moreover, as a thing using a moisture absorption exothermic effect, the cloth (for example, patent document 2) using a specific acrylic acid type moisture absorption / release moisture absorption exothermic fiber, N-methylol (meth) acrylamide, and a specific water-soluble cellulose molecule. A fabric (for example, Patent Document 3) using a hygroscopic exothermic cellulose fiber into which a polymerizable vinyl polymerizable compound is introduced has been proposed.

  Furthermore, as a method using a method of converting sunlight into heat, a fabric using polyester fibers containing specific solar-absorbing fine particles (for example, Patent Document 4) has been proposed.

  On the other hand, in recent years, a technique for imparting a heat retaining effect to a fabric using far-infrared radioactive fine particles has been proposed. For example, a fabric using polyester fibers containing a predetermined amount of titanium dioxide as the fine particles (for example, Patent Document 5), or a fabric using acrylic fibers containing a predetermined amount of a specific metal compound as the fine particles (for example, patents) Document 6) has been proposed.

JP 2002-235264 A Japanese Patent Publication No. 7-59762 Japanese Patent No. 2898623 JP-A-8-197659 JP 2009-97105 A JP 2007-270390 A

  However, since the method using dead air is a passive method of suppressing heat dissipation by including air, there is a limit to the heat retention effect against the cold, and since the air layer is used, the fabric becomes bulky. There was a problem of becoming.

  In addition, all the methods that use the hygroscopic heat generation effect are methods that promote heat generation by absorbing moisture due to sweating, etc., but when it absorbs moisture, it generates heat, but its sustainability is low and it immediately dissipates heat. There was a problem.

  Furthermore, the method of converting sunlight into heat has a problem that it can be expected to be effective when it is raining or indoors, although it is sufficiently effective outdoors in fine weather.

  As for the use of far-infrared radioactive fine particles, in order to obtain a desired heat retaining effect with only such fine particles, a large amount of far-infrared radioactive fine particles must be contained or adhered to the fibers, thereby making it possible to produce a process in raw yarn production. There was a problem that the passability (spinning operability) was lowered. In addition, there is a limit to the heat insulation effect that can be achieved only with this method, and the actual situation is that sufficient warmth has not been realized.

  Furthermore, all of the above methods are used only for fabrics using filament yarn, and no examples have been found yet applied to fabrics using spun yarn. The spun yarn has fluff on its surface. For this reason, fabrics using spun yarn are generally richer in swelling than fabrics using filament yarn, and have the advantage that various textures derived from the swelling can be imparted. For example, for autumn and winter clothing, it is not enough to simply provide a heat-retaining effect, and it is considered advantageous to increase the commercial value by giving a warm feeling derived from a puffy feeling (puffy warm texture). In this case, if natural fibers or recycled fibers are used in combination, a soft feeling can be imparted, which is considered to be more advantageous in increasing the commercial value. For example, wool fibers are advantageous for imparting a warm feeling, and cellulose fibers are advantageous for imparting water absorption and hygroscopicity. Therefore, it is considered that more valuable ones can be provided by using them together.

  On the other hand, in the fabric using filament yarn, for example, the fabric is raised to give a warm feeling, but the new problem of obtaining a uniform surface feeling by suppressing finger marks and thickness spots by raising the fabric. Occurs. As a result, the condition setting and management of the process becomes complicated and disadvantageous in terms of cost, and it is difficult to say that it is preferable.

  The present invention eliminates the disadvantages of the prior art of the present invention, has an excellent warming effect that is not affected by the weather, has a long lasting heat retention effect, and has a soft feeling and warm feeling, and is suitable for use in autumn and winter clothing. An object of the present invention is to provide a fabric.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has found that when a pyrogenic fine particle is used in combination with a method using a far-infrared radioactive fine particle, the amount of each fine particle used due to a synergistic effect of the far-infrared radiation action and the exothermic action. It has been found that even if the spinning operability is improved by reducing the number of yarns, the heat retention effect is not reduced, and a superior heat retention effect that is not affected by the weather can be obtained at the same time, and further, a fabric is formed using the spun yarn. Therefore, it is possible to give a warm feeling to the fabric without adjusting the raising or other thicknesses, and to specify a short fiber to be arranged in the core and sheath by using a spun yarn having a two-layer structure. Thus, it has been found that a further heat retaining effect and a texture excellent in softness can be simultaneously imparted to the fabric, and the present invention has been made.

  That is, this invention makes the following a summary.

(1) A fabric using a two-layer structure spun yarn in which a core part is a short fiber bundle A and a sheath part is a blended short fiber bundle B, and the short fiber bundle A contains far-infrared radiation fine particles Composed of short fibers A, the blended short fiber bundle B is composed of polyester short fibers B containing exothermic fine particles and at least one of natural fibers and regenerated fibers, and the blend ratio (polyester short fibers B / natural The total of the fibers and the recycled fibers) is in the range of 10/90 to 90/10, and in the two-layer structure spun yarn, the mass ratio of the core portion to the sheath portion (core portion / sheath portion) is 10 / 90-60 / 40, and a twist coefficient is in the range of 2.0-4.0.
(2) The far-infrared radioactive fine particles are at least one fine particle selected from the group consisting of mica, tin oxide and talc, and the exothermic fine particles are at least one selected from the group consisting of carbon, zirconium oxide and zirconium carbide. The heat-retaining fabric according to (1), which is a seed fine particle.
(3) The heat-retaining cloth according to (1) or (2), wherein the far-infrared radioactive fine particles and the exothermic fine particles are each contained in an amount of 0.1 to 10% by mass in each short fiber.
(4) The heat-retaining fabric according to any one of (1) to (3), wherein the thickness is 0.2 to 2.0 mm and the basis weight is in the range of 100 to 250 g / m ² .

  ADVANTAGE OF THE INVENTION According to this invention, the cloth excellent in the heat retention effect excellent in sustainability without being influenced by the weather, a soft feeling, and a warm feeling can be provided. For this reason, it is suitable for autumn and winter clothing. Since the fabric of the present invention uses spun yarn, an excellent warm feeling can be obtained without requiring any special device.

  In the spun yarn of the present invention, far-infrared radioactive fine particles and exothermic fine particles are used in combination, and both are relatively close to each other. For this reason, the synergistic effect by a far-infrared radiation effect | action and a heat_generation | fever effect is exhibited, and even if these microparticles | fine-particles are comparatively low quantity, the outstanding heat retention effect is exhibited. Furthermore, since the spun yarn in the present invention has a two-layer structure and the short fibers to be arranged in the core portion and the sheath portion are specified, the above synergistic effect is further promoted in the fabric, and a soft texture is also obtained. It is done.

  Hereinafter, the present invention will be described in detail.

  A specific spun yarn is used for the fabric of the present invention. Specifically, a short fiber bundle A composed of polyester short fibers A containing far-infrared emitting fine particles is arranged in the core, polyester short fibers B containing exothermic fine particles, and at least natural fibers and regenerated fibers. A double-layer structure spun yarn in which a blended short fiber bundle B composed of one kind is arranged in the sheath is used.

  First, as the polyester polymer constituting the short fibers A and B, any polyester polymer having fiber forming ability can be used. Examples thereof include aromatic polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, and aliphatic polyesters such as PLA (polylactic acid).

The polyester polymer may be a copolymer containing another constituent monomer as a copolymerization component in view of viscosity, thermal characteristics, compatibility, and the like. Examples of copolymer components include aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid; aliphatic dicarboxylic acids such as adipic acid, succinic acid, suberic acid, sebacic acid, and dodecanedioic acid; ethylene glycol, propylene glycol Aliphatic diols such as 1,4-butanediol and 1,4-cyclohexanedimethanol; hydroxycarboxylic acids such as glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid and hydroxyoctanoic acid Acid; aliphatic lactones such as ε-caprolactone.
The short fibers A and B may contain inorganic fine particles such as matting agents, flame retardants, and antioxidants, and organic compounds as necessary.

  As far-infrared radioactive fine particles contained in the short fiber A, any fine particles composed of a substance having far-infrared radiation can be used. 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, mica, tin oxide, and talc are preferable from the viewpoint of further improving the far-infrared radiation performance. These far-infrared radioactive fine particles may be used alone or in combination of two or more.

  Although it does not specifically limit as an average particle diameter of a far-infrared radiation fine particle, 10 micrometers or less are preferable, 0.1-5 micrometers is more preferable, 0.3-3 micrometers is further more preferable. By using far-infrared radioactive fine particles that satisfy such a range, an excellent heat retention effect can be given to the fabric. Moreover, it is preferable to reduce the fine particle diameter in order to improve the spinning operability. Here, the average particle diameter refers to a volume average particle diameter measured using a laser diffraction scattering method particle size distribution measuring apparatus.

  Although it does not specifically limit as content of a far-infrared radioactive fine particle, Generally it is preferable that 0.1-10 mass% is contained in the short fiber A, 0.2-5 mass% is more preferable, 0.5% -2.5 mass% is further more preferable, and 0.5-2 mass% is the most preferable. In this invention, even if there is little content of far-infrared radioactive fine particles, since the exothermic fine particle mentioned later is used together, there exists an advantage that there exists an outstanding heat retention effect. In the present invention, not only can the heat generated by the exothermic fine particles be used to improve the heat retaining effect itself, but the heat can also be used to increase the temperature of the far-infrared radiation fine particles. Along with this, a synergistic effect that more far infrared rays are emitted is produced. Therefore, an excellent heat retention effect can be obtained.

  On the other hand, as the exothermic fine particles contained in the short fibers B, any fine particles composed of a substance that generates heat by absorbing electromagnetic waves (including sunlight) can be used. Examples thereof include carbon, zirconium oxide, zirconium carbide and the like. Among these, carbon and zirconium carbide are preferable from the viewpoint of further improving the heat generation performance. These exothermic fine particles may be used alone or in combination of two or more.

  Although it does not specifically limit as an average particle diameter of exothermic fine particle, 0.01-5 micrometers is preferable, 0.05-3 micrometers is more preferable, 0.1-2 micrometers is further more preferable. By using exothermic fine particles satisfying such a range, an excellent heat retention effect can be given to the fabric. Moreover, it is preferable to reduce the fine particle diameter in order to improve the spinning operability. Here, the average particle diameter refers to the volume average particle diameter measured using a laser diffraction / scattering particle size distribution analyzer, as in the case of the far-infrared radioactive fine particles.

  The content of the exothermic fine particles is not particularly limited, but is generally preferably 0.1 to 10% by mass in the short fiber B. Similar to the case of the far-infrared radioactive fine particles, the exothermic fine particles have the advantage of having an excellent heat retaining effect even if the content thereof is small. From this viewpoint, the content of the fine particles is more preferably 0.2 to 5% by mass, further preferably 0.5 to 2.5% by mass, and most preferably 0.5 to 2% by mass. By reducing the amount of exothermic fine particles used, the spinning operability is also improved.

  The combination of fine particles to be contained in each short fiber in the present invention is preferably a combination of mica and carbon, or mica and zirconium carbide from the viewpoint of further exerting the above synergistic effect.

  The single yarn fineness of the short fibers A and B is preferably 0.6 to 4.4 dtex, more preferably 1.0 to 4.4 dtex, from the viewpoint of spinnability. The average fiber length is preferably 32 to 51 mm.

  The short fibers A and B can be obtained by, for example, kneading a predetermined amount of each of the fine particles in the polyester polymer, cutting the melt to a predetermined length after melt spinning.

  In the double-layer structure spun yarn of the present invention, the core portion is composed of the short fiber bundle A and the sheath portion is composed of the mixed spun fiber bundle B. Specifically, the core portion of the spun yarn is formed by a bundle of a plurality of polyester short fibers A. On the other hand, the sheath is one of a plurality of polyester short fibers B and a plurality of natural fibers, a plurality of polyester short fibers B and a plurality of regenerated fibers, and a plurality of polyester short fibers B, a plurality of natural fibers and a plurality of regenerated fibers. The fiber group by the combination of is formed into a bundle. In such a spun yarn, usually, the fiber bundle B is wound around the short fiber bundle A so that the mixed fiber bundle B surrounds the short fiber bundle A.

  Here, examples of natural fibers include cellulose fibers such as cotton and hemp; animal fibers such as wool, angora, cashmere, mohair, alpaca, and silk. On the other hand, examples of the regenerated fiber include cellulose fibers such as viscose rayon, cupra, lyocell, modal, and polynosic. In the present invention, by using natural fibers and regenerated fibers, it is possible to impart a texture with excellent soft feeling to the fabric. Among them, wool is preferably used for further improving the warm feeling together with the soft feeling, and cellulose fiber is preferably used for newly imparting water absorption and hygroscopicity. Among cellulose fibers, cotton and lyocell are particularly preferable.

  The single yarn fineness of natural fiber and regenerated fiber is preferably 0.6 to 4.2 dtex, more preferably 1.0 to 3.9 dtex, from the viewpoint of spinnability. The average fiber length is preferably 30 to 40 mm.

  In the present invention, by arranging the mixed short fiber bundle B in the sheath portion of the spun yarn, light absorption can be promoted and a soft texture can be given to the fabric. This is because the short fibers B and at least one of natural fibers and regenerated fibers are simultaneously exposed on the surface of the spun yarn. On the other hand, when the short fiber bundle B has a multiple structure, the exposure amount of the short fibers B on the surface of the spun yarn is reduced, or the exposure amounts of natural fibers and regenerated fibers are reduced. If the exposure amount of the short fiber B decreases, it becomes difficult to capture light accordingly, so that the above-described synergistic effect is difficult to be achieved, and an improvement in the heat retaining effect cannot be expected. On the other hand, if the exposure amount of natural fibers and recycled fibers is reduced, the texture cannot be improved accordingly. Further, if the short fiber bundle B is disposed on the core of the spun yarn, the exposure amount of not only the short fiber B but also natural fibers and regenerated fibers is reduced, so that neither a heat retaining effect nor an improved texture can be expected.

  In the fabric of the present invention, it is possible to simultaneously obtain a heat retaining effect and a soft texture, but in order to express these effects in a balanced manner, it is necessary to define the mixing ratio in the blended short fiber bundle B. is there. Specifically, the mixing ratio (the total of polyester short fiber B / natural fiber and regenerated fiber) needs to be in the range of 10/90 to 90/10. When the mixing ratio is out of this range, only one of the heat retaining effect and the soft feeling is strongly reflected in the fabric, which is disadvantageous for further application development.

  Moreover, as mass ratio (core part / sheath part) of the core part in a spun yarn, it needs to exist in the range of 10 / 90-60 / 40, and exists in the range of 20 / 80-40 / 60. It is preferable. In the present invention, infrared radiation fine particles and exothermic fine particles are used, and a heat retention effect is exhibited by the characteristics of the fine particles. However, the present invention is not limited to this, and both of them are included in a single spun yarn. Therefore, far infrared radiation is promoted by the heat generated by the exothermic fine particles, and thus a synergistic heat retaining effect exceeding the heat retaining effect by the sum of the individual fine particles can be achieved. Therefore, from the viewpoint of blending the infrared radiation fine particles and the exothermic fine particles in a balanced manner, it is necessary to define the mass ratio of the core portion and the sheath portion in the spun yarn as described above. In the present invention, even if out of the above range, the heat retaining effect itself is not exhibited, but only the heat retaining effect with poor sustainability that is easily affected by the weather can be obtained.

Furthermore, the twist coefficient of the spun yarn needs to be in the range of 2.0 to 4.0, and is preferably in the range of 2.5 to 3.0. The twist coefficient is calculated by the following equation: K = T / N ^1/2 (K: twist coefficient, T: number of twists (times / inch), N: thickness of the obtained spun yarn (English cotton count)) It is what is done. When the twist coefficient is less than 2.0, the short fibers constituting the spun yarn are not sufficiently converged, and only a spun yarn having inferior tensile strength can be obtained. Such spun yarn not only hinders weaving and knitting, but also does not provide the strength required for clothing. On the other hand, if the ratio exceeds 4.0, the short fibers are excessively focused, and a fabric excellent in soft feeling and warm feeling cannot be obtained. Further, the yarn may be broken during the spinning, which is not preferable in terms of the work process.

  The fluff index of the spun yarn is not particularly limited. For example, if the compact spin spinning method is used for the purpose of reducing the fluff, the strength of the spun yarn can be increased, and the fabric can be given a glossy feeling.

  Further, the spun yarn may contain other short fibers as long as the effects of the present invention are not impaired. Usually, the core part preferably contains 80 parts by mass or more of the short fibers A, and the sheath part contains 80 parts by mass or more of the short fibers B, natural fibers and regenerated fibers in total. Is preferred.

  Next, a method for obtaining the spun yarn in the present invention will be described.

  In order to obtain the spun yarn in the present invention, for example, a sliver A composed of the short fibers A and a mixed sliver B composed of the short fibers B and at least one of natural fibers and recycled fibers are prepared. , Sliver is spun while the sliver A is placed on the core and the mixed sliver B is placed on the sheath, and the resulting composite roving is finely spun, or the sliver A and B are separately roasted separately, and then the sliver A And the like, and the like, and the like. The blended sliver B can be obtained, for example, by mixing fibers in a blended cotton or kneaded process during the spinning process.

  In the present invention, it is preferable to employ the former method from the viewpoint of obtaining a spun yarn having excellent coverage.

  In the former method, in order to wind the sliver B around the sliver A, the sliver A may be introduced into the outside of the draft area as viewed from the fryer head of the roving machine, and the sliver B may be introduced into the inside to perform the roving. Further, during the roving process, B may be sequentially wound around A by setting the delivery amount of sliver B higher than the delivery amount of sliver A.

  On the other hand, in the latter method, the feed amount is adjusted so that the amount of the roving yarn B spun from the front roller of the spinning machine is larger than the amount of the roving yarn A, and after spinning, the two are overlapped, and the ring, traveler Just give a real twist.

  In both methods, for the purpose of improving the covering property of the spun yarn, a plurality of B may be used and wound around A, or after spinning, a plurality of spun yarns may be twisted as necessary. May be. In the former method, the composite roving may be finely spun and twisted.

  The fabric of the present invention is formed using the above two-layer structure spun yarn. In the present invention, sufficient warmth can be realized by efficiently converting sunlight into heat with exothermic fine particles, and at the same time, warmth can be achieved with far-infrared radioactive fine particles even in places where it is difficult to reach sunlight, such as in rainy weather or indoors. Can be maintained. For this reason, in the present invention, a desired heat retaining effect can be obtained without increasing the thickness of the fabric. Therefore, the fabric of the present invention can be preferably applied to many uses.

Specifically, the thickness of the fabric is preferably in the range of 0.2 to 2.0 mm, and the basis weight is preferably in the range of 100 to 250 g / m ² . When the thickness of the fabric is less than 0.2 mm or the basis weight is less than 100 g / m ² , the absolute amount of the spun yarn is reduced, it is difficult to obtain a desired heat retaining effect, and a feeling of warmness is obtained by reducing the feeling of swelling. It becomes difficult to be. On the other hand, when the thickness of the fabric exceeds 2.0 mm or the basis weight exceeds 250 g / m ² , the fabric becomes heavy and difficult to apply to clothing.

  The thickness of the fabric is measured based on JIS L10968.5.1, and the basis weight is measured based on JIS L10968.8.4.

  The fabric of the present invention may contain other yarns other than the spun yarn as long as the effects of the present invention are not impaired. The fabric of the present invention preferably contains 60 parts by mass or more of the spun yarn from the viewpoint of a heat retaining effect.

  Examples of the shape of the fabric include woven fabric, knitted fabric, and non-woven fabric. In particular, when the shape is a woven fabric or a knitted fabric, the structure is not particularly limited, and an appropriate structure may be adopted depending on the purpose. Also, the design of the fabric is not particularly limited, and it may be designed so that the finishing thickness and basis weight preferably satisfy the above ranges.

  The fabric of the present invention can be obtained by scouring, relaxing, and final setting after weaving and knitting. During or after the series of post-processing, the fabric may be dyed, colored, embossed, water-repellent, antibacterial, phosphorescent, deodorized, and the like based on known knowledge. Generally, it is preferable to dye after relaxing.

  The use of the knitted or knitted fabric of the present invention is not particularly limited. It is suitably used as a material for various textile products that require 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) Far-infrared radiation The far-infrared radiation intensity of the woven fabric obtained in each Example and Comparative Example was measured. The measurement was performed using an infrared spectrophotometer FT-IR apparatus (“Spectrum GX FT-IR (trade name)” manufactured by PerkinElmer) 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 (%). In addition, as a blank, except that it does not contain far-infrared radioactive fine particles and exothermic fine particles, weaving using post-processed woven fabrics using fibers of the same composition as each Example and Comparative Example, the average emissivity (% ) And far-infrared radiation was computed based on following Formula.
<Calculation formula of far-infrared radiation>
Far-infrared radiation = [(average emissivity of the resulting fabric (%) − average emissivity of blank (%)) / average emissivity of blank (%)] × 100

(2) Heat generation characteristics In a room of constant temperature and humidity maintained at 20 ° C. and humidity of 65%, the fabric obtained in each of the examples and comparative examples was irradiated with light having an illuminance of 10,000 LUX from the reflex lamp, and the back surface The surface temperature of the fabric was observed by thermography (infrared sensor, “JTG-4200 (trade name)” manufactured by JEOL Ltd.).

(3) Soft feeling The fabric obtained by 10 panelists was subjected to a sensory test (handling) and evaluated in the following three stages.
○: Eight or more people judged to have excellent softness.
Δ: There are 5 or more and 7 or less people judged to have excellent soft feeling.
X: Less than 4 persons judged to be excellent in soft feeling.

(4) Warm feeling The fabric obtained by 10 panelists was subjected to a sensory test (handling) and evaluated in the following three stages.
○: Eight or more people judged to have excellent warm feeling.
Δ: 5 or more and 7 or less people judged to have excellent warm feeling.
X: Less than 4 persons judged to be excellent in warm feeling.

(Example 1)
A sliver A comprising polyester short fibers A having a single yarn fineness of 1.7 dtex and an average fiber length of 38 mm and containing 1.5% by mass of mica having an average particle diameter of 3 μm as far-infrared radiation fine particles was prepared. Furthermore, a polyester short fiber B having a single yarn fineness of 1.3 dtex and an average fiber length of 38 mm and containing 2.0% by mass of zirconium carbide having an average particle diameter of 1.5 μm as heat-generating fine particles, and a single yarn fineness of A blended sliver B composed of lyocell short fibers having an average fiber length of 34 mm at 0.9 dtex was prepared. This blended sliver was obtained by mixing the short fiber B and the lyocell short fiber in a drawing step, and the mixing ratio (short fiber B / lyocell short fiber) was 30/70.

  Then, both slivers were introduced into the roving machine, and the sliver was placed outside the draft area and the sliver B was placed inside the draft area as viewed from the flyer head, and the sliver B was wound around the sliver A, and combined. A roving yarn was obtained. Subsequently, the obtained composite roving was finely spun to obtain a double-layered spun yarn having a twist coefficient of 3.6 and a thickness of 40 (English cotton count). In this spun yarn, the mass ratio of the core part to the sheath part (core part / sheath part) was 30/70.

Next, using the obtained spun yarn as a warp and weft, an air jet loom (“ZA209i (trade name)” manufactured by Tsuda Koma Kogyo Co., Ltd.) was used to weave a 2/2 twill textured machine. Thereafter, the raw machine was sequentially scoured, relaxed, dyed, and finally set to obtain a heat-retaining fabric having a thickness of 0.3 mm, a basis weight of 127 g / m ² and a weft density of 118 × 80 yarns / inch.

(Comparative Example 1)
A heat-retaining fabric was obtained in the same manner as in Example 1 except that a sliver B consisting of only polyester short fibers B was used.

(Comparative Examples 2 and 3)
Except for adjusting the thickness of the sliver A and B and the draft ratio during roving so that the mass ratio of the core portion to the sheath portion in the spun yarn is as shown in Table 1, it is carried out in the same manner as in Example 1. A heat-retaining fabric was obtained.

(Comparative Examples 4 and 5)
A heat-retaining fabric was obtained in the same manner as in Example 1 except that the number of twists during spinning was adjusted so that the twist coefficient of the spun yarn was as shown in Table 1.

(Example 2)
A heat-retaining fabric was obtained in the same manner as in Example 1 except that 2.0% by mass of carbon having an average particle size of 1.5 μm was contained instead of zirconium carbide.

(Example 3)
A heat insulating fabric was obtained in the same manner as in Example 1 except that 1.5% by mass of tin oxide having an average particle diameter of 3 μm was contained instead of mica.

Example 4
Except for adjusting the draft rate at the time of spinning so that the thickness of the spun yarn is 60, and changing the fabric design by changing the raw tissue structure to a plain structure, the same as in Example 2. Thus, a heat insulating fabric having a thickness of 0.2 mm, a basis weight of 89 g / m ² and a warp / weft density of 132 × 98 yarns / inch was obtained.

(Comparative Example 6)
During roving, the sliver B and the sliver A are arranged on the outside and the inside of the draft area as viewed from the flyer head, so that the short fiber B and the lyocell short fiber are arranged on the core and the short fiber A is arranged on the sheath A heat insulating fabric was obtained in the same manner as in Example 2 except that the spun yarn with the two-layer structure was made.

  The evaluation results of the fabric obtained above are shown in Table 1.

  In the fabrics according to Examples 1 to 3, in addition to the heat generated by the individual fine particles and the far infrared radiation, the far infrared radiation was further promoted by the heat generated by the exothermic fine particles, so that an excellent heat retaining effect was obtained. Among them, the fabric according to Example 2 was more excellent in the heat retention effect than the fabrics according to Examples 1 and 3 because the synergistic heat retention effect between the fine particles was further exhibited. Moreover, as for the fabric concerning Examples 1-3, all were excellent in the soft feeling. Furthermore, it was confirmed that these were all suitable for autumn / winter clothing.

  On the other hand, in the fabric according to Comparative Example 1, neither the natural fiber nor the regenerated fiber was arranged in the spun yarn sheath portion, so that the soft feeling was lacking compared with the fabric according to Example 1.

  In the fabrics according to Comparative Examples 2 and 3, since the mass ratio of the core portion and the sheath portion in the spun yarn lacks balance, and the mass ratio of both fine particles also lacks balance, the heat generation and infrared radiation characteristics In this respect, the heat-retaining effect as balanced as the fabric according to Example 1 was not obtained. That is, in terms of the heat retaining effect, the sustainability is less likely to be affected by the weather than the fabric of Example 1.

  In Comparative Example 4, since the twist coefficient of the spun yarn was too low, a spun yarn having a predetermined strength could not be obtained, and many yarn breaks occurred during weaving. Therefore, weaving was stopped halfway. On the other hand, in Comparative Example 5, since the twist coefficient of the spun yarn was too high, a fabric excellent in soft feeling and warm feeling could not be obtained.

  Moreover, in Example 4, the thickness of the fabric was not very preferable, and the warm feeling as the fabric according to Example 2 was not obtained.

In Comparative Example 6, since the polyester short fibers containing exothermic fine particles were not arranged in the spun yarn sheath portion, the heat generation effect as in the fabric according to Example 2 was not obtained. In addition, since neither a natural fiber nor a regenerated fiber was arranged in the sheath, the soft feeling was lacking.

Claims (4)

A polyester short fiber A comprising a double-layer structure spun yarn having a short fiber bundle A as a core and a mixed short fiber bundle B as a sheath, wherein the short fiber bundle A contains far-infrared radiation fine particles. The blended short fiber bundle B is composed of a polyester short fiber B containing exothermic fine particles, and at least one of natural fiber and regenerated fiber, and its mixing ratio (polyester short fiber B / natural fiber and regenerated fiber) The total ratio of the fibers is in the range of 10/90 to 90/10. Furthermore, in the double-layered spun yarn, the mass ratio of the core part to the sheath part (core part / sheath part) is 10/90 to A heat-retaining fabric characterized by being in the range of 60/40 and having a twist coefficient in the range of 2.0 to 4.0. The far infrared radiation fine particles are at least one fine particle selected from the group consisting of mica, tin oxide and talc, and the exothermic fine particles are at least one fine particle selected from the group consisting of carbon, zirconium oxide and zirconium carbide. The heat-retaining fabric according to claim 1, wherein The heat-retaining fabric according to claim 1 or 2, wherein the far-infrared radioactive fine particles and the exothermic fine particles are each contained in an amount of 0.1 to 10% by mass in each short fiber. The thickness was 0.2 to 2.0 mm, insulation fabric according to any one claims 1 to 3 weight per unit area is equal to or in the range of 100 to 250 g / ^{m 2.}