Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
  • D01D5/30—Conjugate filaments; Spinnerette packs therefor
  • D01D5/34—Core-skin structure; Spinnerette packs therefor
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F1/00—General methods for the manufacture of artificial filaments or the like
  • D01F1/02—Addition of substances to the spinning solution or to the melt
  • D01F1/04—Pigments
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F1/00—General methods for the manufacture of artificial filaments or the like
  • D01F1/02—Addition of substances to the spinning solution or to the melt
  • D01F1/10—Other agents for modifying properties
  • D01F1/106—Radiation shielding agents, e.g. absorbing, reflecting agents
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
  • D02G3/04—Blended or other yarns or threads containing components made from different materials
  • D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
  • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
  • D03D15/49—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads textured; curled; crimped
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
  • D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/22—Physical properties protective against sunlight or UV radiation

Definitions

• the present invention relates to a core-sheath composite fiber that blocks radiant heat from the sun and a woven or knitted fabric including the fiber.
• Patent Documents 1 and 2 As a fiber used for curtains and clothes for the purpose of shielding light, a fiber using a method of dispersing white pigments such as titanium oxide, talc and barium sulfate, and inorganic fine particles such as carbon black and aluminum powder in the fiber is known.
• Patent Documents 1 and 2 Further, as a fabric for white disguise on snow, an ultraviolet-reflective white fabric made of a core yarn in which a polyvinyl alcohol fiber is a sheath yarn and a synthetic fiber multifilament is a core yarn is known (Patent Document 3).
• the fiber is a core-sheath composite fiber whose sheath is a thermoplastic polymer having a melting point of 200 ° C. or higher and whose core is polypropylene containing a crystal nucleating agent (Patent Document 4).
• Patent Documents 1 and 2 must contain a large amount of inorganic fine particles in the fiber in order to sufficiently block the radiant heat from the sun. As a result, there is a problem that not only the stability of the yarn production process is deteriorated, but also the texture of the fiber and the product is remarkably impaired. Moreover, although the polyvinyl alcohol fiber of Patent Document 3 has an effect of blocking radiant heat, there is a problem that the strength of the yarn is low.
• An object of the present invention is to provide a fiber that efficiently shields or absorbs solar radiation heat, that is, infrared light without impairing the texture of the fiber, and a woven or knitted fabric using the fiber. Another object of the present invention is to improve the stability of the fiber spinning process and the passability of the false twisting process.
• the gist of the present invention is a core-sheath composite fiber having a core part and a sheath part, wherein the core-sheath composite fiber contains 1 to 3% by mass of titanium dioxide, and the core part is mainly composed of a resin having a refractive index A.
• the sheath is composed mainly of a resin having a refractive index B, and A and B satisfy the following formula (1).
• the gist of the present invention is a core-sheath composite fiber having a core part and a sheath part, wherein the core-sheath composite fiber contains 1 to 3% by mass of titanium dioxide, and the core part has thermal conductivity (W / m K)
• the gist of the present invention resides in a core-sheath composite fiber that satisfies the following formula (5). 10 ⁇ CMVR ⁇ 40 (5)
• CMVR is at 25 ° C. above the melting point of the resin having a melting point of the resin of the main component of the core portion and the sheath portion is a resin having a melting point lower MVR (cm 3/10 min).
• the gist of the present invention resides in a method for producing false twisted yarn, in which a core-sheath composite fiber satisfying the above formula (5) is false twisted under conditions satisfying the following (6) to (8).
• TL-20 ⁇ TT ⁇ (TL + 30) (6) K ⁇ 31000 (7) 0.1 cN / dtex ⁇ TE ⁇ 0.2 cN / dtex (8)
• TL is the melting point of a resin having a low melting point among the main components of the core and sheath
• TT is the false twisting temperature
• K Indicates false twisting coefficient
• TE indicates false twisting tension.
• the core-sheath conjugate fiber of the present invention blocks radiant heat from the sun without impairing the texture of the fiber. That is, the infrared light is efficiently shielded or absorbed.
• the woven or knitted fabric using the fibers efficiently shields or absorbs radiant heat from the sun, that is, infrared light when used as a curtain or clothes.
• the core-sheath composite fiber of the present invention efficiently shields or absorbs ultraviolet light and visible light.
• the woven or knitted fabric using the fibers efficiently shields or absorbs ultraviolet light and visible light when used as a curtain or clothes.
• the core-sheath conjugate fiber of the present invention has friction and melt resistance.
• the woven or knitted fabric using the fibers is used as sports clothing, the woven or knitted fabric is hardly melted even if it receives frictional heat due to sliding or falling. Moreover, the core-sheath composite fiber of the present invention is stably obtained in the spinning process, and the passability of the false twisting process of the fiber is also good.
• the core part is composed mainly of a resin having a refractive index A
• the sheath part is composed mainly of a resin having a refractive index B
• a and B satisfy the following formula (1)
• the core-sheath conjugate fiber of the present invention consists of a resin composition formed from a resin having a refractive index A with a core part as a main component, and a resin composition formed from a resin having a refractive index B as a sheath part.
• a and B must satisfy the following formula (1).
• the core-sheath composite fiber does not contain excessive titanium oxide, so that the radiant heat from the sun is blocked without impairing the texture of the fiber. That is, the infrared light is efficiently shielded or absorbed. One reason for this is considered to be that light is reflected at the core-sheath interface.
• the resin that forms the core and / or the sheath is a polyethylene resin, a nylon 6 resin, a polyester resin, a polypropylene resin, or the like.
• Tables 2 and 26 on pages 218 to 219 of the Textbook Handbook, Textile Society (issued November 30, 1968) describe the refractive index in the direction perpendicular to the fiber axis of various resin fibers as follows: ing. Polyethylene fiber 1.512 to 1.520, Polypropylene fiber 1.488, Nylon 6 fiber 1.515, Polyethylene terephthalate fiber 1.372 to 1.781
• the core part is composed mainly of a resin having thermal conductivity (W / m ⁇ K) C
• the sheath part is composed mainly of a resin having thermal conductivity (W / m ⁇ K) D
• C and D are the following formulae Satisfy (2)>
• the core part is mainly composed of a resin having thermal conductivity (W / m ⁇ K) C
• the sheath part is mainly composed of a resin having thermal conductivity (W / m ⁇ K) D.
• C and D must satisfy the following formula (2).
• the resin that forms the core and / or the sheath is a polyethylene resin, a polypropylene resin, a polyester resin, a polyvinyl chloride resin, or the like.
• Tables 1 and 28 on page 107 of the Textbook Handbook of Materials Textile Society (issued November 30, 1968) show thermal conductivity [50 -4 ⁇ cal ⁇ deg -1 ⁇ cm ⁇ 1 ⁇ sec ⁇ 1 ] is described as follows.
• the unit of the above thermal conductivity value is converted to (W / m ⁇ K)
• the following values are obtained.
• the core-sheath composite fiber contains 1 to 3% by mass of titanium dioxide>
• the core-sheath composite fiber of the present invention needs to contain 1 to 3% by mass of titanium dioxide.
• the titanium dioxide content of 3% by mass or less has an effect of blocking the radiant heat of the sun, and the thickening due to the addition of titanium dioxide is not so large, so that the yarn-making property does not occur.
• the fact that titanium dioxide is 1% by mass or more has an effect of blocking the intended solar radiation heat.
• titanium dioxide is disposed on the sheath, the yarn path guide may be worn out in a step after the yarn production. For this reason, it is preferable to distribute titanium dioxide in the core part.
• it is preferable to contain titanium dioxide in the resin of the core portion and the sheath portion because the effect of blocking the radiant heat of the sun is most obtained.
• the titanium dioxide used will not be limited if it is titanium dioxide used in manufacture of synthetic fiber etc.
• the core-sheath composite fiber preferably contains 1.4 to 2% by mass of titanium dioxide.
• the average particle diameter of the primary particles of titanium dioxide is preferably in the range of 0.1 to 1 ⁇ m, more preferably in the range of 0.1 to 0.3 ⁇ m, in consideration of stability in the spinning process. Titanium oxide that can be easily obtained is, for example, titanium dioxide ADD manufactured by Kronos.
• the core-sheath conjugate fiber of the present invention has an air permeability of 240 to 350 cm 3 / cm 2 / sec and an R value of 24 or less when formed into a woven or knitted fabric having a basis weight of 220 to 300 g / m 2. preferable.
• the R value is the temperature rise (° C.) measured by the thermal barrier test. When the R value is 24 or less, it can be used comfortably in an environment where a woven or knitted fabric is used.
• the R value is more preferably 23 or less, and even more preferably 22 or less.
• the basis weight value of 220 to 300 g / m 2 is a standard basis weight of woven or knitted fabric for clothing, and the numerical value of air permeability of 240 to 350 cm 3 / cm 2 / second is that of the above-mentioned basis weight woven or knitted fabric. Standard air permeability.
• the R value decreased as the titanium dioxide content (mass%) in the fiber decreased from 2 mass%.
• the main component of the core is a polyethylene resin
• the main component of the sheath is a polyester resin
• the volume ratio of the core and the sheath is changed
• the titanium dioxide in the fiber As the content (mass%) decreases from 2 mass%, the R value increases. As this reason, it is thought that the difference in refractive index or thermal conductivity of the resin between the core and the sheath is affected.
• the core-sheath composite fiber of the present invention preferably has an infrared transmittance of 32% or less when a woven or knitted fabric having a basis weight of 220 to 300 g / m 2 is used.
• the infrared transmittance is more preferably 30 or less, and even more preferably 27% or less.
• the infrared transmittance increases as the content (% by mass) of titanium dioxide in the fiber decreases from 2% by mass. It is preferable that the aforementioned range of R value and the range of infrared transmittance are satisfied at the same time.
• the resin composition of the core part is mainly formed from a polyolefin resin.
• the polyolefin resin that forms the core is a polyethylene resin, a polypropylene resin, or the like. Disposing a polyethylene resin having a high thermal conductivity in the core portion and a polyester resin having a lower thermal conductivity than that of the polyethylene resin in the sheath portion has a positive thermal conductivity difference and a large thermal conductivity difference. .
• the polyethylene resin used is of a known fiber grade molecular weight and density, and is not particularly limited. Examples of the polyethylene resin that can be easily obtained include Kernel KF283 and KF380 manufactured by Nippon Polyethylene.
• a polypropylene resin having a low thermal conductivity in the core portion and arranging a nylon 6 resin or the like having a higher thermal conductivity than the polypropylene resin in the sheath portion has a negative thermal conductivity difference and a large conductivity difference. . For this reason, it is considered that heat is hardly transmitted in the radial direction of the fiber, and heat is easily transmitted in the longitudinal direction of the fiber.
• the polypropylene used is of a known fiber grade molecular weight and density, and is not particularly limited. Examples of polypropylene resins that are readily available include Novatec SA01 and SA03 manufactured by Nippon Polypro.
• the core-sheath composite fiber of the present invention is subjected to false twisting as necessary in order to impart stretchability, bulkiness and the like to the woven or knitted fabric.
• the main component of the core resin composition is preferably a polyolefin resin having a melting point in the range of 130 ° C to 180 ° C.
• the melting point of the polyolefin resin being 130 ° C. or more reduces the generation of white powder in the false twisting process.
• a melting point of 180 ° C. or lower improves the friction and melt resistance of the woven or knitted fabric of the present invention.
• the resin composition of the sheath part is mainly formed from a polyester resin.
• the polyester resin forming the sheath is a known fiber grade polyethylene terephthalate, polybutylene terephthalate, or the like, but is preferably polyethylene terephthalate or copolymer polyethylene terephthalate.
• the polyethylene terephthalate is polyethylene terephthalate satisfying the following formulas (3) and (4). Satisfaction of the following formulas (3) and (4) makes it possible to dye with a cationic dye and to allow normal pressure dyeing.
• s and a are the copolymerization rate (mol%) of the sulfoisophthalic acid unit in the polyethylene terephthalate resin and the copolymerization of the aliphatic dicarboxylic acid having 2 to 8 carbon atoms, respectively. Rate (mol%).
• the metal salt of sulfoisophthalic acid is an alkali metal salt of 5-sulfoisophthalic acid (lithium salt, sodium salt, potassium salt, rubidium salt, cesium salt) or the like. If necessary, alkaline earth salts such as magnesium salts and calcium salts of these compounds are used in combination. Of these, the sodium salt of 5-sulfoisophthalic acid is most often used.
• the dyeability in atmospheric dyeing is good.
• A is 15 mol% or less, the glass transition temperature and melting point of the polyester resin are in an appropriate range.
• the aliphatic dicarboxylic acid having 2 to 8 carbon atoms include succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid and the like, and among them, adipic acid is preferable.
• the use of adipic acid causes an appropriate disturbance in the amorphous structure of the fiber and improves the dyeability.
• ⁇ Volume ratio between core and sheath is 1/2 to 1/10>
• the volume ratio of the core part to the sheath part needs to be 1/2 to 1/10. If the core-sheath volume ratio exceeds 1/2, the sheath part is broken and the core part is exposed, which lowers the stability of yarn production. When the core-sheath volume ratio is less than 1/10, the heat shielding property of the fiber is deteriorated.
• the volume ratio between the core portion and the sheath portion is preferably in the range of 1/4 to 1/8 from the viewpoints of yarn production stability and heat shielding properties.
• CMVR is the MVR of a resin having a low melting point at a temperature 25 ° C. higher than the melting point of a resin having a high melting point among the main components of the core and the sheath.
• the CMVR is preferably 10 ⁇ CMVR ⁇ 40.
• the CMVR is 10 or more, the stability when spinning the core-sheath composite fiber is improved.
• CMVR is 40 or less, white powder generated by false twisting is reduced when the melting point of the main resin of the core is lower than the melting point of the main resin of the sheath.
• white powder adheres to a spinner, a guide, etc., when false twisting.
• the generation of white powder reduces the effect of blocking the radiant heat of the sun and the performance of friction melting resistance, which are characteristics of the core-sheath composite fiber of the present invention, and also reduces the quality of the woven or knitted fabric.
• production of white powder reduces the passability of false twisting, and the process passability at the time of manufacturing a textile fabric or a knitted fabric. The reason why the CMVR is 40 or less reduces the white powder is not clear, but is presumed as follows.
• the molten sheath resin composition covers the molten core resin composition.
• the low molecular weight component of the resin as the main component of the core may rarely enter the sheath.
• the fiber is deformed, and a small amount of low molecular weight components in the sheath are exposed, resulting in white powder.
• the CMVR of 40 or less makes it difficult for the low molecular weight component of the resin as the main component of the core to enter the resin composition of the sheath.
• ⁇ Cross-sectional shape perpendicular to the fiber axis is triangular, square, hollow or Y-shaped>
• the cross-sectional shape perpendicular to the fiber axis of the core-sheath composite fiber of the present invention is preferably triangular, square, hollow, or Y-shaped. That the cross-sectional shape is triangular, square, hollow, or polygonal, such as a Y shape, increases the reflectance of sunlight and improves the effect of blocking the radiant heat of the sun. Moreover, being a hollow cross section improves the effect of blocking solar radiation heat due to the presence of an air layer with low thermal conductivity.
• the single fiber fineness of the core-sheath composite fiber of the present invention is preferably 3 dtex or less, more preferably 2 dtex or less, and even more preferably 1 dtex or less. In this case where the single fiber fineness is so small, the surface area of the fiber is increased and the reflection part of sunlight is increased, so that the effect of blocking the radiant heat of the sun is improved.
• the core-sheath conjugate fiber of the present invention is produced by a known core-sheath conjugate fiber spinning method.
• the spinning hole of the spinneret used for spinning the core-sheath composite fiber has a larger diameter than the spinning hole of the spinneret in ordinary spinning, and is preferably 0.3 to 9.5 ⁇ m.
• the drawing method after spinning may be either a method of drawing after unwinding the undrawn yarn or a method of drawing without winding up the undrawn yarn.
• the core-sheath composite fiber of the present invention is preferably a false twisted yarn.
• the false twisted yarn means that the cross-sectional shape perpendicular to the fiber axis is a polygonal cross-section, the solar light reflectance is increased, and the effect of blocking solar radiation heat is improved.
• the false twisting conditions for producing false twisted yarn comprising the core-sheath composite fiber of the present invention preferably satisfy the following formulas (6) to (8).
• TL is the melting point of a resin having a low melting point among the main components of the core and sheath
• TT is the false twisting temperature
• K Indicates false twisting coefficient
• TE indicates false twisting tension.
• the false twisting temperature is preferably 147 to 197 ° C.
• the false twist coefficient is 31000 or less in order to suppress crimped spots and thread breakage.
• the false twist tension is 0.1 cN / dtex or more in order to suppress crimped spots and thread breakage.
• false twisting tension is 0.2 cN / dtex or less, since generation
• the core-sheath conjugate fiber of the present invention is used as a constituent yarn of a woven or knitted fabric.
• the woven structure, the knitted structure, the weaving method, the knitting method, the loom, the knitting machine or the like is not particularly limited.
• the woven or knitted fabric of the present invention preferably has a basis weight of 150 to 400 g / m 2 .
• the basis weight is 150 g / m 2 or more, the effect of blocking radiant heat is easily exhibited.
• the basis weight is 400 g / m 2 or less, the thickness does not increase and it is difficult to store heat.
• the structure of the woven or knitted fabric of the present invention is not particularly limited, it is preferable that the structure is composed only of the core-sheath conjugate fiber of the present invention.
• a reversible knitted fabric is mentioned as a structure
• the reversible knitted fabric is knitted using the core-sheath composite fiber of the present invention as a front yarn or a back yarn.
• one surface of the knitted fabric is a component surface of the core-sheath composite fiber that blocks radiant heat
• the other surface is a component surface of the other fiber
• the functions or features of other fibers are added.
• the constituent surface of the core-sheath composite fiber of the reversible knitted fabric has an effect of blocking not only the radiant heat from the sun but also the radiant heat from the human body. For this reason, the clothes etc. by a reversible knitted fabric are properly used according to a season and an environment.
• the other fibers used for the other surface are, for example, natural fibers such as cotton, hemp and silk, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, and thermoplastic fibers such as polyester fibers.
• the cross-sectional shape in the direction perpendicular to the fiber axis of the single fiber constituting each fiber is not particularly limited. This cross-sectional shape is selected from cross-sectional shapes such as chrysanthemum, circular, flat and Y-shaped in consideration of the texture and gloss of the resulting woven or knitted fabric.
• the woven or knitted fabric may be a twisted yarn containing the core-sheath composite fiber of the present invention.
• the twisted yarn is obtained by twisting the core-sheath composite fiber of the present invention, by twisting the core-sheath composite fiber of the present invention, or by twisting the core-sheath composite fiber of the present invention and another fiber.
• the fact that the core-sheath composite fiber of the present invention and the other fiber are twisted imparts characteristics of the other fiber (for example, glossiness, refreshing feeling, wet feeling, etc.) to the woven or knitted fabric.
• the twist direction and the number of twists of the twisted yarn are not particularly limited, and are determined according to the target texture and appearance.
• the other fibers used for the above-mentioned twisting are, for example, natural fibers such as cotton, hemp and silk, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, and thermoplastic fibers such as polyester fibers.
• the cross-sectional shape in the direction perpendicular to the fiber axis of the single fiber constituting each fiber is not particularly limited. This cross-sectional shape is selected from cross-sectional shapes such as chrysanthemum, circular, flat and Y-shaped in consideration of the texture and gloss of the resulting woven or knitted fabric.
• R value A woven or knitted fabric of fiber was prepared and measured by the method for measuring heat shielding properties of the Japan Chemical Fiber Inspection Association, and the temperature rise 15 minutes after the start of measurement was taken as the R value.
• the heat shielding measurement method is as follows. The sample was held about 5 mm above the black drawing paper, and the lamp light was irradiated from the sample side, and the temperature at the center of the drawing paper on the back side was measured with a thermocouple over time. Lamp used: Iwasaki Electric Co., Ltd. Eye lamp (spot) PRS100V500W Irradiation distance: 50cm Irradiation time: 15 minutes Laboratory temperature: 20 ⁇ 2 ° C
• Ts was corrected using the following equation every 5 nm in the range of 250 to 2000 nm, and the corrected transmittance (%) (hereinafter referred to as T) was calculated.
• T (Ts / Tg) ⁇ 100 (5)
• the infrared region, visible light region, and ultraviolet region were defined as the following wavelength ranges. Infrared region 700-2000 nm, visible light region 400-700 nm, ultraviolet region 250-400 nm (6)
• the arithmetic average value of T was calculated for each region of (5), and the infrared transmittance (%), visible light transmittance (%), and ultraviolet transmittance (%) were obtained.
• MFR Melt flow rate
• MVR Melt volume rate
• the false twist conditions in each of the examples and comparative examples are, unless otherwise specified, the number of false twists is 3000 t / m (in the case of 84 dtex drawn yarn, the twist coefficient is 27500), and the false twist temperature is 170.
• false twisting speed is 150 m / min
• false twisting tension is 0.15 cN / dtex.
• Air permeability 20 ° C., at environmental variable chamber relative humidity 65%, JIS L 1096 breathable
• Frazier method air permeability when measured using the air permeability tester FX 3300 (TEXTEST Co.) (cm 3 / cm 2 / sec).
• Abrasion resistance It was measured by performing a rotor type friction melting test (load is 10 kg, contact pressure for 3 seconds) in accordance with JIS L1056 (Method B). As the measurement results, A was a state in which no melt mark was generated, B was a melt mark that was not cut, and C was a cut.
• Example 1 A polyethylene resin (PE) (manufactured by Nippon Polyethylene Co., Ltd., MFR 4 g / 10 min) was used as the core. PET sheathed with polyethylene terephthalate (PET) (Mitsubishi Rayon Co., Ltd., intrinsic viscosity [ ⁇ ] 0.676, melting point 256 ° C.) added with 2% by mass of titanium dioxide (anatase type, average particle diameter of primary particles 0.3 ⁇ m) The part. Spinning at a spinning temperature of 290 ° C.
• PET polyethylene terephthalate
• titanium dioxide anatase type, average particle diameter of primary particles 0.3 ⁇ m
• the obtained undrawn yarn was drawn at a drawing speed of 600 m / min, a drawing temperature of 85 ° C., a heat setting temperature of 150 ° C., and a maximum drawing ratio of 0.68 times to prepare a drawn yarn of 84 dtex 24 filaments.
• Four obtained drawn yarns were combined to obtain a fineness of about 330 dtex.
• a knitted fabric having a rib structure was prepared using a flat knitting machine of 16 gauge (main / 2.54 cm).
• Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the obtained knitted fabric.
• Example 1 a core-sheath composite fiber drawn yarn and a knitted fabric were prepared in the same manner as in Example 1 except that the core-sheath composite ratio (volume ratio) and the resin as the main component of the core were changed as shown in Table 1.
• Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the obtained knitted fabric.
• the obtained undrawn yarn was drawn at a drawing speed of 600 m / min, a drawing temperature of 85 ° C., a heat setting temperature of 150 ° C., and a maximum drawing ratio of 0.68 times to prepare a drawn yarn of 84 dtex / 24 filament.
• Four obtained drawn yarns were combined to obtain a fineness of about 330 dtex.
• a knitted fabric having a rib structure was prepared using a flat knitting machine of 16 gauge (main / 2.54 cm). Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the obtained knitted fabric.
• Comparative Examples 2 and 5 A drawn yarn and a knitted fabric were prepared in the same manner as in Comparative Example 1 except that the addition amount of titanium dioxide was changed as shown in Table 1.
• Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the obtained knitted fabric.
• Example 8 A drawn yarn of the core-sheath composite fiber of the present invention was obtained in the same manner as in Example 1 except that a drawn yarn of 33 dtex / 36 filament was prepared using a core-sheath composite spinneret having a hole diameter of 0.3 mm and a hole number of 36. Using this drawn yarn, a woven fabric having a ripple taffeta structure of warp 165 / 2.54 cm and weft 154 / 2.54 cm (cover factor value 1832) was prepared. Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the resulting fabric.
• the cover factor value is a value obtained by the following equation.
• Example 9 A drawn yarn of the core-sheath composite fiber of the present invention was obtained in the same manner as in Example 1 except that a drawn yarn of 167 dtex / 48 filament was prepared using a core-sheath composite spinneret having a hole diameter of 0.5 mm and a number of holes of 48.
• Four core-sheath composite fibers of the present invention are aligned to form a twisted yarn of 30 t / m in the S twist direction, and a plain structure of warp 27 / 2.54 cm, weft 30 / 2.54 cm (cover factor CF value 1473).
• a tarpaulin fabric for materials was created. Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the resulting fabric.
• Example 10 In the same manner as in Example 9, a drawn yarn of the core-sheath composite fiber of the present invention was obtained.
• a 22 gauge (2.54 cm) double jersey knitting machine using a processed yarn obtained by interlacing the 167 dtex / 48 filament S-direction false twist yarn and Z-direction false twist yarn of the present invention as the front yarn, A knitted fabric of 2 ⁇ 2 Kanoko blister structure was created using 1: 1 the same interlaced processed yarn as the front yarn and acrylic spun yarn 1/52 (Mitsubishi Rayon Co., Ltd.).
• Table 1 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), and air permeability of the obtained knitted fabric.
• Example 11 a core-sheath composite fiber drawn yarn and knitted fabric were prepared in the same manner as in Example 1 except that the resin as the main component of the core part was changed as shown in Table 2.
• Table 2 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), air permeability and friction melt resistance, and white powder amount in the false twisting process of the obtained knitted fabric. It was.
• Example 25 In Example 11, a drawn yarn and a knitted fabric of the core-sheath composite fiber were produced in the same manner as in Example 11 except that the cross-sectional shape perpendicular to the fiber axis was triangular.
• Table 3 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), air permeability, friction melt resistance, and white powder amount in the false twisting process of the obtained knitted fabric. It was.
• Example 26 In Example 11, a core-sheath composite fiber drawn yarn and knitted fabric were prepared in the same manner as in Example 11 except that the drawn yarn was 84 dtex48 filament. Table 3 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), air permeability, friction melt resistance, and white powder amount in the false twisting process of the obtained knitted fabric. It was.
• Example 27 In Example 11, the drawn yarn was further used as a false twisted yarn, and a knitted fabric of the false twisted yarn was prepared.
• R value infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), air permeability, friction melt resistance, spinning stability and white powder amount in false twisting process of the obtained knitted fabric It is shown in Table 3.
• Example 28 In Example 26, the drawn yarn was further used as a false twisted yarn, and a knitted fabric of the false twisted yarn was prepared.
• Table 3 shows the R value, infrared transmittance (%), visible light transmittance (%), ultraviolet transmittance (%), air permeability, friction melt resistance, and white powder amount in the false twisting process of the obtained knitted fabric. It was.
• Example 29 to 34 For the drawn yarn of Example 12, using an IVF338 false twisting machine manufactured by Ishikawa Seisakusho, the false twisting speed was 150 m / min, the false twisting tension was 0.15 cN / dtex, and the false twisting temperature and temporary twist as shown in Table 4 were used. False twisting was performed by changing the number of twists (t / m). Table 4 shows the measurement results of the amount of white powder in the false twisting process and the crimp rate of the false twisted yarn.
• Example 35 to 40 Using the IVF338 false twisting machine manufactured by Ishikawa Seisakusho, the drawn yarn of Example 16 has a false twisting speed of 150 m / min and a false twist tension of 0.15 cN / dtex. False twisting was performed by changing the number of twists (t / m). Table 4 shows the measurement results of the amount of white powder in the false twisting process and the crimp rate of the false twisted yarn.
• the core-sheath composite fiber of the present invention efficiently shields or absorbs solar radiant heat, that is, infrared light without impairing the texture of the fiber, and has good spinning process stability and false twisting process.
• the woven or knitted fabric using the core-sheath composite fiber of the present invention has excellent heat shielding properties to block radiant heat, and is not particularly limited to the field of use, and is suitable for a wide range of applications that require blocking of radiant heat. For example, it is extremely useful as a material for sports clothing, outdoor goods such as caps, tents and umbrellas, and national costumes in extreme heat areas such as the Middle East.

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