JP2020020061A - Knitted fabric - Google Patents

Abstract

To provide a knitted fabric excellent in lightness and color fastness to dyeing, having an effect of suppressing discoloration of a front surface of the knitted fabric due to sweat or the like, and further excellent in washing durability of the effect.SOLUTION: A knitted fabric comprises a polyolefin fiber and at least one fiber which has higher hydrophilicity than polyolefin, in which the polyolefin fiber is a polymer alloy fiber having a sea-island structure composed of a sea component of a polyolefin (A) and an island component of a polyester (B). The area occupancy of the polyolefin fiber in a front surface of the knitted fabric is 60% or more and 100% or less, and the area occupancy of the polyolefin fiber in a back surface of the knitted fabric is 0% or more and 40% or less.SELECTED DRAWING: None

Description

  TECHNICAL FIELD The present invention relates to a knitted fabric which is excellent in lightness and color fastness, has an effect of suppressing stains on the knitted fabric due to sweat and the like, and further has excellent washing durability.

  Since the knitted fabric has excellent breathability and stretchability, it is suitably used as a material of clothing products, and is also preferably used for applications such as innerwear and sportswear that come into contact with the skin. However, when used for applications that come into contact with the skin, the knitted fabric gets wet due to sweating, and the color of the front surface of the knitted fabric becomes darker and stains, worsening aesthetics and psychological discomfort There is a problem that you feel. As a method of simply solving the above-mentioned stain, there is a method of applying a water repellent to only the front surface of the knitted fabric. However, the application of the water repellent has a problem that the knitted fabric tends to be hardened and the performance is deteriorated due to wear during washing and wearing.

  As an alternative to applying a water repellent, a knitted fabric may be composed of a hydrophobic fiber. In Patent Literature 1, a core is made of a polypropylene resin, and a core is provided with a disperse dye-dyeable resin in the core. A polypropylene-based fiber having dyeability by a sheath composite fiber has been proposed.

  Also, a method of cross-knitting a hydrophobic fiber and a hydrophilic fiber has been proposed. For example, Patent Document 2 discloses that a polypropylene multifilament is arranged on one surface of a knitted fabric, thereby allowing water to flow on the front surface of the knitted fabric. Localization methods have been proposed. Further, Patent Document 3 proposes a method for preventing spots by using water-repellent polyester fibers on the front surface of the knitted fabric and using hydrophilic fibers on the back surface of the knitted fabric.

  Further, when used for clothing, further weight reduction is required especially for innerwear and sportswear.

JP 2008-261070 A JP 2006-161182 A JP 2015-86489 A

  However, in Patent Document 1, when a knitted fabric is constituted only by the core-sheath composite yarn, the lightness is good, but sweat cannot be localized on the skin surface, so that sufficient stains cannot be suppressed. Also, even when mixed and knitted with other fibers, there is a problem that the back surface of the knitted fabric darkened by sweat is visible because the composite interface is less due to the core-in-sheath shape and the reflection at the interface is less and the anti-transparency is poor. is there.

  In the method of Patent Document 2, the weight of the knitted fabric is reduced as in Patent Document 1, but since the sweat is actively discharged to the front surface of the knitted fabric, the front surface of the knitted fabric becomes darker and stains. Would. Further, even if the polypropylene multifilament is simply arranged on the front surface of the knitted fabric, since the dyeing properties and reflection characteristics of the polypropylene multifilament are not taken into consideration, the back surface of the darkened knitted fabric is transparent, and sufficient stains are obtained. There is a problem that prevention cannot be obtained.

  Further, in the method of Patent Document 3, sweat can be localized on the skin surface by using a water-repellent polyester fiber, but the durability is reduced because the water-repellent drops off due to wear during washing and wearing. It is a problem. Further, since polyester fiber is used, lightness cannot be obtained.

  An object of the present invention is to solve the above-mentioned problems of the prior art, to have excellent lightness and color fastness, to have an effect of suppressing discoloration of the knitted fabric front surface due to sweat or the like, and to further exert the effect of washing durability. An object of the present invention is to provide a knitted fabric having excellent properties.

  The object of the present invention is a polymer alloy fiber comprising a polyolefin fiber and at least one hydrophilic fiber, wherein the polyolefin fiber has a sea-island structure in which polyolefin (A) is a sea component and polyester (B) is an island component. The problem can be solved by a knitted fabric in which the area occupancy of the polyolefin fiber on the front surface of the knitted fabric is 60% or more and 100% or less, and the area occupancy on the back surface of the knitted fabric is 0% or more and 40% or less. .

  Further, the crimp rate of the polyolefin fiber is preferably 10% or more.

  Further, the polyolefin fiber preferably has an elongation of 10 to 80%, and the orientation parameter of the polyester (B) in the polyolefin fiber determined by Raman spectroscopy is 1.0 to 10.0. It is preferable that the crystallinity of the polyester (B) is 1 to 40%.

  According to the present invention, it is possible to provide a knitted fabric which is excellent in lightness and dyeing fastness, has an effect of suppressing discoloration of the knitted fabric front surface due to sweat and the like, and further has excellent washing durability of the effect. it can. The knitted fabric obtained by the present invention can be suitably used for materials for clothing and a wide range of applications requiring lightness and color development.

  The knitted fabric of the present invention comprises a polyolefin fiber and at least one or more fibers having a higher hydrophilicity than the polyolefin, wherein the polyolefin fiber has a polyolefin (A) as a sea component and a polyester (B) as an island component. A polymer alloy fiber having a structure, wherein the area occupancy of the polyolefin fiber on the front surface of the knitted fabric is 60% or more and 100% or less, and the area occupancy on the back surface of the knitted fabric is 0% or more and 40% or less.

  The present inventors have conducted intensive studies to achieve the problems of the conventional knitted fabric, such as compatibility between light weight and stain prevention, and as a result, localized the polyolefin fibers on the front surface of the knitted fabric, and knitted. By localizing highly hydrophilic fibers on the ground surface, the weight of the knitted fabric was reduced, and sweat from the skin surface was prevented from seeping out to the front surface of the knitted fabric. Further, since the polyolefin fiber is a polymer alloy fiber having a sea-island structure in which the polyolefin (A) is a sea component and the polyester (B) is an island component, dyeability is obtained, and the polyolefin (A) and the polyester (B) are obtained. Because of the high refractive index difference, scattering occurs due to the difference in refractive index, and even when undyed, the knitted fabric has particularly high anti-stain properties.

  In the knitted fabric of the present invention, the area occupancy of the polyolefin fiber on the front surface of the knitted fabric is preferably from 60% to 100%, and the area occupancy on the back surface of the knitted fabric is preferably from 0% to 40%. The area occupancy in the present invention is represented by the method described in the section of Examples. If the area occupancy of the polyolefin fiber on the front surface of the knitted fabric is 60% or more and the area occupancy of the polyolefin fiber on the back surface of the knitted fabric is 40% or less, sweat generated from the skin is unevenly distributed on the back surface of the knitted fabric. Even if the back surface of the knitted fabric is wet and discolored by sweat, discoloration of the front surface is suppressed, so that stain resistance can be obtained. The area occupancy of the polyolefin fibers on the front surface of the knitted fabric is more preferably 75% or more, and further preferably 85% or more. Further, the area occupancy of the polyolefin fiber on the back surface of the knitted fabric is more preferably 30% or less, and still more preferably 15% or less.

  The mixing ratio of the polyolefin fiber in the knitted fabric of the present invention is preferably 25 wt% or more in order to sufficiently dispose the polyolefin fiber on the front surface of the knitted fabric. On the other hand, if the mixing ratio of the polyolefin fiber is too high, the sweat on the skin surface cannot be sufficiently absorbed, and the polyolefin fiber also seeps out. Therefore, the mixing ratio of the polyolefin fiber is preferably 80% by weight or less. The mixing ratio of the polyolefin fiber in the present invention indicates the percentage by weight of the polyolefin fiber in the weight of the knitted fabric.

  The knitted fabric of the present invention preferably has a front-to-back diffusion area ratio of 3.0 or more. The front and back diffusion area ratio of the present invention is shown by the method described in the section of Examples. The front-back diffusion area ratio can be adjusted by the degree of hydrophobicity and hydrophilicity of the fiber used for the knitted fabric and the structure of the knitted fabric. If the front and back diffusion area ratio is 3.0 or more, moisture such as sweat can be unevenly distributed on one surface of the knitted fabric, and the stain prevention property is improved. The front and back diffusion area ratio is more preferably 5.0 or more.

  The knitted fabric of the present invention preferably has a sheer resistance of 70% or more. The sheer-proofing property of the present invention is shown by the method described in the section of Examples. If the knitted fabric has a sheer-proofing property of 70% or more, the color of the darkened surface due to the absorption of sweat or the like is difficult to be transmitted to the front surface, so that good stain prevention properties can be obtained. More preferably, the sheer resistance is 80% or more. The upper limit of the see-through resistance in the present invention is 100% in the evaluation method.

  The knitting method of the knitted fabric of the present invention is not particularly limited, and a known method such as a flat knitting, a circular knitting, and a warp knitting can be appropriately selected depending on the application and required characteristics.

  The structure of the knitted fabric of the present invention is not particularly limited, and can be appropriately selected depending on the application and required characteristics. In the flat knitting and the circular knitting, a flat knit, a rubber knit, a pearl knit, and a changed structure obtained by appropriately combining these can be appropriately selected. Specific examples of change organization include Kanoko, One-sided, Double-sided, Needleless, Double-sided, Swing, Transparent, Floating, Supplementary thread, Pile, Milan rib, Double picket, Eight rock, Three Examples include, but are not limited to, step double-sided knitting, smooth, mock royal, cardigan knitting, and weft knitting. In addition, specific examples of warp knitting organizations include basic tissues such as single denby, single bandike, tassel, idle swing, blind wrap, second stitch, knock-off, plain tricot, atlas, double barcode, and half barcode. Examples include, but are not limited to, tricot, satin back, reverse half, sharkskin, spell knitting, bleats, pseudo pearl knitting, and the like.

The basis weight of the knitted fabric in the present invention is preferably 30 g / m ² or more, and more preferably 80 g / m ² or more in order to maintain the strength of the knitted fabric. The basis weight of the present invention is the weight per knitted fabric 1m ^2. If the basis weight is too large, the weight is felt when the knitted fabric of the present invention is worn, so that the weight is preferably 800 g / m ² or less, more preferably 500 g / m ² or less.

  The knitted fabric of the present invention may be subjected to post-processing for the purpose of improving functions and aesthetics as long as the effects of the present invention are not affected. Specific examples of post-processing include brushing, calendering, wrinkling, mercerizing, hair-burning, sanforizing, embossing, antibacterial, deodorizing, flexible, fluorescent whitening, and UV cutting. But not limited thereto.

  The polyolefin fiber in the present invention is a fiber containing 50% by weight or more of polyolefin in the fiber. By containing the polyolefin in an amount of 50 wt% or more, the hydrophobicity and lightness of the polyolefin are exhibited. Further, the polyolefin fiber in the present invention is a polymer alloy fiber.

  The polymer alloy fiber in the present invention is a fiber in which island components are discontinuously dispersed. Here, the discontinuous island component means that the island component has an appropriate length in the longitudinal direction of the fiber, and the length is several tens nm to several hundred thousand nm. At an arbitrary interval, the shape of the sea-island structure in a cross section perpendicular to the fiber axis, that is, a cross section of the fiber is different. The discontinuity of the island component in the present invention can be confirmed by the method described in the section of Examples. When the island components are discontinuously dispersed, the island components are spindle-shaped, and when dyed, the coloring efficiency by the light transmitted to the island components is improved, the sharpness is improved, and the color is deeper. Is obtained. As described above, the polymer alloy fiber of the present invention is a core-sheath composite fiber in which one island component is continuous in the fiber axis direction and the structure in the fiber cross section is formed in the same shape, or a plurality of islands are continuous in the fiber axis direction. This is essentially different from the sea-island composite fiber in which the structure in the fiber cross section is formed in the same shape. Such a polymer alloy fiber can be obtained, for example, by molding a polymer alloy composition formed by kneading the polyolefin (A) and the polyester (B) at an arbitrary stage before melt spinning is completed.

  The dispersion diameter of the island component of the polyester (B) in the fiber cross section of the polyolefin fiber of the present invention is 1 to 1000 nm. In the present invention, the dispersion diameter of the island component in the fiber cross section refers to a value measured by the method described in the section of Examples. The dispersion diameter of the island component in the fiber cross section is preferably as small as possible from the viewpoints of spinning properties, processability, mechanical properties, abrasion resistance, etc., but a polymer alloy fiber of a polyolefin (A) and a polyester (B) having low compatibility is preferred. In the above, 1 nm is the lower limit as a range that can be manufactured. On the other hand, if the dispersion diameter of the island component in the fiber cross section of the polymer alloy fiber is 1,000 nm or less, the specific interfacial area of the sea-island interface can be increased, so that interface delamination and abrasion caused by this can be suppressed. In addition to being excellent in mechanical properties and abrasion resistance, it is possible to suppress a decrease in coloring property due to an increase in scattered light due to interfacial peeling when dyed. Furthermore, in the case of undyed, appropriate scattering occurs due to a difference in the refractive index of the polymer at the sea-island interface. The dispersion diameter of the island component in the fiber cross section of the polyolefin fiber is preferably 500 nm or less, and more preferably 300 nm or less.

  Examples of the polyolefin (A) in the present invention include, but are not limited to, polyethylene, polypropylene, polybutene-1, and polymethylpentene. Among them, polypropylene is preferable because of good molding processability and excellent mechanical properties, and polymethylpentene is preferable because it has a high melting point and excellent heat resistance, has the lowest specific gravity among polyolefins, and is excellent in light weight. . For clothing use, polypropylene can be particularly preferably employed.

  The polyolefin (A) of the present invention may be a homopolymer or a copolymer with another α-olefin. Other α-olefins (hereinafter may be simply referred to as α-olefins) may be copolymerized by one kind or two or more kinds.

  The α-olefin preferably has 2 to 20 carbon atoms, and the molecular chain of the α-olefin may be linear or branched. Specific examples of the α-olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, Examples include, but are not limited to, eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 3-ethyl-1-hexene, and the like.

  The α-olefin copolymerization rate is preferably 20 mol% or less. If the copolymerization ratio of the α-olefin is 20 mol% or less, a polyolefin fiber having good mechanical properties and heat resistance can be obtained, which is preferable. More preferably, the copolymerization ratio of the α-olefin is 10 mol% or less.

  The main constituent components of the polyester (B) of the present invention are a dicarboxylic acid component (B1) and a diol component (B2), and include an aliphatic dicarboxylic acid (B1-1), an alicyclic dicarboxylic acid (B1-2), and an aromatic compound. It is preferably at least one dicarboxylic acid component (B1) selected from aliphatic dicarboxylic acids (B1-3), and aliphatic diols (B2-1), alicyclic diols (B2-2), and aromatic diols ( It is preferably at least one diol component (B2) selected from B2-3). Alternatively, the main component of the polyester (B) of the present invention is preferably any one selected from aliphatic oxycarboxylic acids, alicyclic oxycarboxylic acids, and aromatic oxycarboxylic acids.

  Specific examples of the aliphatic dicarboxylic acid (B1-1) in the present invention include malonic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, sebacic acid, 1,11-undecanedicarboxylic acid, Specific examples of alicyclic dicarboxylic acids (B1-2) such as 1,12-dodecanedicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid, and dimer acid include 1,2-cyclohexanedicarboxylic acid, Specific examples of aromatic dicarboxylic acids (B1-3) such as 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and decalin-2,6-dicarboxylic acid include terephthalic acid, phthalic acid, isophthalic acid, and the like. -Sodium sulfoisophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenediene Carboxylic acid, 2,2'-biphenyl dicarboxylic acid, 3,3'-biphenyl dicarboxylic acid, 4,4'-biphenyl dicarboxylic acid, anthracene dicarboxylic acid include, but are not limited to. Specific examples of the aliphatic diol (B2-1) include alicyclic diols (B2-) such as ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, and neopentyl glycol. As specific examples of 2), specific examples of aromatic diols (B2-3) such as 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, spiroglycol, and isosorbide include Examples include, but are not limited to, catechol, naphthalene diol, bisphenol, and the like. Furthermore, specific examples of aliphatic oxycarboxylic acids include lactic acid, glycolic acid, α-oxyisobutyric acid, β-oxyisobutyric acid, and oxypivalic acid. Specific examples of aromatic oxycarboxylic acids include salicylic acid, m-oxybenzoic acid, and p-hydroxybenzoic acid. -Oxybenzoic acid, mandelic acid, atrolactic acid and the like, but are not limited thereto.

  As specific examples of the polyester (B) of the present invention, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polyethylene naphthalate, polyethylene adipate, polypropylene adipate, polybutylene adipate, polyethylene succinate, polypropylene succinate, poly Examples include, but are not limited to, butylene succinate, polyethylene sebacate, polypropylene sebacate, polybutylene sebacate, polycaprolactone, polylactic acid, polyglycolic acid, and the like.

  The polyester (B) of the present invention is also preferably a copolymerized polyester. The refractive index of the polyester (B) in the polyolefin fiber and the molecular orientation and crystallinity of the polyester (B) in the polyolefin fiber described later can be controlled by the type of the copolymerization component and the copolymerization ratio of the copolymerization component. It is preferable because a fiber and a fiber structure excellent in coloring property and color fastness can be obtained. Specific examples of the copolymer component include the aliphatic dicarboxylic acids (B1-1), alicyclic dicarboxylic acids (B1-2), aromatic dicarboxylic acids (B1-3), and aliphatic diols (B2-1) shown above. ), An alicyclic diol (B2-2), an aromatic diol (B2-3), an aliphatic oxycarboxylic acid, an alicyclic oxycarboxylic acid, an aromatic oxycarboxylic acid, and the like, but are not limited thereto. One of these copolymer components may be used alone, or two or more thereof may be used in combination. Further, the copolymerization ratio of the copolymer component is not particularly limited, and can be appropriately selected according to the color developing property and the color fastness of the obtained polyolefin fiber.

  The polyester (B) of the present invention preferably has a refractive index of 1.40 to 1.58. The refractive index in the present invention refers to a value measured by the method described in the section of Examples. If the refractive index of the polyester (B) is 1.40 or more, the light-shielding property is improved by light scattering due to the difference in the refractive index from the polyolefin (A). Can be kept high. The refractive index of the polyester (B) of the present invention is more preferably 1.50 to 1.57.

  In the polyolefin fiber of the present invention, the melt viscosity ratio (ηB / ηA) of the melt viscosity (ηA) of the polyolefin (A) as the sea component to the melt viscosity (ηB) of the polyester (B) as the island component is 0.1. It is preferably from 2 to 5.0. The melt viscosity ratio (ηB / ηA) in the present invention refers to a value measured by the method described in Examples. In the case where different polymers are mixed and melt-spinned as in the spinning of a polymer alloy, the spinning stress applied to each of the sea component and the island component during melt spinning changes according to the melt viscosity ratio of the sea component and the island component. Therefore, the molecular orientation of the polyester (B) in the polyolefin fiber described later also changes according to the melt viscosity ratio between the sea component and the island component. In the polyolefin fiber of the present invention, the polyester (B) forms islands, and the color development and the color fastness of the fiber can be controlled according to the degree of molecular orientation of the polyester (B). Therefore, the melt viscosity ratio between the sea component and the island component is important in the present invention. If ηB / ηA is 0.2 or more, although the spinning stress applied to the polyester (B) during melt spinning is reduced, the molecular orientation of the polyester (B) in the polyolefin fiber is not too low, so that the polyolefin fiber is dyed. It is preferable because the dropout of the dye from the polyester (B) in the subsequent reduction washing or soaping is suppressed, and a fiber and a fiber structure excellent in color developability and levelness can be obtained. In addition, it is preferable because the removal of the dye is suppressed even during friction and washing during use, and a fiber structure excellent in color fastness can be obtained. ηB / ηA is more preferably 0.3 or more, further preferably 0.5 or more, and particularly preferably 0.7 or more. On the other hand, if ηB / ηA is 5.0 or less, the spinning stress applied to the island component polyester (B) during melt spinning does not become too high, and the molecular orientation of the polyester (B) in the polyolefin fiber is suppressed. Therefore, the dye is sufficiently dyed, and it is possible to obtain a fiber and a fibrous structure having excellent coloring properties. ηB / ηA is more preferably 3.3 or less, further preferably 2.0 or less, and particularly preferably 1.4 or less.

  In the present invention, as described above, the molecular orientation and crystallinity of the polyester (B) in the polyolefin fiber can be controlled by the type of the copolymer component of the polyester (B) and the copolymerization ratio of the copolymer component. . Therefore, depending on the type of the copolymer component of the polyester (B) and the copolymerization ratio of the copolymer component, the melt viscosity (ηA) of the polyolefin (A) as the sea component and the melt viscosity of the polyester (B) as the island component are determined. The preferred range of the melt viscosity ratio (ηB / ηA) to the viscosity (ηB) changes. For example, in the case of polyethylene terephthalate, it is preferably from 0.2 to 0.9, and more preferably from 0.4 to 0.7. In the case of polyethylene terephthalate obtained by copolymerizing 30% by mole of isophthalic acid (IPA), ηB / ηA is preferably from 0.2 to 5.0, and more preferably from 0.5 to 2.0.

  The polyolefin fiber of the present invention preferably contains 3.0 to 30.0 parts by weight of the polyester (B) based on 100 parts by weight of the total of the polyolefin (A) and the polyester (B). When the content of the polyester (B) is 3.0 parts by weight or more, the polyester (B) is dispersed in the polyolefin (A), and a fibrous structure provided with vivid and deep color development is provided. It is preferable because it can be obtained. In addition, since the spinning stress applied to the polyester (B) during melt spinning does not become too high, the molecular orientation of the polyester (B) in the polyolefin fiber described later can be suppressed. Since the molecular orientation of the polyester (B) is suppressed in the polyolefin fiber, the dye is sufficiently dyed, and a fiber structure excellent in coloring property is preferably obtained. On the other hand, when the content of the polyester (B) is 30.0 parts by weight or less, the spinning stress applied to the polyester (B) as an island component during melt spinning is reduced, but the molecular orientation of the polyester (B) in the polyolefin fiber is reduced. Is not too low, so that in the reduction washing or soaping after dyeing the polyolefin fiber, the falling off of the dye from the polyester (B) is suppressed, and it is possible to obtain a fibrous structure excellent in coloring property and level dyeing property. It is preferable because it is possible. In addition, it is preferable because the removal of the dye is suppressed even during friction and washing during use, and a fiber structure excellent in color fastness can be obtained. The content of the polyester (B) is further preferably 25.0 parts by weight or less, more preferably 20.0 parts by weight or less.

  The polyolefin fiber of the present invention may have been subjected to various modifications by adding additives. Specific examples of additives include compatibilizers, plasticizers, antioxidants, ultraviolet absorbers, infrared absorbers, fluorescent brighteners, mold release agents, antibacterial agents, nucleating agents, heat stabilizers, antistatic agents, Examples include, but are not limited to, color inhibitors, conditioners, matting agents, defoamers, preservatives, gelling agents, latex, fillers, inks, colorants, dyes, pigments, fragrances, and the like. These additives may be used alone or in combination of two or more.

  The polyolefin fiber of the present invention is not particularly limited with respect to the form of the fiber, and may be in any form such as a drawn yarn, a spun yarn, an air-processed yarn, a false twisted yarn, a twisted yarn, and a covering yarn. It is preferable that the multifilament is composed of

  The fineness of the polyolefin fiber of the present invention as a multifilament is not particularly limited and may be appropriately selected depending on the application and required characteristics, but is preferably from 10 to 500 dtex. The fineness in the present invention refers to a value measured by the method described in the section of Examples. If the fineness of the polyolefin fiber is 10 dtex or more, the yarn breakage in the knitting step is small, the process passability is good, and the generation of fluff during use is small, and the durability is excellent. The fineness of the polyolefin fiber is more preferably 30 dtex or more. On the other hand, when the fineness of the polyolefin fiber is 500 dtex or less, it is more preferable because the flexibility of the knitted fabric is not impaired. The fineness of the polyolefin fiber is more preferably 300 dtex or less.

  The single fiber fineness of the polyolefin fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required characteristics, but is preferably 0.5 to 20 dtex. The single fiber fineness in the present invention refers to a value obtained by dividing the fineness measured by the method described in the section of Examples by the number of single fibers. When the single fiber fineness of the polyolefin fiber is 0.5 dtex or more, the yarn breakage in the knitting step is small, the process passability is good, the generation of fuzz during use is small, and the durability is excellent. In addition, since the spinning stress applied to the island component polyester (B) during melt spinning does not become too high, the molecular orientation of the polyester (B) in the polyolefin fiber described later can be suppressed. Since the molecular orientation of the polyester (B) is suppressed in the polyolefin fiber, the dye is sufficiently dyed, and a fiber structure excellent in coloring property is preferably obtained. The single fiber fineness of the polyolefin fiber is more preferably 0.6 dtex or more. On the other hand, if the single fiber fineness of the polyolefin fiber is 20 dtex or less, the flexibility of the fiber structure is not impaired, which is preferable. The single fiber fineness of the polyolefin fiber is more preferably 12 dtex or less.

  The number of filaments constituting the polyolefin fiber of the present invention is not particularly limited and may be appropriately selected depending on the application and required characteristics, but is preferably from 3 to 250. It is preferable that the number of filaments of the polyolefin fiber is 3 or more, since the flexibility of the knitted fabric is not impaired. The number of filaments of the polyolefin fiber is more preferably 10 or more, still more preferably 15 or more, and particularly preferably 20 or more. On the other hand, if the number of filaments of the polyolefin fiber is 250 or less, a multifilament having excellent uniformity can be obtained because the filament can be uniformly cooled during melt spinning. The number of filaments of the polyolefin fiber is more preferably 200 or less, further preferably 150 or less, and particularly preferably 100 or less.

  The strength of the polyolefin fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required characteristics, but is preferably from 1.0 to 6.0 cN / dtex from the viewpoint of mechanical characteristics. The strength in the present invention refers to a value measured by the method described in the section of Examples. It is preferable that the strength of the polyolefin fiber is 1.0 cN / dtex or more, since the generation of fluff during use is small and the durability is excellent. The strength of the polyolefin fiber is more preferably 2.0 cN / dtex or more, and even more preferably 3.0 cN / dtex or more. On the other hand, if the strength of the polyolefin fiber is 6.0 cN / dtex or less, it is preferable because the flexibility of the knitted fabric is appropriately maintained.

  The elongation of the polyolefin fiber of the present invention is 10 to 80%. The elongation in the present invention refers to a value measured by the method described in the section of Examples. When the elongation of the polyolefin fiber is 10% or more, the molecular orientation of the polyester (B) that can be dyed in the polyolefin fiber is suppressed, so that the dye is sufficiently dyed, and the fiber and the fiber are excellent in color development. A structure can be obtained. In addition, the abrasion resistance of the fiber and the fiber structure is improved, the generation of fluff during use is reduced, and the durability is improved. The elongation of the polyolefin fiber is more preferably 20% or more. On the other hand, if the elongation of the polyolefin fiber is 80% or less, the molecular orientation of the polyester (B) that can be dyed in the polyolefin fiber does not become too low. The dropout of the dye from B) is suppressed, and a fiber and a fibrous structure excellent in color developability and levelness can be obtained. Further, the detachment of the dye is suppressed even during friction and washing during use, and a fiber and a fiber structure having excellent color fastness can be obtained. The elongation of the polyolefin fiber is more preferably 70% or less.

  The polyolefin fiber of the present invention is not particularly limited with respect to the cross-sectional shape of the fiber, can be appropriately selected according to the application and required characteristics, may be a perfect circular circular cross-section, a non-perfect circular cross-section Is also good. Specific examples of the non-circular cross section include multi-lobe, polygon, flat, elliptical, C-shape, H-shape, S-shape, T-shape, W-shape, X-shape, Y-shape, T-shape, cross-shape, and hollow Examples include, but are not limited to, shapes. In addition, these cross sections may be used alone or in combination of two or more.

  The polyolefin fiber of the present invention preferably has a crimp rate of 10% or more when pulled out from a knitted fabric. The crimp ratio in the present invention is measured by the method described in the section of Examples. When the crimp ratio of the polyolefin fiber is 10% or more, the bulkiness is improved, and the voids of the knitted fabric are filled with the polyolefin fiber, whereby the sheer resistance is improved. Further, the stain prevention property is improved. The crimp rate of the polyolefin fiber is more preferably 20% or more, and even more preferably 30% or more.

  The method for crimping the polyolefin fiber of the present invention includes, but is not limited to, air processing, false twist processing, stuffing method, rubbing method, wall processing, gear processing, knit denitration, and the like. In particular, false twisting is preferable because crimping is easy and the productivity is excellent.

  When performing false twisting, a so-called bulerian process, in which a heater is used only in the twisted portion, that is, a so-called wooly process, and further, a heater is also used in the untwisted portion, can be appropriately selected.

  As a device used for false twisting, here, FR (feed roller), 1DR (1 draw roller) heater, cooling plate, false twist device, 2DR (2 draw roller), 3DR (3 draw roller), entangled nozzle, 4DR ( 4 draw roller) and a false twisting device equipped with a winder.

  The processing magnification between FR-1DR can be appropriately selected according to the elongation of the fiber used for false twisting and the elongation of the fiber after false twisting, but is preferably 1.0 to 2.0 times. .

  The heating method of the heater may be any of a contact type and a non-contact type. The heater temperature can be appropriately selected according to the melting points of the polyolefin (A) and the polyester (B) and the strength and elongation of the fiber after the false twisting process. In the case of the contact type, the heater temperature is 90 ° C. As described above, the heater temperature in the non-contact type is preferably 150 ° C. or higher. If the heater temperature in the case of the contact type is 90 ° C. or more, or the heater temperature in the case of the non-contact type is 150 ° C. or more, the yarn supplied to the false twisting is sufficiently preheated, and It is preferable because deformation becomes uniform, generation of fluff and unevenness of fineness can be suppressed, and high-quality fibers and fiber structures excellent in uniformity in the fiber longitudinal direction and excellent in levelness can be obtained. In the case of the contact type, the heater temperature is more preferably 100 ° C or higher, and further preferably 110 ° C or higher. In the case of the non-contact type, the heater temperature is more preferably 200 ° C or higher, and further preferably 250 ° C or higher. The upper limit of the heater temperature may be a temperature at which undrawn yarn or drawn yarn used for false twisting does not fuse in the heater.

  The false twist device is preferably a friction false twist type, such as a friction disk type or a belt nip type, but is not limited thereto. Above all, even when the friction disk type is operated for a long time, it is preferable because false twisting can be performed stably. The magnification between 2DR-3DR and between 3DR-4DR can be appropriately selected according to the strength and elongation of the fiber after false twisting, but is preferably 0.9 to 1.0 times. Between 3DR and 4DR, in order to improve the processability of the fiber after false twisting, entanglement may be imparted by an entanglement nozzle or oiling may be performed by an oil supply guide.

  The processing speed when performing false twisting can be appropriately selected, but is preferably 200 to 1000 m / min. A processing speed of 200 m / min or more is preferable because the running yarn is stable and yarn breakage can be suppressed. The processing speed is more preferably 300 m / min or more, and further preferably 400 m / min or more. On the other hand, when the processing speed is 1000 m / min or less, yarn breakage during false twisting is suppressed, and stable false twisting can be performed, which is preferable. The processing speed is more preferably 900 m / min or less, further preferably 800 m / min or less.

  In the polyolefin fiber of the present invention, the orientation parameter of the polyester (B) in the polyolefin fiber determined by Raman spectroscopy is 1.0 to 10.0. The orientation parameter of the polyester (B) in the polyolefin fiber obtained by Raman spectroscopy in the present invention refers to a value measured by the method described in the section of Examples. The orientation parameter is an index of the molecular orientation of the polymer. The minimum value is 1.0, indicating that the polymer is not oriented. The larger the value, the higher the molecular orientation. When the orientation parameter of the polyester (B) in the polyolefin fiber is 2.5 or more, the dropout of the dye from the polyester (B) is suppressed in the reduction washing and the soaping after the dyeing, and the coloring property and the level dyeing property are obtained. It is possible to obtain a fiber structure excellent in quality. Further, the detachment of the dye is suppressed even during friction during use and washing, and a fiber structure excellent in dyeing fastness can be obtained. On the other hand, when the orientation parameter of the polyester (B) in the polyolefin fiber is 10.0 or less, the dye is sufficiently dyed because the molecular orientation of the polyester (B) that can be dyed in the polyolefin fiber is suppressed. And a fibrous structure having excellent coloring properties. The orientation parameter of the polyester (B) in the polyolefin fiber is more preferably 7.0 or less.

  The polyolefin fiber of the present invention preferably has a polyester (B) crystallinity of 1 to 40% in the polyolefin fiber determined by Raman spectroscopy. The crystallinity of the polyester (B) in the polyolefin fiber obtained by Raman spectroscopy in the present invention refers to a value measured by the method described in the section of Examples. If the degree of crystallinity of the polyester (B) in the polyolefin fiber is 1% or more, dropout of the dye from the polyester (B) is suppressed in reduction washing or soaping after dyeing the polyolefin fiber, and color development and It is preferable because a fiber and a fiber structure having excellent leveling properties can be obtained. In addition, it is preferable because the dye is prevented from falling off even during friction and washing during use, and a fiber and a fiber structure excellent in dyeing fastness can be obtained. The crystallinity of the polyester (B) in the polyolefin fiber is more preferably 10% or more, and even more preferably 15% or more. On the other hand, if the crystallinity of the polyester (B) in the polyolefin fiber is 40% or less, the dye is sufficiently dyed on the amorphous portion of the polyester (B) in the polyolefin fiber, and the fiber structure having excellent coloring properties. It is preferable because the body can be obtained. The crystallinity of the polyester (B) in the polyolefin fiber is more preferably 35% or less, further preferably 30% or less.

  Fibers having a higher hydrophilicity than the polyolefin of the present invention (hereinafter also referred to as hydrophilic fibers) are fibers having a contact angle with water of 0 to 90 °. The contact angle in the present invention refers to a value measured by the method described in the examples. When the contact angle with water is 0 to 90 °, the fibers are excellent in hydrophilicity. By arranging the fibers on the surface of the knitted fabric, the sweat is localized on the surface of the knitted fabric and the stain on the front surface of the knitted fabric is prevented. can do. The contact angle with water is more preferably 0 to 60 °, and even more preferably 0 to 30 °.

  The hydrophilic fiber of the present invention is not particularly limited with respect to the material, and includes synthetic fibers such as polyester, nylon, acrylic, modified polyolefin, and polyurethane, and has been modified by copolymerization, graft polymerization, plasma treatment, or the like. There is no problem. In addition, there is no problem in using a naturally-derived material such as cotton, hemp, wool, silk, and regenerated cellulose fiber, and the material may be modified by a known method. These fibers may be used alone or in combination of two or more.

  The hydrophilic fiber of the present invention is not particularly limited with respect to the cross-sectional shape of the fiber, and can be appropriately selected according to the application and required characteristics. This is preferable because fine voids can be obtained, and the water absorption is further improved. Specific examples of the non-circular cross section include multi-lobe, polygon, flat, elliptical, C-shape, H-shape, S-shape, T-shape, W-shape, X-shape, Y-shape, T-shape, cross-shape, and hollow Examples include, but are not limited to, shapes. In addition, only one type of non-circular cross section may be used, or two or more types may be used in combination.

  The hydrophilic fiber of the present invention is not particularly limited with respect to the form of the fiber, and may be in any form such as a drawn yarn, a spun yarn, an air-processed yarn, a false twisted yarn, a twisted yarn, and a covering yarn. It is preferably a multifilament composed of fibers.

  The fineness of the hydrophilic fiber of the present invention as a multifilament is not particularly limited and can be appropriately selected depending on the application and required characteristics, but is preferably from 10 to 2000 dtex. The fineness in the present invention refers to a value measured by the method described in Examples. When the fineness of the hydrophilic fiber is 10 dtex or more, it is preferable because the yarn breakage in the knitting step is small, the process passability is good, the generation of fuzz during use is small, and the durability is excellent. The fineness of the hydrophilic fiber is more preferably 30 dtex or more. On the other hand, if the fineness of the hydrophilic fiber is 1000 dtex or less, it is preferable because the flexibility of the knitted fabric is not impaired. The fiber having a higher hydrophilicity than the fineness of the polyolefin fiber is more preferably 1000 dtex or less, further preferably 500 dtex or less.

The single fiber fineness of the hydrophilic fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required characteristics, but is preferably from 0.3 to 20 dtex. The single fiber fineness in the present invention refers to a value obtained by dividing the fineness measured by the method described in the section of Examples by the number of single fibers. When the single fiber fineness of the hydrophilic fiber is 0.3 dtex or more, the yarn breakage in the knitting step is small, and in addition to the good process passage property, the generation of fuzz during use is small, and the durability is excellent. . The single fiber fineness of the hydrophilic fiber is more preferably 0.6 dtex or more. On the other hand, when the single fiber fineness of the hydrophilic fiber is 20 dtex or less, the flexibility of the fiber structure is preferably kept at an appropriate level. The single fiber fineness of the hydrophilic fiber is more preferably 5 dtex or less.
The number of filaments constituting the hydrophilic fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required characteristics. Preferably, the number is 250. When the number of filaments of the hydrophilic fibers is 3 or more, it is preferable because the flexibility of the knitted fabric is not impaired and the water absorption is improved by the capillary action of the fiber gap. The number of filaments of the hydrophilic fiber is more preferably 10 or more, still more preferably 15 or more, and particularly preferably 20 or more. On the other hand, the number of filaments of the hydrophilic fiber is appropriately adjusted to the number of multifilaments composed of polyolefin fibers in a well-balanced manner, and by setting the number of filaments to 250 or less, a fiber structure maintaining flexibility can be obtained. The number of filaments of the hydrophilic fiber is more preferably 200 or less, further preferably 150 or less, and particularly preferably 100 or less.

  When dyeing the knitted fabric of the present invention, a disperse dye and a cationic dye can be suitably used, and a dye for the hydrophilic fiber can be appropriately selected according to the material. The dyeing method in the present invention is not particularly limited, and according to a known method, a cheese dyeing machine, a liquid jet dyeing machine, a drum dyeing machine, a beam dyeing machine, a jigger, a high-pressure jigger and the like can be suitably used. In the present invention, the dye concentration and the dyeing temperature are not particularly limited, and a known method can be suitably used. Furthermore, if necessary, reductive washing after scouring and dyeing is performed.

  The knitted fabric of the present invention is excellent in lightness and color fastness, has an effect of suppressing spots due to sweat and the like, and further has excellent washing durability. The knitted fabric obtained by the present invention can be suitably used for materials for clothing and a wide range of applications requiring lightness and color development. Specifically, general clothing such as women's clothing, men's clothing, lining, underwear, down, vest, inner, pat, outerwear, windbreaker, outdoor clothing, ski clothing, golf clothing, T-shirts, sports clothing such as swimwear, Uses include bedding and materials, but are not limited to these. Further, the front and back of the knitted fabric can be appropriately selected depending on the use.

  Hereinafter, the present invention will be described in more detail with reference to examples. In addition, each characteristic value in the examples is obtained by the following method.

A. Area occupancy of polyolefin fiber on the front surface of the knitted fabric Using a microscope VHX-6000 manufactured by KEYENCE CORPORATION, a photograph of the front surface of the knitted fabric magnified at a constant magnification, preferably 500 times, is taken at a constant value of 5 cm ² . With respect to the range (A), the exposed area (S) of the polyolefin fiber was measured with winROOF manufactured by Mitani Shoji Co., Ltd., and calculated by the following percentage formula.
Area occupancy of polyolefin fibers on the front surface of the knitted fabric = (S / A) × 100
B. Fineness In an environment of a temperature of 20 ° C. and a humidity of 65% RH, 100 m of the fibers used in Examples and Comparative Examples were slashed using an electric measuring machine manufactured by INTEC. The weight of the obtained skein was measured, and the fineness (dtex) was calculated using the following equation.
Fineness (dtex) = weight of fiber 100m (g) x 100
The measurement was performed five times for one sample, and the average value was defined as fineness.

C. Strength and Elongation The strength and elongation were calculated according to JIS L1013: 2010 (Test method for chemical fiber filament yarn) 8.5.1, using the fibers used in Examples and Comparative Examples as samples. In an environment of a temperature of 20 ° C. and a humidity of 65% RH, a tensile test was performed using Tensilon UTM-III-100 manufactured by Orientec, under the conditions of an initial sample length of 20 cm and a tensile speed of 20 cm / min. The strength (cN / dtex) is calculated by dividing the stress (cN) at the point showing the maximum load by the fineness (dtex), and using the elongation (L1) of the point showing the maximum load and the initial sample length (L0), The elongation (%) was calculated by the equation.
Elongation (%) = {(L1-L0) / L0} × 100
The measurement was performed 10 times for each sample, and the average value was defined as the strength and elongation.

D. Composite Ratio The total of polyolefin (A) and polyester (B) used as the raw materials of the polyolefin fiber was defined as 100 parts by weight, and A / B [parts by weight] was calculated as the composite ratio.

E. FIG. Melt viscosity ratio The polyolefin (A) and the polyester (B), which had been vacuum-dried in advance, were retained for 5 minutes in a nitrogen atmosphere using a capillary having a pore diameter of 1.0 mm and a hole length of 10 mm, using a Capillograph 1B manufactured by Toyo Seiki. The measurements were taken later. The measurement temperature was the same as the spinning temperature in a prototype example described later, and the apparent viscosity (Pa · s) at a shear rate of 1216 sec ⁻¹ was taken as the melt viscosity (Pa · s). The measurement was performed three times for each sample, and the average value was defined as the melt viscosity. The melt viscosities of the polyolefin (A) and the polyester (B) were defined as ηA and ηB, respectively, and the melt viscosity ratio was calculated using the following equation.
Melt viscosity ratio (ηB / ηA) = ηB / ηA
F. After embedding the polyolefin fiber obtained by the discontinuity of the island component in the trial production example with the epoxy resin, the fiber is cut in a direction perpendicular to the fiber axis with the epoxy resin using the LKB ultramicrotome LKB-2088, Ultrathin sections of about 100 nm thickness were obtained. After the obtained ultrathin section was stained by holding it in a gaseous phase of solid ruthenium tetroxide at room temperature for about 4 hours, the stained surface was cut with an ultramicrotome, and the ultrathin section stained with ruthenium tetroxide was obtained. Was prepared. Using a transmission electron microscope (TEM) model H-7100FA manufactured by Hitachi, a section perpendicular to the fiber axis, that is, a cross section of the fiber was observed on the stained ultrathin section under an acceleration voltage of 100 kV. A micrograph of the surface was taken. Observation is performed at each magnification of 300 times, 500 times, 1000 times, 3000 times, 5000 times, 10,000 times, 30000 times, and 50,000 times, and when taking a micrograph, the lowest that 100 or more island components can be observed Magnification was selected.

  Regarding the discontinuity of the island component, five micrographs of the fiber cross section were taken at an arbitrary interval of at least 10,000 times or more the diameter of the single fiber within the same single fiber, and the number of island components in each fiber cross section was measured. When the shape of the sea-island structure is different, the island component is determined to be discontinuous. When the island component is discontinuous, “○” is given. When the island component is not discontinuous, “x” is given.

G. FIG. Dispersion diameter of island component After embedding the polyolefin fiber obtained by the prototype example with epoxy resin, using an LKB ultramicrotome LKB-2088, cut the fiber together with the epoxy resin in the direction perpendicular to the fiber axis, Ultra-thin sections of about 100 nm were obtained. After the obtained ultrathin section was stained by holding it in a gaseous phase of solid ruthenium tetroxide at room temperature for about 4 hours, the stained surface was cut with an ultramicrotome, and the ultrathin section stained with ruthenium tetroxide was obtained. Was prepared. Using a transmission electron microscope (TEM) model H-7100FA manufactured by Hitachi, a section perpendicular to the fiber axis, that is, a cross section of the fiber was observed on the stained ultrathin section under an acceleration voltage of 100 kV. A micrograph of the surface was taken. Observation is performed at each magnification of 300 times, 500 times, 1000 times, 3000 times, 5000 times, 10,000 times, 30000 times, and 50,000 times, and when taking a micrograph, the lowest that 100 or more island components can be observed Magnification was selected. With respect to the taken photograph, the diameter of 100 island components randomly extracted from the same photograph was measured with image processing software (WINROOF manufactured by Mitani Corporation), and the average value was taken as the dispersion diameter (nm) of the island component. . Since the island component existing in the fiber cross section is not always a perfect circle, if it is not a perfect circle, the diameter of the circumscribed circle is adopted as the dispersion diameter of the island component. When the number of island components present in the fiber cross section of the single fiber is less than 100, the cross section of the fiber is observed using a plurality of single fibers manufactured under the same conditions as a sample, and when a micrograph is taken, the single fiber The highest magnification at which the entire image can be observed was selected. With respect to the photograph taken, the dispersion diameter of the island component present in the fiber cross section of each single fiber was measured, and the average value of the dispersion diameters of the 100 island components in total was defined as the dispersion diameter of the island component.

H. Orientation parameters The polyolefin fiber obtained by the prototype example was used as a sample, and the measurement was performed under the following conditions.The polarization Raman spectra were obtained by setting the parallel direction when the polarization direction coincided with the fiber axis and the vertical condition when the polarization direction was perpendicular. Was. When a Raman band near 1615 cm ^-1 attributed to the C = C stretching vibration of the polyester (B) exists, the Raman band intensity under the parallel condition is I ₁₆₁₅ parallel, and the Raman band intensity under the vertical condition is I ₁₆₁₅ vertical. The orientation parameter was calculated using the following equation. When there is no Raman band around 1615 cm ^-1 attributed to C ＝ C stretching vibration of polyester (B), the Raman band around 1730 cm ^-1 attributed to CＣO stretching vibration of polyester (B) does not exist. The Raman band intensity under the parallel condition was I ₁₇₃₀ parallel, and the Raman band intensity under the vertical condition was I ₁₇₃₀ perpendicular, and the orientation parameter was calculated using the following equation. The measurement was performed five times for one sample, and the average value was used as the orientation parameter.
Orientation parameter = I ₁₆₁₅ parallel / I ₁₆₁₅ vertical, or Orientation parameter = I ₁₇₃₀ parallel / I ₁₇₃₀ vertical device: inVia manufactured by RENISHAW
Measurement mode: Raman microscopic objective lens: x20
Beam diameter: 5 μm
Light source: YAG 2nd 532 nm Line
Laser power: 100mW
Diffraction grating: Single-3000 gr / mm
Slit: 65 μm
Detector: CCD 1024 × 256 pixels.

I. Crystallinity In the above H, the same measurement was performed except that a laser beam polarized parallel to the fiber axis was incident and the scattered light was measured without using an analyzer to obtain a polarized Raman spectrum. The full width at half maximum of the Raman band near 1730 cm ⁻¹ attributable to the C ＝ O stretching vibration of the polyester (B) was _{defined as Δν1730,} and the crystallinity was calculated using the following equation. The converted density ρ in the following equation is empirically derived from the half widths of various PET samples.
Conversion density ρ (g / cm ³ ) = (305− _Δν1730 ) / 209
Crystallinity (%) = 100 × (ρ-1.335) / (1.455-1.335)
The measurement was performed five times for one sample, and the average value was defined as the crystallinity.

J. Contact angle of fiber A yarn sample was prepared by arranging 200 single fibers in parallel on a black plate without spacing, and the yarn sample was 1.5 g / L of sodium carbonate and 0.5 g of Granup US-20 manufactured by Meisei Chemical Industry. After scouring at 80 ° C. for 20 minutes in an aqueous solution containing / L, the resultant was washed with running water for 30 minutes and dried in a 60 ° C. hot air drier for 60 minutes. Using a contact angle meter manufactured by Kyowa Interface Science Co., Ltd., 1.0 μL of a water droplet was dropped on the sample after the scouring, and the contact angle was measured. The measurement was performed five times for one sample, and the average value was defined as the contact angle. The contact angle was 0 ° when water droplets were absorbed by the fibers.

K. Crimp ratio The knitted fabric obtained by enlarging the fiber extracted from the knitted fabric to a fixed magnification, preferably 500 times, using a Keyence Microscope VHX-6000 in a state where the fiber is adhered to the sample table with a tension enough to eliminate bending due to the knitted structure. A photograph of the ground front surface was taken, and a crimp interval D (mm) and a crimp length L (mm) were obtained. The crimp interval D is the length connecting the vertices of the crimp with a straight line, and the crimp length L is the length connecting the peak-valley-ridge of the crimp with a polygonal line. The crimp interval D and the crimp length L were measured at 20 points each, and the following equation was used. Crimp rate (C) = (L / D-1) × 100 (%)
The crimp rate (C) was determined by the above, and the average was calculated.

L. In the dyeing process of Examples and Comparative Examples described in the latter part, a white knitted fabric was produced by processing under the same conditions without using a dye, and the obtained knitted fabric was cut into a square of 5 cm, The measurement was performed using a Konica Minolta L * a * b * colorimetric spectrophotometer CM-3600d under the conditions of a D65 light source 6, a viewing angle of 10 degrees, and an SEC method (specular reflection light removal conditions). As a measurement procedure, first, a sample for measuring transparency is cut into a square of 5 cm. Next, a 100% taffeta (L * = 90 to 91) using a semi-polyester filament having a round cross section is used as a white plate, and the L * value (Lw) of the taffeta used is measured. Further, as a blackboard, a taffeta (L * = 19 to 20) using a round cross-section semi-dal filament 100% is used, and the L * value (Lb) of the used taffeta is measured. Further, a white plate is quadrupled on the back surface of the knitted fabric of the present invention, and the white plate is mounted on a colorimeter, and the L * value (Lfw) of the front surface is measured. Next, the blackboard is superimposed on the back surface of the same knitted fabric in quadruplicate and mounted on a colorimeter, and the L * value (Lfb) of the front surface is measured. The measurement was performed five times, and the average value was obtained. Then, the measured value was applied to the following equation to determine the sheer-proof property.
Transparency (%) = 100− (Lfw−Lfb) / (Lw−Lb) × 100
The closer to 100 (%), the less transparent the index of sheerproofing.

M. L * value (after finishing setting): sharpness, ΔE (color loss in process)
Using the knitted fabric after dyeing and reduction washing as a sample, using a Konica Minolta spectrophotometer CM-3700d, a D65 light source, a viewing angle of 10 °, and optical conditions as SCE (specular reflection light removal method), color tone ( L * value, a * value, b * value) were measured. The measurement was performed three times for each sample, and the average value was adopted. Further, based on the color tone measurement result, the following formula ΔL * = L * (after reduction washing) −L * (after staining)
Δa * = a * (after reduction washing) −a * (after staining)
Δb * = b * (after reduction washing) −b * (after staining)
ΔE = {(ΔL *) ² + (Δa *) ² + (Δb *) ² } ^0.5
Was used to calculate ΔE.

N. Leveling property The leveling property of the knitted fabric after the finish setting was evaluated in four stages of ◎, △, Δ, and × by a consultation of five inspectors having five years or more of experience in determining the quality. In the evaluation, ◎ is the best, and ○ and △ are worse in the order of ×, and X is the lowest.
◎: Very uniformly dyed, no dyeing spots observed ○: Almost uniformly dyed, almost no dyeing spots observed Δ: Almost not uniformly dyed, slightly dyed spots X: Not uniformly dyed, and clearly stained spots are observed.

O. Friction Fastness The friction fastness was evaluated in accordance with the drying test of JIS L0849: 2013 (Testing method for dye fastness to friction) 9.2 Friction tester type II (Gakushin type) method. After performing a friction treatment on a knitted fabric with a white cotton cloth (cotton No. 3-1) specified in JIS L0803: 2011 using a Gakushin type friction tester RT-200 manufactured by Daiei Kagaku Seiki, the degree of contamination of the white cotton cloth Was evaluated using a gray scale for staining specified in JIS L0805: 2005 to evaluate friction fastness (staining).

P. Washing Fastness The washing fastness was evaluated according to JIS L0844: 2011 (Testing method for color fastness to washing) A-2. After washing the knitted fabric with the attached white cloth (cotton 3-1 and nylon 7-1) specified in JIS L0803: 2011 using a round meter manufactured by Daiei Kagaku Seisakusho, the degree of discoloration of the sample is measured according to JIS. L0804: The washing fastness (discoloration) was evaluated by classifying using a discoloration gray scale specified in 2004. Washing fastness (staining) was evaluated by determining the degree of staining of the attached white cloth by using a staining gray scale specified in JIS L0805: 2005. Further, the degree of contamination of the washing liquid after the washing treatment was evaluated by using a gray scale for contamination specified in JIS L0805: 2005 to evaluate the washing fastness (liquid contamination).

Q. Front and back diffusion area ratio 0.1 cc of an ink solution obtained by diluting a commercially available fountain pen ink (INK-350-B made by PILOT) twice with water is dropped on a glass plate. The substrate was placed such that the surface having an area occupancy of 0 to 40% (hereinafter referred to as the back surface) faces the lower side in contact with the ink liquid. After being left for 60 seconds to absorb the ink liquid, the knitted fabric was transferred onto another glass plate, and again left for 3 minutes with its back face down. The area where the area occupancy of the polyolefin fiber of the sample knitted fabric is 0 to 40% (hereinafter referred to as the front surface), and the diffusion area of the ink liquid on the back surface is measured with a digital planimeter (KP-90 manufactured by Uchida Yoko). The front and back diffusion area ratio (diffusion area on the back surface / diffusion area on the front surface) was calculated.

R. Anti-stain properties Drop 1.0 cc of water onto a glass plate, place the knitted fabric on top of it, and make sure that the surface of the polyolefin fiber having an area occupancy of 0 to 40% (hereinafter referred to as the back surface) faces the lower side in contact with water. Placed on After being left for 60 seconds to absorb water, the knitted fabric was transferred onto another glass plate, and again left for 3 minutes with its back face down. Here, the change of the front surface of the knitted fabric before and after water absorption was stained in five stages of ◎, ○, △, ×, XX by the consultation of five inspectors who had 5 years or more of experience in class judgment. The prevention was evaluated. ◎ is the best, and 、, Δ, and × are worse in this order, and XX indicates the worst.
A: No discoloration before and after water absorption was observed.
：: Almost no discoloration before and after water absorption was observed.
Δ: Discoloration before and after water absorption is slightly recognized.
X: Discoloration before and after water absorption is clearly recognized.
XX: Discoloration before and after water absorption is more clearly recognized.

  Further, after 100 washes, the anti-stain property was similarly evaluated. The washing method is based on the 103 method of JIS L0217: 1995. That is, using a household electric washing machine with a centrifugal dehydrator specified in JIS C 9606, water at a liquid temperature of 40 ° C. was poured to a water level line indicating a standard water amount in a water tank, and JIS K3303: 2000 was used at a ratio of a standard use amount. The specified additive-free laundry detergent is added and dissolved to form a washing liquid. A sample and a load cloth are introduced into the washing liquid so that the bath ratio becomes 1:30, and the operation is started. After treating for 5 minutes, the operation is stopped, the sample and the load cloth are dehydrated with a dehydrator, and then the washing liquid is replaced with fresh water of 30 ° C. or less, and rinsed for 2 minutes at the same bath ratio. After rinsing for 2 minutes, the operation is stopped, the sample and the load cloth are dehydrated, rinsed again for 2 minutes, dehydrated, and hung without direct sunlight.

  Subsequently, a trial production example of the polyolefin fiber is shown below.

Prototype example 1
90 parts by weight of polypropylene (PP) (Novatec MA2 manufactured by Nippon Polypropylene) as the polyolefin (A) and 10 parts by weight of polyethylene terephthalate as the polyester (B) are added, and the mixture is kneaded at a kneading temperature of 280 ° C. using a biaxial extruder. went. After the strand discharged from the twin-screw extruder was water-cooled, it was cut into a length of about 5 mm with a pelletizer to obtain a pellet. The obtained pellets were vacuum-dried at 150 ° C. for 12 hours, and then supplied to an extruder-type melt spinning machine to be melted. The spinning temperature was 285 ° C., and the spinning rate was 32.5 g / min. The spun yarn was obtained by discharging from a discharge hole length of 0.23 mm, 48 holes, and a round hole. The spun yarn is cooled with a cooling air having a wind temperature of 20 ° C. and a wind speed of 25 m / min, and is converged by applying an oil agent with a lubricating device, and is taken up by a first godet roller rotating at 1250 m / min. It was wound by a winder rotating at 1250 m / min through a second godet roller rotating at 1 / min to obtain an undrawn yarn of 260 dtex-48f. The obtained undrawn yarn is subjected to two-stage drawing under the conditions of a first hot roller temperature of 30 ° C., a second hot roller temperature of 30 ° C., and a third hot roller temperature of 130 ° C., and is drawn at a total draw ratio of 3.1 times. , 84dtex-48f. Table 1 shows the fiber properties of the obtained fibers.

Prototype example 2
Using polyethylene terephthalate vacuum-dried at 150 ° C. for 12 hours as a core component and polypropylene (PP) (Novatec MA2 manufactured by Nippon Polypropylene) as a sheath component, each component was supplied to an extruder and melted, and a spinning temperature of 285 ° C. A core-sheath composite spinneret (discharge hole diameter 0.18 mm, discharge hole length 0.23 mm, number of holes 48, round hole) was discharged at a core component discharge amount of 3.25 g / min and a sheath component discharge amount of 26.0 g / min. A drawn yarn was obtained under the same conditions as in Prototype Example 1 except that a spun yarn was obtained. Table 1 shows the fiber properties of the obtained fibers.

Prototype examples 3, 4
In Prototype Example 1, a drawn yarn in which the dispersion diameter of polyethylene terephthalate was changed by changing the kneading strength in a biaxial extruder was obtained. Table 1 shows the fiber properties of the obtained fibers.

Prototyping Examples 5-7
In Prototype Example 1, a drawn yarn was obtained in which the composite ratio of polypropylene (PP) (Novatec MA2 manufactured by Japan Polypropylene) and polyethylene terephthalate was changed as shown in Table 1. Table 1 shows the fiber properties of the obtained fibers.

Prototype examples 8 to 10
The polyester (B) in Prototype Example 1 and polyethylene terephthalate polymerized 30 mol% copolymer of isophthalic acid (IPA) as the dicarboxylic acid component, the melt viscosity of the polyolefin melt viscosity of _(A) (η A) and the polyester (B) (eta _B ) and the melt viscosity ratio of the (η _{B /} η _a) was changed as shown in Table 1 to obtain a drawn yarn under the same conditions as prototype example 1. Table 1 shows the evaluation results of the fiber characteristics and the fabric characteristics of the obtained fibers.

Prototype example 11
A stretched yarn was obtained under the same conditions as in Prototype Example 1, except that polyethylene terephthalate in which polyester (B) was a dicarboxylic acid component and adipic acid (AA) was copolymerized at 15 mol% in Prototype Example 1 was used. Table 1 shows the evaluation results of the fiber characteristics and the fabric characteristics of the obtained drawn yarn.

  Examples and comparative examples using the polyolefin fibers shown in the prototype examples are shown below.

Example 1
A 28G single circular knitting machine was used to knit a reversible sheeting fabric so that the polyolefin fibers obtained in Prototype Example 1 were arranged on the needle surface and 84dtex-48f polyethylene terephthalate false twist yarn was arranged on the sinker surface. . Next, as a dyeing process, the obtained knitted fabric was scoured at 80 ° C. for 20 minutes in an aqueous solution containing 1.5 G / L of sodium carbonate and 0.5 G / L of surfactant Granup US-20 manufactured by Meisei Chemical Industry. It was washed with running water for 30 minutes and dried in a hot air dryer at 60 ° C. for 60 minutes. The scoured knitted fabric after scouring was dry-heat set at 135 ° C. for 1 minute, and 1.3% by weight of Nippon Kayaku Polyalon Blue Blue UT-YA was added as a disperse dye to the scoured knitted fabric after dry heat setting to adjust the pH. After dyeing in a dyeing solution adjusted to 5.0 at a bath ratio of 1: 100 and 130 ° C. for 45 minutes, it was washed with running water for 30 minutes and dried in a hot air dryer at 60 ° C. for 60 minutes. The knitted tube after dyeing is mixed with an aqueous solution containing 2 g / L of sodium hydroxide, 2 g / L of sodium dithionite, and 0.5 g / L of surfactant Granup US-20 manufactured by Meisei Chemical Co., Ltd., at a bath ratio of 1: 100. After reducing and washing at 80 ° C. for 20 minutes, it was washed with running water for 30 minutes and dried in a 60 ° C. hot air drier for 60 minutes. The tubular knit after the reduction washing was dry-heat set at 135 ° C. for 1 minute, and a finishing set was performed. Table 2 shows the properties of the obtained knitted fabric.

Comparative Example 1
A knitted fabric was produced in the same manner as in Example 1 except that the polyolefin fiber in Example 1 was changed to the drawn yarn of Prototype Example 2. Since the obtained knitted fabric was a core-sheath yarn in which polyolefin fibers were provided with polyethylene terephthalate in the core, the knitted fabric had low sheer-proof property and poor stain-proof property. Table 2 shows the properties of the obtained knitted fabric.

Comparative Example 2
A knitted fabric was produced in the same manner as in Example 1 except that water-repellent polyethylene terephthalate fiber was used instead of the polyolefin fiber. Here, the water-repellent polyethylene terephthalate fiber is a polyethylene terephthalate fiber that has been subjected to a water-repellent treatment by a known method, and the concentration of perfluorooctanoic acid and perfluorooctanesulfonic acid in consideration of the environment is 0 to 0 as a water repellent. The one coated with 2.0 wt% of a fluorine-based water repellent of 5 ng / g or less was used. The resulting knitted fabric was made of polyester fibers, so that lightness was not obtained, and the water repellent was dropped off by the washing treatment, so that the stain resistance after washing was poor. Table 2 shows the properties of the obtained knitted fabric.

Examples 2-3 and Comparative Example 3
A knitted fabric was produced in the same manner as in Example 1 except that the yarn feeding position of the polyolefin fiber was adjusted and the area occupancy of the polyolefin fiber in the knitted fabric was changed as shown in Table 2. In the knitted fabric of Comparative Example 3, since the area occupancy of the polyolefin fiber on both the front and back sides was 50%, the droplets in the stain prevention evaluation could not be unevenly distributed on the back surface, so that the stain prevention property was poor.

Example 4
A knitted fabric was produced in the same manner as in Example 1, except that the fineness of the hydrophilic fiber was changed and the mixing ratio of the fibers in the knitted fabric was changed as shown in Table 2. Table 2 shows the properties of the obtained knitted fabric.

Comparative Example 4
A knitted fabric was produced in the same manner as in Example 1 except that the polyolefin fiber was used also for the sinker surface in Example 1. Since the obtained knitted fabric was composed only of polyolefin fibers, it was poor in stain prevention properties. Table 3 shows the properties of the obtained knitted fabric.

Example 5
The polyolefin fiber obtained in Prototype Example 1 was used as ground yarn, and a knitted fabric having an inlay sheeting structure was knitted using a 28G single circular knitting machine using 84 dtex-48f polyethylene terephthalate false twist yarn as an insertion yarn. The dyeing process was performed in the same manner as in Example 1, and the properties of the obtained knitted fabric are shown in Table 3.

Example 6
Using a 28G double circular knitting machine, the polyolefin fiber obtained in Prototype Example 1 was knitted with a reversible (8-port) structure so that 84 dtex-48f polyethylene terephthalate false twist yarn was arranged on the sinker surface. Obtained. The dyeing process was performed in the same manner as in Example 1, and the properties of the obtained knitted fabric are shown in Table 3.

Example 7
The polyolefin fiber obtained in Prototype Example 1 was arranged on the front reed, and 84dtex-48f polyethylene terephthalate false twist yarn was arranged on the back reed, and a knitted fabric having a half tricot structure was knitted using a single tricot knitting machine. The dyeing process was performed in the same manner as in Example 1, and the properties of the obtained knitted fabric are shown in Table 3.

Examples 8 and 9
In Example 1, a knitted fabric was produced in the same manner as in Example 1, except that the polyolefin fiber was changed to the drawn yarn obtained in Prototype Example 3 in Example 8 and the drawn yarn obtained in Prototype Example 4 in Example 9. In particular, since the knitted fabric obtained in Example 8 had a small dispersion diameter of the polyester (B), the light scattering and the abrasion resistance were appropriately improved, so that the knitted fabric was excellent in stain resistance and color fastness. Table 3 shows the properties of the obtained knitted fabric.

Examples 10 to 12
In Example 1, the knitting was performed in the same manner as in Example 1 except that the polyolefin fiber was changed to the drawn yarn obtained in Prototype Example 5 in Example 10, the prototyping example 6 in Example 11, and the drawn yarn obtained in Prototype Example 7 in Example 12. The ground was made. Table 3 shows the properties of the obtained knitted fabric.

Example 13
A knitted fabric was produced in the same manner as in Example 1 except that the 84dtex-48f polyethylene terephthalate false twist yarn was a cotton spun yarn having a cotton count of 40. Table 4 shows the properties of the obtained knitted fabric.

Example 14
The drawn yarn obtained in Prototype Example 1 was cut into 38 mm, and opened using an OHARA blended cotton mill. Thereafter, the opened fiber was made into a card sliver using a card machine manufactured by Ishikawa Seisakusho, and passed twice through a drawing machine manufactured by Ishikawa Seisakusho to produce a sliver of 2.95 g / 100 cm. Furthermore, a roving (fiber bundle A) of 0.47 g / 100 cm was produced by passing through a roving machine manufactured by Toyota Industries Corporation. Thereafter, spinning was performed at a draft of 32 times using a ring spinning machine manufactured by Toyoda Automatic Loom, and a spun yarn consisting of polyolefin-based fibers of cotton count 40th was obtained at a traveler rotation speed of 9000 rpm. A knitted fabric was produced in the same manner as in Example 1 except that the spun yarn was used as the polyolefin fiber in Example 1. Table 4 shows the properties of the obtained knitted fabric.

Example 15
Using the drawn yarn obtained in Prototype Example 1, false twisting was performed under the following conditions to produce a false twisted yarn. FR (feed roller), 1DR (1 draw roller), 1st heater, cooling plate, false twist device, 2DR (2 draw roller), entangled nozzle, 3DR (3 draw roller), 2nd heater, 4DR (4 draw roller), Using a drawing false twisting device equipped with a winder, FR speed: 350 m / min, working ratio between FR-1DR 1.13 times, hot plate type contact 1st heater (length 110 mm): 145 ° C., cooling Plate length: 65 mm, friction disk type friction false twist device, magnification between 2DR-3DR: 0.98 times, magnification between 3DR-4DR: 0.94 times, hot plate type contact type 2nd heater (length 80 mm): At 120 ° C, entanglement is imparted by an entanglement nozzle between 2DR and 3DR, and false twisting is performed at 4DR-winder magnification: 0.98 times, and a temporary twist of 82 dtex-48f is obtained. To give a textured yarn. A knitted fabric was produced in the same manner as in Example 1, except that the polyolefin fiber was changed to the above false twisted yarn. Table 4 shows the properties of the obtained knitted fabric.

Example 16
In Example 15, the knitted fabric was the same as Example 12 except that the false twisting was performed with a 3DR-4DR magnification: 0.98 times, a 4DR-winder magnification: 0.94 times, and a second heater: room temperature (25 ° C). Was prepared. Table 4 shows the properties of the obtained knitted fabric.

Examples 17 to 19
In Example 1, the knitted fabric was the same as in Example 1 except that the polyolefin fiber was changed to the prototyping example 8 in Example 17, the prototyping example 9 in Example 18, and the drawn yarn obtained in Prototyping Example 10 in Example 19. Was prepared. Table 4 shows the properties of the obtained knitted fabric.

Examples 20 to 21
In Example 16, a knitted fabric subjected to false twisting and knitting was obtained in the same manner as in Example 16 except that the polyolefin fiber was the trial yarn obtained in Experimental Example 9 in Example 20, and the drawn yarn obtained in Experimental Example 11 in Example 21. . Table 4 shows the properties of the obtained knitted fabric.

The knitted fabric of the present invention is excellent in lightness and color fastness, has an effect of suppressing discoloration of the knitted fabric front surface due to sweat and the like, and the effect is excellent in durability to washing and the like, It can be suitably used for clothing materials and for a wide range of applications requiring lightness and color development.

Claims (4)

  A polyalloy fiber and at least one fiber having a higher hydrophilicity than the polyolefin fiber, wherein the polyolefin fiber is a polymer alloy fiber having a sea-island structure in which polyolefin (A) is a sea component and polyester (B) is an island component. The area occupancy of the polyolefin fiber on the front surface of the knitted fabric is 60% or more and 100% or less, and the area occupancy on the back surface of the knitted fabric is 0% or more and 40% or less.   The knitted fabric according to claim 1, wherein the crimp rate of the polyolefin fiber is 10% or more.   The elongation of the polyolefin fiber is 10 to 80%, and the orientation parameter of the polyester (B) in the polyolefin fiber determined by Raman spectroscopy is 1.0 to 10.0. Or the knitted fabric according to 2. The knitted fabric according to any one of claims 1 to 3, wherein the crystallinity of the polyester (B) in the polyolefin fiber determined by Raman spectroscopy is 1 to 40%.