Woven or knitted fabric

Abstract

To solve a problem occurring when polyolefin fibers, which are often adopted in a nonwoven fabric, are formed into textile, and also to provide a woven or knitted fabric formed of high-quality polyolefin fibers by solving the problem occurring particularly when dyeable polyolefin fibers capable of being dyed with dye are formed into a textile.SOLUTION: A woven or knitted fabric at least partially includes polyolefin fibers, and is colored, and has L* of 90 or less. Maximum color difference ΔE of the woven or knitted fabric is less than 2.0.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a woven or knitted fabric, and more particularly to a polyolefin woven or knitted fabric having good quality. [Background technology]

[0002] Polyethylene and polypropylene, which are types of polyolefins, have a low specific gravity among general-purpose resins, relatively high strength, excellent chemical resistance, and excellent moldability, such as being easily molded using a normal melt extruder, and are therefore used in a wide range of applications, from automobile parts to home appliances, stationery, and even medical materials. In addition, there are also textile products that utilize these excellent properties, and they are being developed for use in hygiene products such as masks and diapers, interior applications such as tile carpets, household rugs, and car mats, and material applications such as ropes, protective nets, filter cloths, narrow tapes, braided cords, and upholstery.

[0003] Polyolefin fibers are also excellent materials for clothing. Compared to other fibers, they have low thermal conductivity, making them less susceptible to heat loss, and because they have low surface tension they have excellent water repellency, making it possible to provide clothing that is both warm and water repellent.

[0004] However, polyolefin fibers have the drawback of being virtually dyeable because they have no polar functional groups, making it difficult to develop them for use in clothing. In general, a method of coloring them is used by adding pigments. It is difficult to stably develop vivid coloring or pale shades like dyes when adding pigments, so extremely dark colors such as black are the norm. In addition, there is a problem that the color development is limited because it depends on the type of pigment prepared in advance before fiberization. Furthermore, there is a problem that when pigments are used, the fibers tend to become hard and flexibility is lost.

[0005] Regarding the coloring of polyolefin fibers, various methods have been proposed as an alternative method to the above-mentioned pigment addition. For example, a technology has been proposed in which a dyeable polymer is kneaded into a polyolefin resin in advance to form an alloy, and the polymer alloy is then made into fiber, thereby enabling dyeing while maintaining the basic properties of polyolefin fibers. Among them, Patent Document 1 proposes a dyeable polyolefin fiber in which a copolymerized polyester copolymerized with cyclohexanedicarboxylic acid is blended into polyolefin as a dyeable amorphous polymer. Since the woven and knitted fabric made of the dyeable polyolefin fiber of Patent Document 1 has a dyeing component inside the fiber, it can be dyed by a normal dyeing method, and the woven and knitted fabric has excellent color development and color development, which was a problem with polyolefin fibers, and can be used for a wide range of clothing. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2017 / 154665 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the spinning process of synthetic fibers, in addition to providing an oil agent for bundling the fibers, various oil agents are also used in the subsequent high-level processing process to bundle the fibers and stabilize the process. In particular, oils such as lubricants mainly composed of mineral oils, which are used in the weaving and knitting process to prevent wear on the threads and needles, have a high affinity with hydrophobic polyolefins, and depending on the type, they tend to penetrate into the fiber bundle, and the residual oil may change the feel and appearance of the fabric. In particular, the dyeable polyolefin fiber in which a copolymerized polyester is kneaded as the second component described in Patent Document 1 may have a higher affinity than a single polyolefin fiber, and the penetration rate is also increased, so that the fluctuation in the amount of oil attached to the fabric may cause the above-mentioned fluctuation in the appearance and surface properties of the fabric. Therefore, compared to a single polyolefin fiber, the dyeable polyolefin fiber has a deeper penetration of the oil, making it difficult to maintain the amount of oil attached to the entire fabric uniform, and the feel and appearance of the fabric may be poor.

[0008] The object of the present invention is to solve the problems that arise when polyolefin fibers, which are often used in nonwoven fabrics, are made into textiles, and in particular to solve the problems that arise when dyeable polyolefin fibers that can be dyed with dyes are made into textiles, and to provide woven and knitted fabrics made of high-quality polyolefin fibers. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention has the following configuration. (1) A woven or knitted fabric, which contains at least a portion of a polyolefin fiber and is colored with an L* of 90 or less, and which has a maximum color difference ΔE of less than 2.0. (2) The woven or knitted fabric according to (1) above, wherein the polyolefin fiber is a polymer alloy fiber having an islands-in-sea structure with a polyolefin as a sea component and a polyester as an island component, and the dispersion diameter of the island components in the cross section of the fiber is 30 to 1,000 nm. (3) The woven or knitted fabric according to (1) or (2) above, characterized in that it contains a disperse dye. Effect of the Invention

[0010] According to the present invention, it is possible to provide a woven or knitted fabric made of polyolefin fibers of good quality, which is free from changes in feel due to yarn friction and changes in appearance due to light reflection. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention aims to provide a high-quality colored polyolefin fiber material for clothing, and the first requirement of the woven or knitted fabric of the present invention is that it contains polyolefin fibers at least in part and is colored with an L* of 90 or less. In the woven or knitted fabric made of colored polyolefin fibers, it is important in the present invention that the maximum color difference ΔE is less than 2.0, and if it is within this range, it is possible to provide a woven or knitted fabric with excellent quality as an apparel material, which requires strict control over the touch and appearance.

[0012] In a woven or knitted fabric made of colored polyolefin fibers, if the maximum color difference ΔE is less than 2.0, it means that the woven or knitted fabric is of good quality, with no change in touch due to thread friction or change in appearance due to light reflection. In other words, if the maximum color difference ΔE is less than 2.0, it means that the change in appearance is not easily visible, and the surface condition and amount of oil adhesion are uniform throughout the fabric, and the friction characteristics that are directly related to the feel on the skin, and the durability against rubbing in actual use and the kneading effect in home washing, etc. are uniform. Therefore, the maximum color difference ΔE is an important factor in the development of polyolefin fibers into clothing materials. This is because, compared to polyester fibers and nylon fibers that are generally developed as clothing materials, polyolefin fibers have low durability against rubbing and abrasion as a polymer characteristic, and it is important to manage the surface characteristics of this fabric.

[0013] In general, the friction characteristics of a fiber bundle are measured by preparing a drawn yarn from a woven or knitted fabric, and using a running friction coefficient measuring device, measuring the dynamic friction coefficient of the yarn running over a matte surface of a given surface roughness. The maximum dynamic friction coefficient difference, which is the difference between the maximum and minimum dynamic friction coefficients, can be used to determine local differences in feel and durability.

[0014] The present inventors have thoroughly studied woven and knitted fabrics made of polyolefin fibers and found that if the maximum dynamic friction coefficient difference (between yarn and matte finish) of the woven and knitted fabric is 0.05 or less, the tactile feel and wear resistance properties are improved, and the variation in tactile feel and appearance of the entire fabric is greatly reduced. The present invention is based on the finding that, in colored woven and knitted fabrics made of polyolefin fibers, this is correlated with the maximum color difference ΔE, and that the variation in tactile feel and appearance can be suppressed by making this maximum color difference ΔE less than 2.0.

[0015] In general, in woven and knitted fabrics made of synthetic fibers, oils added in the spinning process, yarn processing process, and weaving and knitting process are removed by scouring. However, in the case of woven and knitted fabrics containing polyolefin fibers, since the fabric surface has a high hydrophobicity as described above, the oils cannot be sufficiently removed by a general scouring process, and the amount of oil attached varies partially depending on the state and shape of the fabric to be treated, and the frictional properties and surface morphology of the fabric change due to slight variations in the amount of oil attached. In colored woven and knitted fabrics, the variations in frictional properties and surface morphology are considered to be recognizable as color differences, and in order to achieve the object of the present invention, it is important to make the maximum color difference ΔE less than 2.0. In addition, from the industrial viewpoint of producing woven and knitted fabrics made of polyolefin fibers, the present invention also has industrial convenience in that it does not require a complicated process of judging pass / fail using special evaluation equipment, and can be judged by a relatively simple color tone evaluation.

[0016] The maximum color difference ΔE referred to in the present invention is calculated by measuring CIE L*, a*, and b* five times at any measurement points on a woven or knitted fabric colored with an L* of 90 or less using a spectrophotometer and a color measurement light source, and then calculating the average value of each measurement point using the following formula. ΔE={(L*-L*') 2 +(a*-a*') 2 +(b*-b*') 2} 1 / 2 Here, ΔE is an index showing the difference in lightness and saturation of a color between any two points, and from the viewpoint of quality assurance, it is preferable that the ΔE of a woven or knitted fabric is small. ΔE tends to be large due to adhesion of oil to the woven or knitted fabric or uneven coloring of the coloring agent, but by keeping it below 2.0, a woven or knitted fabric of good quality will be obtained.

[0017] In dyeable polyolefin fibers in which a dyeing resin, which is the second component, is kneaded into the interior, the dyeing component has an affinity for oil, the oil has high permeability into the interior of the fiber bundle, and even a slight change in the oil adhesion rate may affect the quality, etc., so it is preferable to make the maximum color difference ΔE less than 1.5, and in this range, the change in appearance cannot be confirmed even with the naked eye, making it fully applicable as a material for clothing. Furthermore, from this perspective, it is more preferable to make the maximum color difference ΔE less than 1.0 in the entire fabric, and in this range, it has excellent uniformity in appearance and feel, can be used without problems as a material for clothing such as innerwear that comes into contact with human skin, and is suitable for application as a highly functional and comfortable innerwear that makes use of the soft feel and heat retention of polyolefin fibers.

[0018] The woven or knitted fabric of the present invention contains at least a portion of polyolefin fiber. That is, the fibers constituting the woven or knitted fabric of the present invention may be all polyolefin fibers, or may be a mixture of other fibers and polyolefin fibers to impart properties of the other fibers.

[0019] The polyolefin fiber of the present invention may be a fiber composed only of polyolefin, or may be a fiber composed of a composite component with a thermoplastic resin other than polyolefin, the main component of which is polyolefin. When composed of a composite component, the polyolefin content is preferably 80% by weight or more, and within this range, the light weight characteristic of polyolefin can be fully exhibited.

[0020] The polyolefins in the present invention include, but are not limited to, polyethylene, polypropylene, polybutene-1, polymethylpentene, etc. Among them, polypropylene has good moldability and excellent mechanical properties, and therefore can be used for clothing applications that require strict quality and grade.

[0021] The object of the present invention is to develop woven and knitted fabrics made of polyolefin fibers as clothing materials, and in this case, the fibers should be dyeable in a general dyeing process, and dyeable polyolefin fibers composited with a dyeable second component are preferably used. The dyeable polyolefin fibers in the present invention may be fibers in which a polyolefin is the main component and a dyeing component is composited, but from the viewpoint of being able to be produced in a simple production process and being able to pass through a high-level processing process, it is preferable that the fibers are polymer alloy fibers having a sea-island structure in which a polyolefin is the sea component and a dyeing component is the island component, and dyeable polyolefin fibers in which the island component is a dyeable thermoplastic resin can be spun into yarn by highly productive melt spinning and can be dyed with general-purpose dyes such as disperse dyes, so that they can be easily developed as clothing materials and the features of the present invention can be effectively utilized, and therefore, they can be mentioned as a more preferable range.

[0022] The polymer alloy fiber in the present invention is a fiber in which island components are discontinuously dispersed. Here, the island components being discontinuous means that the island components have an appropriate length in the fiber axis direction, and the shape of the sea-island structure in the cross section perpendicular to the fiber axis, i.e., the fiber cross section, is different at any interval within the same single fiber. The discontinuity of the island components in the present invention can be confirmed by the method described in the Examples section. Such a polymer alloy fiber can be obtained, for example, by molding a polymer alloy composition formed by kneading a polyolefin and a thermoplastic resin at any stage before the completion of melt spinning.

[0023] In the polymer alloy fiber of the present invention, it is preferable that the dyeable thermoplastic resin of the island component is exposed on the fiber surface. This is because, unlike a case in which a dyeable thermoplastic resin is disposed in the core of a sheath-core composite fiber or in the islands of a sea-island composite fiber, a fiber with higher color development can be obtained. Furthermore, the color development efficiency by light transmitted to the island component is improved, and vivid and deep color development can be realized.

[0024] When the polyolefin fiber of the present invention is made of a polymer alloy fiber, the island components constituting the sea-island structure are preferably dyeable thermoplastic resins, specific examples of which include, but are not limited to, polyester, polyamide, acrylic, etc. Among these, polyester is preferred because it has a short HSP distance with polypropylene calculated from the Hansen solubility parameter (HSP), which is an index of affinity, and has good dispersibility.

[0025] The polyester in the present invention includes, but is not limited to, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polylactic acid, or copolymer polyesters thereof. In particular, polyesters with low crystallinity or low refractive index are preferred for the purpose of improving the color development of the polyolefin fiber of the present invention.

[0026] Since dyes are less likely to be exhausted by crystalline portions but are more likely to be exhausted by amorphous portions, in order to improve the color development of the polyolefin fiber of the present invention, the lower the crystallinity of the polyester, the more preferable, and it is more preferable for the polyester to be amorphous.

[0027] In addition, when the refractive index of the polyester is reduced, the reflected light on the polyester surface is reduced, and the light penetrates sufficiently into the polyester, so that vivid and deep coloring can be imparted, and therefore the lower the refractive index of the polyester, the more preferable it is. As such a polyester, a copolymer polyester copolymerized with 10 to 100 mol % of cyclohexanedicarboxylic acid is preferable.

[0028] In the present invention, the copolymerized polyester is a polycondensate consisting of at least three or more components selected from dicarboxylic acid components and diol components. However, in the present invention, when all dicarboxylic acid components consist of only cyclohexanedicarboxylic acid, that is, when cyclohexanedicarboxylic acid is 100 mol%, even if the diol component is one or more types, it is considered to be included in the copolymerized polyester. The higher the copolymerization rate of cyclohexanedicarboxylic acid, the lower the refractive index of the copolymerized polyester and the improved color development of the polyolefin fiber, which is preferable. If the copolymerization rate of cyclohexanedicarboxylic acid is 10 mol% or more, the refractive index of the polyester is low and vivid and deep color development can be realized, which is preferable. In addition, if the copolymerization rate of cyclohexanedicarboxylic acid is 30 mol% or more, the polyester becomes amorphous, and more dye is absorbed into the polyester, which allows higher color development to be obtained, so it can be particularly preferably adopted.

[0029] In the present invention, the cyclohexanedicarboxylic acid may be any one of 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid, and may be used alone or in combination of two or more. Among them, 1,4-cyclohexanedicarboxylic acid is preferably used from the viewpoints of heat resistance and mechanical properties.

[0030] The dispersion diameter of the island components in the fiber cross section of the polyolefin fiber of the present invention is preferably 30 to 1000 nm. In the present invention, the dispersion diameter of the island components in the fiber cross section refers to a value measured by the method described in the Examples section. If the dispersion diameter of the island components in the fiber cross section is 30 nm or more, the dye is firmly incorporated into the thermoplastic resin of the island components, the coloring efficiency by the light transmitted to the island components is improved, and vivid and deep coloring can be realized, which is preferable. On the other hand, if the dispersion diameter of the island components in the fiber cross section is 1000 nm or less, the specific interfacial area of ​​the sea-island interface can be sufficiently increased, and therefore interfacial peeling and wear caused by it can be suppressed, and the quality is excellent, which is preferable.

[0031] The polymer alloy fiber of the present invention, in which the sea component is a polyolefin and the island components are a thermoplastic resin, may contain a compatibilizer as required for the purpose of improving the dispersibility of the thermoplastic resin of the island components in the polyolefin of the sea component, controlling the dispersion state, and improving the interfacial adhesion between the sea component and the island components. When forming a sea-island structure by melt spinning, a bulge called balus occurs just below the spinneret, and the thinning deformation of the fiber tends to become unstable. Therefore, a compatibilizer may be used for the purpose of improving the spinning operability, such as suppressing yarn breakage associated with this balus, and obtaining a high-quality fiber with small unevenness in fineness and excellent uniformity in the longitudinal direction of the fiber.

[0032] The compatibilizer in the present invention can be appropriately selected depending on the composite ratio of the polyolefin of the sea component and the thermoplastic resin of the island component, etc. The compatibilizer may be used alone or in combination of two or more kinds.

[0033] The polyolefin fiber of the present invention may be modified in various ways by adding secondary additives.Specific examples of secondary additives include, but are not limited to, plasticizers, antioxidants, ultraviolet absorbers, infrared absorbers, fluorescent whitening agents, release agents, antibacterial agents, nucleating agents, heat stabilizers, antistatic agents, coloring inhibitors, regulators, matting agents, defoaming agents, preservatives, gelling agents, latexes, fillers, inks, colorants, dyes, pigments, and fragrances.These secondary additives may be used alone or in combination of two or more.

[0034] The fineness of the polyolefin fiber of the present invention as a multifilament is not particularly limited and can be appropriately selected depending on the application and required properties, but is preferably 10 to 3000 dtex. The fineness in the present invention refers to a value measured by the method described in the Examples section. If the fineness of the polyolefin fiber is 10 dtex or more, it is preferable because there is little yarn breakage, good processability, less fuzz generation during use, and excellent durability. On the other hand, if the fineness of the polyolefin fiber is 3000 dtex or less, it is preferable because the flexibility of the fiber and fiber structure is not impaired.

[0035] 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 properties, but is preferably 0.5 to 20 dtex. The single fiber fineness in the present invention refers to the value obtained by dividing the fineness measured by the method described in the Examples section by the number of single fibers. If the single fiber fineness of the polyolefin fiber is 0.5 dtex or more, it is preferable because there is little yarn breakage, the processability is good, and the generation of fluff during use is small, resulting in excellent durability. On the other hand, if the single fiber fineness of the polyolefin fiber is 20 dtex or less, it is preferable because the flexibility of the fiber and the fiber structure is not impaired.

[0036] The elongation of the polyolefin fiber of the present invention is preferably adjusted by the manufacturing method described later depending on the application and required properties. Here, the elongation of the present invention refers to a value measured by the method described in the Examples section, and the higher the elongation, the less likely the fiber will be elongated and broken even when subjected to sudden deformation, but elongation during molding processing may cause the properties of the fiber product to become unstable, so in consideration of the handleability of the fiber, the elongation of the fiber of the present invention is more preferably 30 to 60%.

[0037] Furthermore, the elongation of the polyolefin fiber of the present invention may be adjusted according to the required elongation for its use, and it is particularly preferable to adjust it to 30 to 50% when used for clothing applications, and 20 to 40% when used for non-clothing applications.

[0038] The fineness variation value U%(hi) of the polyolefin fiber of the present invention is preferably 0.1 to 1.5%. The fineness variation value U%(hi) in the present invention refers to a value measured by the method described in the Examples section. The fineness variation value U%(hi) is an index of thickness unevenness in the longitudinal direction of the fiber, and the smaller the fineness variation value U%(hi), the smaller the thickness unevenness in the longitudinal direction of the fiber. The fineness variation value U%(hi) is preferably as small as possible from the viewpoint of processability and quality, but the lower limit of the manufacturable range is 0.1%. On the other hand, if the fineness variation value U%(hi) of the polyolefin fiber is 1.5% or less, the uniformity in the longitudinal direction of the fiber is excellent, fluff and thread breakage are unlikely to occur, and defects such as dyeing spots and dyeing streaks are unlikely to occur when dyed, and a high-quality fiber structure can be obtained, which is preferable.

[0039] The cross-sectional shape of the polyolefin fiber of the present invention is not particularly limited, and can be appropriately selected according to the application and required properties, and may be a perfect circular cross section or a noncircular cross section. Specific examples of noncircular cross sections include, but are not limited to, multi-lobed, polygonal, flat, elliptical, C-shaped, H-shaped, S-shaped, T-shaped, W-shaped, X-shaped, Y-shaped, square, hollow, etc.

[0040] The polyolefin fiber of the present invention is not particularly limited with respect to the fiber form, and may be in any form such as monofilament, multifilament, staple, or the like.

[0041] The polyolefin fiber of the present invention can be processed, such as by false twisting or twisting, in the same manner as ordinary fibers, and can also be woven or knitted in the same manner as ordinary fibers.

[0042] The woven or knitted fabric of the present invention is not particularly limited in its form, and may be woven, knitted, or pile fabric according to a known method. Any weaving or knitting structure may be used in the present invention, and plain weave, twill weave, satin weave, or variations thereof, warp knitting, weft knitting, circular knitting, lace knitting, or variations thereof may be suitably used. When making a fiber structure, the fiber structure may be combined with other fibers by interweaving or interweaving, or may be made into a fiber structure by mixing yarn with other fibers.

[0043] Next, the method for producing the polyolefin fiber and woven or knitted fabric of the present invention will be described below.

[0044] The polyolefin fiber of the present invention can be produced by a known melt spinning method, drawing method, or false twisting method.

[0045] In the present invention, it is preferable to dry the polyolefin, thermoplastic resin, and compatibilizer before melt spinning to make the water content 0.3% by weight or less. If the water content is 0.3% by weight or less, foaming due to moisture does not occur during melt spinning, and stable spinning can be performed, which is preferable. In addition, it is preferable because deterioration of mechanical properties and color tone due to hydrolysis is suppressed. The water content is more preferably 0.2% by weight or less, and even more preferably 0.1% by weight or less.

[0046] In the case of polymer alloy spinning, examples of the method of discharging from a spinneret to form a fiber thread include, but are not limited to, the following examples. As a first example, composite chips in which the sea component and island component are melt-kneaded in advance using an extruder or the like to homogenize the sea-island structure are dried as necessary, and then the chips are supplied to a melt spinning machine to be melted and metered with a metering pump. Thereafter, the chips are introduced into a heated spinning pack in a spinning block, and the molten polymer is filtered in the spinning pack, and then the chips are discharged from a spinneret to form a fiber thread. As a second example, the chips are dried as necessary, and the sea component and island component are mixed in the chip state, and then the mixed chips are supplied to a melt spinning machine to be melted and metered with a metering pump. Thereafter, the chips are introduced into a heated spinning pack in a spinning block, and the sea-island component of the molten polymer is kneaded and filtered in the spinning pack, and then the chips are discharged from a spinneret to form a fiber thread. As a third example, composite chips having a higher weight % of island components than the final fiber composition are dried as required, and then the composite chips and the sea component chips are separately fed and melted, and metered by a metering pump. Thereafter, the composite chips are introduced into a heated spinning pack in a spinning block, and the sea component chips of the molten polymer are kneaded and filtered in the spinning pack, and then discharged from a spinneret to form a fiber thread. As a fourth example, composite chips having a higher weight % of island components than the final fiber composition are dried as required, and then the composite chips and the sea component chips are mixed in the chip state, and then the mixed chips are fed into a melt spinning machine, where they are melted, and then measured by a metering pump. Thereafter, the composite chips are introduced into a heated spinning pack in a spinning block, and the sea component chips of the molten polymer are kneaded and filtered in the spinning pack, and then discharged from a spinneret to form a fiber thread.

[0047] The fiber yarn discharged from the spinneret is cooled and solidified by a cooling device, taken up by a first godet roller, and wound by a winder via a second godet roller to form a wound yarn. The tension during winding is preferably 0.05 to 0.10 cN / dtex. If the tension during winding is 0.05 cN / dtex or more, the tension between the second godet roller and the winder is sufficient, and stable winding can be performed, which is preferable. On the other hand, if the tension during winding is 0.10 cN / dtex or less, it is preferable because it can suppress deterioration of operability due to excessive rubbing of the yarn caused by high tension between the second godet roller and the winder, and changes in the physical properties of the inner layer and outer layer of the wound yarn due to shrinkage of the wound yarn over time. In addition, oil may be supplied to the fiber yarn using an oil supplying device, and entanglement may be imparted to the fiber yarn using an entanglement device.

[0048] The spinning temperature in melt spinning can be appropriately selected depending on the melting point and heat resistance of the polyolefin, thermoplastic resin, and compatibilizer, but is preferably 220 to 300°C. If the spinning temperature is 220°C or higher, the elongation viscosity of the fiber thread discharged from the spinneret is sufficiently reduced, so that the discharge is stable, and further, the spinning tension does not become excessively high, so that thread breakage can be suppressed, which is preferable. The spinning temperature is more preferably 240°C or higher. On the other hand, if the spinning temperature is 300°C or lower, it is preferable because the thermal decomposition during spinning can be suppressed, and the deterioration of the mechanical properties and coloring of the obtained polyolefin fiber can be suppressed. The spinning temperature is more preferably 260°C or lower.

[0049] The spinning speed in melt spinning can be appropriately selected depending on the composite ratio of polyolefin, thermoplastic resin, and compatibilizer, spinning temperature, etc., but in the case of the two-step method, it is preferably 1000 to 3000 m / min. In the case of the two-step method, the spinning speed is preferably 1000 m / min or more, because the running yarn is stable and yarn breakage can be suppressed. In the case of the two-step method, the spinning speed is more preferably 1500 m / min or more. On the other hand, in the case of the two-step method, the spinning speed is preferably 3000 m / min or less, because the spinning tension can be suppressed to perform stable spinning without yarn breakage, and the change in the physical properties of the inner layer and outer layer of the wound yarn due to the shrinkage of the wound yarn after spinning can be suppressed. In the case of the two-step method, the spinning speed is more preferably 2500 m / min or less. In the case of a one-step method in which spinning and drawing are performed simultaneously without winding, the spinning speed is preferably 1000 to 3000 m / min for the low-speed roller and 2500 to 6000 m / min for the high-speed roller. If the low-speed roller and the high-speed roller are within the above ranges, the running yarn is stabilized, yarn breakage can be suppressed, and stable spinning can be performed, which is preferable.

[0050] When drawing is performed by a one-step method or a two-step method, either a one-stage drawing method or a multi-stage drawing method having two or more stages may be used. The heating method in drawing is not particularly limited as long as it is an apparatus capable of directly or indirectly heating the running yarn.

[0051] The drawing temperature when drawing can be appropriately selected depending on the glass transition temperature or melting point of the polyolefin, thermoplastic resin, and compatibilizer, the strength and elongation of the fiber after drawing, etc., but is preferably 30 to 120 ° C. If the drawing temperature is 30 ° C or higher, the yarn to be supplied for drawing is sufficiently preheated, the thermal deformation during drawing is uniform, the occurrence of fineness unevenness can be suppressed, and a high-quality fiber with excellent uniformity in the fiber longitudinal direction can be obtained, which is preferable. On the other hand, if the drawing temperature is 120 ° C or lower, it is preferable because it is possible to suppress fusion and thermal decomposition of the fibers caused by contact with the heating roller, and the process passability and quality are good. In addition, it is preferable because the slippage of the fiber against the drawing roller is good, yarn breakage is suppressed, and stable drawing can be performed. It is more preferable that the drawing temperature is 90 ° C or lower. In addition, it is preferable to perform heat setting at 120 to 150 ° C. Heat setting at 120°C or higher is preferable because the heat-set fiber is sufficiently crystallized, and changes in the physical properties of the inner and outer layers of the fiber after drawing due to shrinkage over time can be suppressed. On the other hand, a heat setting temperature of 150°C or lower is preferable because fusion between the fibers and thermal decomposition can be suppressed, and the processability and quality are good.

[0052] The draw ratio when drawing can be appropriately selected depending on the elongation of the fiber before drawing and the strength and elongation of the fiber after drawing, but is preferably 1.02 to 5.0 times. A draw ratio of 1.02 times or more is preferable because mechanical properties such as the strength and elongation of the fiber can be improved by drawing. A draw ratio of 1.2 times or more is more preferable. On the other hand, a draw ratio of 5.0 times or less is preferable because thread breakage during drawing is suppressed and stable drawing can be performed. A draw ratio of 3.5 times or less is more preferable.

[0053] The stretching speed when stretching can be appropriately selected depending on whether the stretching method is a one-step method or a two-step method. In the case of a one-step method, the speed of the high-speed roller at the above spinning speed corresponds to the stretching speed. In the case of a two-step method, the stretching speed is preferably 100 to 1000 m / min. If the stretching speed is 100 m / min or more, the running yarn is stabilized and thread breakage is suppressed, which is preferable. On the other hand, if the stretching speed is 1000 m / min or less, thread breakage during stretching is suppressed and stable stretching can be performed, which is preferable.

[0054] When performing false twist processing, in addition to the so-called woolly processing, which uses only one heater, the so-called buleria processing, which uses both one and two heaters, can be appropriately selected.

[0055] The elongation of the undrawn or drawn yarn made of polyolefin fiber used in false twisting can be appropriately selected depending on the application and required properties, but is preferably in the range of 30 to 200%. If the elongation is 30% or more, fluffing of the false twisted yarn made of polyolefin fiber and the occurrence of yarn breakage during false twisting can be suppressed, and if the elongation is 200% or less, false twisting can be performed stably. From these viewpoints, the elongation of the undrawn or drawn yarn is more preferably 35 to 150%, and even more preferably 40 to 100%.

[0056] As an example of equipment used for false twist processing, a false twist processing device equipped with an FR (feed roller), 1DR (single draw roller) heater, cooling plate, false twist device, 2DR (two draw rollers), 3DR (three draw rollers), an entanglement nozzle, 4DR (four draw rollers), and a winder is given here.

[0057] The processing ratio between FR and 1DR can be selected according to the elongation of the fiber used in processing and the elongation of the false twist textured yarn made of polyolefin fiber, but is preferably in the range of 1.0 to 2.0.

[0058] The heater may be of a contact type or a non-contact type. The temperature of the heater can be appropriately selected depending on the stretch recovery rate and hot water dimensional change rate of the false twist textured yarn made of polyolefin fiber, but from the viewpoint of increasing the stretch recovery rate, in the case of a contact type, the temperature is preferably 90°C or higher, more preferably 100°C or higher, and even more preferably 110°C or higher. In the case of a non-contact type, the temperature is preferably 150°C or higher, more preferably 200°C or higher, and even more preferably 250°C or higher. The upper limit of the heater temperature may be any temperature at which the undrawn yarn or drawn yarn used does not fuse in the heater.

[0059] The false twist device is preferably a friction false twist type, and examples thereof include a friction disk type and a belt nip type. A friction disk type is preferred, and the disks are all made of ceramics, which is preferred because false twisting can be performed stably even during long-term operation. The ratios between 2DR-3DR and between 3DR-4DR can be appropriately set depending on the stretch recovery rate and hot water dimensional change rate of the false twist textured yarn made of polyolefin fiber, but are usually preferably 0.9 to 1.0 times. Between 3DR-4DR, entanglement may be provided by an entanglement nozzle, or additional oiling may be performed by an oiling guide in order to improve the high-order passability of the false twist textured yarn.

[0060] In the present invention, dyeing may be performed in either the fiber or woven / knitted fabric state, as required. Dyeing in the woven / knitted fabric state is preferable to dyeing in the fiber state, since a scouring step for removing oil is performed before the dyeing step. In the present invention, disperse dyes can be suitably used as the dye. Although the polyolefin of the sea component constituting the polyolefin fiber is hardly dyed, it is possible to obtain fibers and woven / knitted fabrics having vivid and deep color development by dyeing the thermoplastic resin of the island component.

[0061] The dyeing method in the present invention is not particularly limited, and a cheese dyeing machine, a liquid jet dyeing machine, a drum dyeing machine, a beam dyeing machine, a jigger, a high-pressure jigger, or the like can be suitably adopted in accordance with a known method.

[0062] In the present invention, there is no particular limitation on the dye concentration or dyeing temperature, and known methods can be suitably adopted. Furthermore, reduction washing may be carried out after dyeing, if necessary.

[0063] In the present invention, it is preferable to carry out a scouring treatment before dyeing. By carrying out the scouring treatment, it is preferable that the amount of oil applied in the spinning process, the yarn processing process, and further the weaving / knit processing process is kept uniform on the fabric surface, and it is more preferable that the oil is completely removed from the fabric surface.

[0064] Among the oils applied in the spinning process, yarn processing process, and even in the weaving and knitting process, mineral oils, which are mixed oils mainly composed of hydrocarbon compounds and which are the main components of the lubricating oils used in manufacturing machines in the weaving and knitting process, are paraffinic hydrocarbons, naphthenic hydrocarbons, aromatic hydrocarbons, etc., and have a high affinity with polyolefins, which are also hydrocarbons. If they adhere to the woven or knitted fabric of the present invention, they are difficult to remove by known scouring processes, and the amount of oil on the surface of the fabric becomes uneven.

[0065] The oil component applied in the production of the woven or knitted fabric of the present invention may contain fats and oils in addition to the mineral oil described above. The fats and oils are fatty acid esters of fatty acids and glycerin, and are included in oil agents applied for the purpose of bundling fibers in the spinning process, yarn processing, and also in the weaving and knitting process, mainly by an oiling device in the winding process or an oiling guide for additional oil in the false twisting process. Since fats and oils attached to the woven or knitted fabric can be easily removed by a saponification reaction with an alkali, the amount of fats and oils attached to the fabric surface can be easily maintained uniformly by using an alkali in the scouring process.

[0066] When the woven or knitted fabric of the present invention is scoured, it is preferable to use an aqueous scouring solution consisting of a surfactant and an alkali. The use of a surfactant in the scouring process is preferable because it is possible to keep the amount of oil adhering to the woven or knitted fabric uniform on the surface of the fabric. The use of an alkali in the scouring process is preferable because it is possible to saponify the oils and fats among the oils adhering to the woven or knitted fabric and easily remove them.

[0067] The surfactant used in the scouring treatment of the present invention is an amphiphilic substance having both hydrophilic and hydrophobic groups in the molecule, and examples of such surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants, but in the present invention, there is no particular limitation as long as the surfactant can penetrate into the woven or knitted fabric and then remove oil from the woven or knitted fabric. Note that only one type of surfactant may be used, or two or more types may be used in combination.

[0068] In the scouring treatment of the present invention, in order to maintain a uniform amount of oil adhesion on the fabric surface, the ΔE of the woven or knitted fabric of the present invention can be made less than 2.0 by adjusting the scouring treatment conditions, such as the penetration time of the surfactant aqueous solution into the woven or knitted fabric, the surfactant concentration of the surfactant aqueous solution, the number of scouring treatments, the scouring treatment bath ratio (weight ratio of the scouring aqueous solution to the weight of the woven or knitted fabric), and the temperature of the scouring aqueous solution.

[0069] The surfactant aqueous solution used in the scouring treatment of the woven or knitted fabric of the present invention preferably has a penetration time into the woven or knitted fabric of 2.6 seconds or less in a drop test following JIS L1907:2010 (drop method). Here, the penetration time of the surfactant aqueous solution into the woven or knitted fabric refers to the time from when a droplet of the surfactant aqueous solution diluted to a predetermined concentration is dropped onto the woven or knitted fabric until it is completely absorbed, and refers to the value measured by the method described in the Examples section. If the penetration time of the surfactant aqueous solution is 2.6 seconds or less, an interaction occurs between the hydrophobic group of the micelle molecule in the surfactant and the hydrophobic woven or knitted fabric, and the surfactant aqueous solution can easily penetrate into the woven or knitted fabric, which is preferable. If the penetration time of the surfactant aqueous solution is 2.3 seconds or less, it is more preferable.

[0070] The surfactant concentration of the surfactant aqueous solution used in the scouring treatment of the woven or knitted fabric of the present invention is preferably 3.0 g / L or more. However, the surfactant concentration refers to the weight of the surfactant relative to the scouring aqueous solution. If the surfactant concentration is 3.0 g / L or more, the oil will peel off from the woven or knitted fabric due to the interaction between the hydrophobic group of the micelle molecule in the surfactant and the oil attached to the woven or knitted fabric, and the amount of oil attached to the woven or knitted fabric can be kept uniform, which is preferable. The surfactant concentration is more preferably 5.0 g / L or more.

[0071] The surfactant used in the scouring treatment of the woven or knitted fabric of the present invention penetrates into the woven or knitted fabric, and then the oil is stripped from the woven or knitted fabric to remove the oil adhering to the woven or knitted fabric in a sequential process. Therefore, it is more preferable that the surfactant satisfy both the requirement that the time it takes for a droplet of aqueous surfactant solution to penetrate into the woven or knitted fabric of the present invention be 2.6 seconds or less in a drop test modeled after JIS L1907:2010 (drop method), and the requirement that the surfactant concentration be 3.0 g / L or more.

[0072] The number of times of scouring treatment of the woven or knitted fabric of the present invention is preferably 2 or more. If the number of scouring treatments is 2 or more, when the surfactant is inactivated by removing oil from the woven or knitted fabric during the first scouring treatment, a new surfactant can remove the oil remaining on the woven or knitted fabric of the present invention during the second or subsequent scouring treatments, which is preferable. The upper limit of the number of scouring treatments is not particularly limited as long as the amount of oil adhering to the woven or knitted fabric can be kept uniform on the surface of the fabric, but 5 times or less is preferable in consideration of productivity.

[0073] The bath ratio (weight ratio of the scouring aqueous solution to the weight of the woven or knitted fabric) when carrying out the scouring treatment of the woven or knitted fabric of the present invention is preferably 1:5 or more. A bath ratio of 1:5 or more allows the woven or knitted fabric of the present invention to be fully immersed in the scouring aqueous solution, and is preferable because the scouring aqueous solution penetrates uniformly throughout the woven or knitted fabric. A bath ratio of 1:30 or more is more preferable. There is no particular upper limit to the bath ratio, and it is determined depending on the condition of the equipment used for the scouring treatment.

[0074] The temperature of the aqueous scouring solution when carrying out the scouring treatment of the woven or knitted fabric of the present invention is preferably 45 to 100°C. If the temperature is 45°C or higher, the mobility of the micellar molecules in the surfactant is activated, and it is possible to remove oil from the woven or knitted fabric of the present invention, which is preferable. The temperature is more preferably 60°C or higher. If the temperature is 100°C or lower, the woven or knitted fabric of the present invention does not undergo excessive heat shrinkage, which is preferable from the viewpoint of the safety of the scouring process.

[0075] The alkali used in the scouring treatment of the woven or knitted fabric of the present invention is not particularly limited, and it is preferable that the alkali can remove the fats and oils from the oils adhering to the woven or knitted fabric of the present invention by a saponification reaction. Therefore, the alkali used in the scouring treatment of the present invention may be a weak alkali such as sodium carbonate, or a strong alkali such as sodium hydroxide to strengthen the scouring conditions.

[0076] The alkali concentration used in the scouring treatment of the woven or knitted fabric of the present invention is preferably 0.1 g / L or more. However, the alkali concentration refers to the weight of the alkali relative to the aqueous solution for scouring. If the alkali concentration is 0.1 g / L or more, it is preferable because the oils and fats contained in the oil adhering to the woven or knitted fabric of the present invention can be removed by saponification reaction. The alkali concentration is more preferably 0.5 g / L or more. There is no particular upper limit to the alkali concentration, and it is sufficient if it does not interfere with the handling of the aqueous solution for scouring.

[0077] In the present invention, the method for producing a woven or knitted fabric is not particularly limited, and a normal loom or knitting machine can be used. As a loom used for weaving, a generally used normal loom, rapier loom, water jet loom, air jet loom, etc. can be used without any particular limitation. In addition, when knitting, a commercially available knitting machine such as a circular knitting machine, a tricot machine, or a Raschel machine can be used.

[0078] Of the woven and knitted fabrics of the present invention, the form in the case of the woven fabric is not particularly limited, and preferred are woven fabrics such as plain, twill, satin, and plain double, twill double, warp double, back satin, etc. Preferred are circular knits such as plain, milling, and punch, and warp knits such as tricot, half, and denbigh, etc.

[0079] The woven and knitted fabrics of the present invention can be used for clothing applications and applications requiring light weight and color development, in addition to applications in which conventional polyolefin fibers are used. Applications in which conventional polyolefin fibers are used include, but are not limited to, interior applications such as tile carpets, household rugs, and car mats, bedding such as batting for futons and pillow filling materials, and materials applications such as ropes, protective nets, filter cloths, narrow tapes, braided cords, and upholstery. Furthermore, applications that can be expanded by the present invention include, but are not limited to, general clothing such as women's clothing, men's clothing, linings, underwear, down, vests, innerwear, and outerwear, sports clothing such as windbreakers, outdoor wear, ski wear, golf wear, and swimsuits, bedding such as futon covers, blankets, blanket covers, blanket covers, pillow covers, and sheets, interiors such as tablecloths and curtains, and materials such as belts, bags, sewing threads, sleeping bags, and tents. EXAMPLES

[0080] The present invention will be described in more detail below with reference to examples. The property values ​​in the examples were determined by the following methods.

[0081] A. Composite ratio The total amount of the sea component, island component and compatibilizer used as the raw materials for the polyolefin fiber was set to 100 parts by weight, and the composite ratio was calculated as sea component / island component / compatibilizer [parts by weight].

[0082] B. Fineness 100 m of the fiber obtained in the examples was spooled using an INTEC electric measuring machine under an environment of 20° C. temperature and 65% RH. The weight of the spool obtained was measured, and the fineness (dtex) was calculated using the following formula. Fineness (dtex) = weight of 100m of fiber (g) x 100 The measurement was carried out five times for each sample, and the average value was regarded as the fineness.

[0083] C. Strength, elongation The strength and elongation were calculated according to JIS L1013:2010 (chemical fiber filament yarn test method) 8.5.1 using the fibers obtained in the examples as samples. A tensile test was performed using an Orientec Tensilon UTM-III-100 model under conditions of a temperature of 20°C and a humidity of 65% RH, with an initial sample length of 20 cm and a tensile speed of 20 cm / min. The strength (cN / dtex) was calculated by dividing the stress (cN) at the point showing the maximum load by the fineness (dtex), and the elongation (%) was calculated according to the following formula using the elongation (L1) at the point showing the maximum load and the initial sample length (L0). Elongation (%)={(L1-L0) / L0}×100 The measurement was carried out 10 times for each sample, and the average values ​​were used as the strength and elongation.

[0084] D. Toughness The toughness was calculated using the strength (cN / dtex) and elongation (%) calculated in section C above according to the following formula. Toughness = Strength x Elongation 0.5} E. Fineness fluctuation value U%(hi) The fineness fluctuation value U%(hi) was measured using the fibers obtained in the examples as samples, with a Zellweger Worster Worster tester 4-CX, under the conditions of a measurement speed of 200 m / min, a measurement time of 2.5 minutes, a measurement fiber length of 500 m, and a twist number of 12000 / m (S twist), to measure U%(half inert). The measurement was performed five times for each sample, and the average value was taken as the fineness fluctuation value U%(hi).

[0085] F. Island component dispersion diameter, island component discontinuity The fibers obtained in the examples were embedded in epoxy resin, and then cut in a direction perpendicular to the fiber axis together with the epoxy resin using an LKB ultramicrotome LKB-2088 to obtain ultrathin sections with a thickness of about 100 nm. The obtained ultrathin sections were stained by holding them in a gas phase of ruthenium tetroxide at room temperature for about 4 hours, and then the stained surface was cut with an ultramicrotome to prepare ultrathin sections stained with ruthenium tetroxide. The stained ultrathin sections were observed in a cross section perpendicular to the fiber axis, i.e., the fiber cross section, using a Hitachi transmission electron microscope (TEM) H-7100FA model at an accelerating voltage of 100 kV, and micrographs of the fiber cross section were taken. Observations were performed at magnifications of 300x, 500x, 1000x, 3000x, 5000x, 10000x, 30000x, and 50000x, and the lowest magnification at which more than 100 island components could be observed was selected when taking the micrographs. The diameters of 100 island components randomly extracted from the same photograph were measured using image processing software (WINROOF, manufactured by Mitani Shoji), and the average value was taken as the island component dispersion diameter (nm). Since island components present in the fiber cross section are not necessarily perfect circles, when they are not perfect circles, the diameter of the circumscribed circle was adopted as the island component dispersion diameter.

[0086] When the number of island components present in the fiber cross section of a single yarn was less than 100, the fiber cross section of a plurality of single yarns produced under the same conditions was used as a sample and observed. When taking a microscopic photograph, the highest magnification at which the entire image of the single yarn could be observed was selected. For the photographs taken, the dispersed diameter of the island components present in the fiber cross section of each single yarn was measured, and the average value of the dispersed diameters of a total of 100 island components was taken as the dispersed diameter of the island components.

[0087] Regarding the discontinuity of island parts, five micrographs of the fiber cross section were taken at an arbitrary interval of at least 10,000 times the diameter of the single fiber within the same single fiber. If the number of island parts and the shape of the sea-island structure in each fiber cross section were different, the island parts were judged to be discontinuous. If the island parts were discontinuous, it was rated as "Y", and if the island parts were not discontinuous, it was rated as "N".

[0088] G. Maximum color difference ΔE The fibers were used as samples, and a cylindrical knit was produced using an Eiko Sangyo circular knitting machine NCR-BL (3.5 inch (8.9 cm) diameter, 27 gauge). Three drops of Shell Clean Knit Oil 22, a lubricant for weaving and knitting manufacturing machines, made by Shell Lubricants Japan, were dropped and allowed to penetrate the knit for 30 minutes. The cylindrical knit was scoured with a scouring aqueous solution containing a specified concentration of sodium carbonate and a surfactant, washed with running water for 30 minutes, and dried in a hot air dryer at 60°C for 60 minutes. The dried cylindrical knit was dyed at a bath ratio of 1:40 at 130°C for 45 minutes in a dyeing solution containing 3% by weight of BLUE NFB GR made by TERATOP as a blue disperse dye and 1 g / L of IONET RAP-250 made by Sanyo Chemical Industries as a leveling dye, and the pH was adjusted to 5.0. The dye was then washed with running water for 30 minutes and dried in a hot air dryer at 60°C for 60 minutes. After dyeing, the tubular knit was washed with an alkaline solution containing 0.6g / L sodium hydroxide in a bath ratio of 1:40 at 80℃ for 20 minutes, then rinsed with running water for 30 minutes and dried in a hot air dryer at 60℃ for 60 minutes. The dried tubular knit was used as a sample and L*, a*, and b* were measured using a spectrophotometer CM-700d / 600d and a colorimetric illuminant D65. Color measurements were performed five times each on an area where clean knit was not applied and an area where clean knit was applied, and the maximum color difference ΔE was calculated from the average value for each area using the following formula. ΔE={(L*-L*') 2 +(a*-a*') 2 +(b*-b*') 2} 1 / 2 Average value of measured values ​​of clean knit untreated areas L*, a*, b* Average values ​​of the measured values ​​of the clean knit drip points L*', a*', b*' H. Penetration time of surfactant solution A dropping test was carried out according to JIS L1907:2010 (dropping method) on the cylindrical knitted sample (200mm x 200mm) after the scouring treatment obtained by the above item G. With the tip of a burette fixed 10cm above the cylindrical knitted fabric, one drop of a surfactant aqueous solution adjusted to a predetermined surfactant concentration was dropped from the burette, and the time until the drop was completely absorbed by the cylindrical knitted fabric was measured to evaluate the permeability of the surfactant aqueous solution into the cylindrical knitted fabric. I. Dye difference (color spots at the dripping points of clean knit) The dyed tube knit obtained in accordance with item G above was visually inspected to see whether the area where the clean knit was dripped was dyed dark or light. If there was no difference in dyeing compared to the area where the oil was not dripped, it was rated "good", and if there was a difference, it was rated "poor".

[0089] J. Maximum dynamic friction coefficient difference between yarn and texture The dyed tube-knitted fabric obtained in the above item G was subjected to yarn removal, and the dynamic friction coefficient was measured for 10 seconds using an Eiko Sangyo silk-making running friction coefficient measuring device ME-TM1 under the conditions of a surface roughness of 20μ, a yarn-to-pear texture intersection count of 1 time, and a yarn speed of 55 m / min. The difference between the maximum and minimum measured dynamic friction coefficients was taken as the maximum dynamic friction coefficient difference (μd).

[0090] K. Tactile difference The dyed tube-knitted products obtained according to item G above were evaluated on a four-level scale of S, A, B, and C by a consensus of five inspectors with over five years' experience in judging quality. S indicates the best quality, followed by A, B, and C, with C being the worst quality. S indicates "no noticeable difference in texture, extremely excellent quality," A indicates "almost no noticeable difference in texture, excellent quality," B indicates "slightly noticeable difference in texture, poor quality," and C indicates "a noticeable difference in texture, extremely poor quality," with A and above "almost no noticeable difference in texture, excellent quality" being considered a pass. [Example 1] The mixture was mixed with 89.0 wt% of polypropylene (PP) (PP3155E5 manufactured by ExxonMobil, melting peak temperature 163°C, MFR 36g / 10min) as the sea component, 10.0 wt% of polyethylene terephthalate copolymerized with 35 mol% of 1,4-cyclohexanedicarboxylic acid as the island component, and 1.0 wt% of styrene-butadiene-butylene-styrene copolymer having amino groups as functional groups as a compatibilizer (Tuftec (registered trademark) MP10 manufactured by Asahi Kasei) at a mixing temperature of 230°C using a twin-screw extruder. The strand discharged from the twin-screw extruder was cooled with water and cut into about 5 mm length using a pelletizer to obtain composite chips. The obtained composite chip was vacuum dried at 90 ° C for 12 hours, and then fed to an extruder-type melt spinning machine to melt it, and discharged from a spinneret (discharge hole diameter 0.20 mm, discharge hole length 0.50 mm, number of holes 48, round hole) at a spinning temperature of 240 ° C and a discharge rate of 28.0 g / min to obtain a spun yarn. This spun yarn was cooled with cooling air at an air temperature of 20 ° C and an air speed of 25 m / min, and an oil agent was applied by an oiling device to converge it, and it was taken up by a first godet roller rotating at 2000 m / min, and it was taken up by a winder through a second godet roller rotating at the same speed as the first godet roller to obtain an undrawn yarn of 140 dtex-48f. The obtained undrawn yarn was drawn under the conditions of a first hot roller temperature of 60 ° C, a second hot roller temperature of 140 ° C, and a draw ratio of 2.0 times to obtain a drawn yarn of 70 dtex-48f. Next, the drawn yarn was false-twisted using a draw-twisting device equipped with an FR (feed roller), 1DR (1 draw roller), heater, cooling plate, false-twist device, 2DR (2 draw rollers), 3DR (3 draw rollers), entanglement nozzle, 4DR (4 draw rollers), and a winder to obtain a 56dtex-48f false-twisted yarn made of polyolefin fiber. The conditions for the false-twisting process were as follows: FR speed: 240m / min, processing ratio between FR and 1DR: 1.05 times, processing ratio between 1DR and 2DR: 1.28 times, hot plate type contact heater (length 110mm) 145℃, cooling plate length: 65mm, friction disk type friction false-twist device, 2DR-3DR ratio: 1.0 times, 3DR-4DR ratio: 0.98 times, 4DR-winder ratio: 0.95 times, and entanglement was given between 3DR and 4DR by an entanglement nozzle.

[0091] After making a cylindrical knitted fabric from the obtained fibers, three drops of Shell Clean Knit Oil 22 manufactured by Shell Lubricants Japan were dropped at 5 cm intervals from the left end of the grey fabric and allowed to penetrate into the knitted fabric for 30 minutes. After that, the fabric was scoured for 20 minutes in an aqueous solution containing 1.0 g / L sodium carbonate and 5.0 g / L of Meisei Chemical Industry's surfactant Grand Up US-20 (a mixture of nonionic and anionic surfactants), at a bath ratio of 1:40, at a temperature of 80°C, washed with running water for 30 minutes, and dried in a hot air dryer at 60°C for 60 minutes. After that, a second scour was performed under the same conditions, and the fabric properties were evaluated according to the examples.

[0092] When the scouring treatment was carried out under the above conditions, the oil could be removed from the cylindrical knitted fabric, and the maximum color difference ΔE was less than 2.0. Furthermore, as a result of the feel test, the cylindrical knitted fabric had no difference in feel at all, and was a knitted fabric of extremely high quality. The evaluation results of the fiber properties and fabric properties of the obtained fiber are shown in Table 1.

[0093] [Comparative Example 1, Example 2] The procedure of Example 1 was repeated except that the surfactant concentration was 1.0 g / L (Comparative Example 1) and 3.0 g / L (Example 2). The results are shown in Table 2.

[0094] In Comparative Example 1, the amount of oil adhering to the surface of the fabric was uneven because there was a shortage of surfactant to remove the oil from the tubular knit, and the maximum color difference ΔE of the tubular knit was 3.41. As a result, there was a dye difference and a large difference in the feel inside the tubular knit.

[0095] In Example 2, the amount of oil adhering to the surface of the tubular knit was uniform because there was a sufficient amount of surfactant to remove the oil from the tubular knit, and the maximum color difference ΔE was 0.78. Therefore, there was no difference in dyeing or texture.

[0096] [Comparative Examples 2 and 3, Example 3] The same procedures as in Example 1 were repeated except that the surfactant was changed to Sunmol (a mixture of a nonionic surfactant and an anionic surfactant) manufactured by Nicca Chemical Industry Co., Ltd., and the surfactant concentration was changed to 1.0 g / L (Comparative Example 2), 3.0 g / L (Comparative Example 3), and 5.0 g / L (Example 3). The results are shown in Table 2.

[0097] In Comparative Examples 2 and 3, the surfactant penetration time was 2.6 seconds or more, and it was difficult for the surfactant to penetrate into the tubular knit, so the oil was difficult to remove from the tubular knit and the amount of oil attached to the fabric surface was uneven. The maximum color difference ΔE was 4.21 (Comparative Example 2) and 3.74 (Comparative Example 3), resulting in dye differences and large differences in texture within the tubular knit.

[0098] In Example 3, the penetration time of the surfactant aqueous solution was 2.6 seconds or less, and the surfactant aqueous solution easily penetrated into the tubular knitted fabric, so the amount of oil attached to the fabric surface was uniform, and the maximum color difference ΔE was 1.02. Therefore, there was no difference in dyeing or texture.

[0099] [Comparative Examples 4 to 6] The same procedures as in Example 1 were repeated except that the number of scouring treatments was one and the surfactant concentrations were 1.0 g / L (Comparative Example 4), 3.0 g / L (Comparative Example 5), and 5.0 g / L (Comparative Example 6). The results are shown in Table 2.

[0100] In Comparative Examples 4 to 6, the surfactant was inactivated before it could uniformly attach the amount of oil to the fabric surface because the scouring treatment was performed only once, and the amount of oil attached was prone to become non-uniform. As a result, the maximum color difference ΔE was 6.01 (Comparative Example 4), 5.23 (Comparative Example 5), and 4.81 (Comparative Example 6), resulting in dye differences and large differences in texture within the tubular knitting.

[0101] [Examples 4 and 5] The procedure of Example 1 was repeated except that the liquor ratio was 1:20 (Example 4) and 1:30 (Example 5). The results are shown in Table 2.

[0102] In Examples 4 and 5, the bath ratio was reduced, but the bath ratio was still 1:5 or more, allowing the tubular knit to be fully immersed in the scouring aqueous solution, and the scouring aqueous solution penetrated the entire tubular knit uniformly, so the amount of oil adhering to the tubular knit surface was uniform, and the maximum color difference ΔE was 0.57 (Example 4) and 0.51 (Example 5). Therefore, no difference in dyeing or texture occurred.

[0103] [Comparative Example 7, Example 6] The same procedures as in Example 1 were repeated except that the temperature was 40° C. (Comparative Example 7) and 60° C. (Example 6).

[0104] In Comparative Example 7, the temperature was 40°C, and the micellar molecules in the surfactant were not easily activated, so the amount of oil attached to the fabric surface was easily uneven. As a result, the maximum color difference ΔE was 2.46, and there was a dye difference, and the touch difference within the tubular knitting was also large. The results are shown in Table 2.

[0105] In Example 6, the temperature was 60°C, and the micellar molecules in the surfactant were easily activated, so the amount of oil attached to the fabric surface was uniform, and the maximum color difference ΔE was 0.78. Therefore, there was no difference in dyeing or touch.

[0106] [Example 7] The same procedures as in Example 1 were repeated except that the alkali concentration in the scouring aqueous solution was 0.5 g / L. The results are shown in Table 2.

[0107] In Example 7, even though the alkali concentration was reduced to 0.5 g / L, the oil contained in the oil adhering to the tubular knitted fabric could be removed by saponification, so the amount of oil adhering to the fabric surface was uniform and the maximum color difference ΔE was 0.39. Therefore, there was no difference in dyeing or texture.

[0108] [Table 1]

[0109] [Table 2] [Industrial Applicability]

[0110] It is possible to provide a polyolefin woven or knitted fabric of good quality having vivid and deep coloring and no difference in touch. The polyolefin woven or knitted fabric obtained by the present invention can be suitably used in a wide range of applications requiring light weight and coloring, as well as in interior and material applications in which conventional polyolefin fibers are used.

Claims

1. A woven or knitted fabric which contains at least a portion of a polyolefin fiber and is colored to have an L* of 90 or less, and which has a maximum color difference ΔE of less than 2.

0.

2. 2. The woven or knitted fabric according to claim 1, wherein the polyolefin fiber is a polymer alloy fiber having an island-sea structure in which a polyolefin is a sea component and a polyester is an island component, and the dispersion diameter of the island components in the fiber cross section is 30 to 1,000 nm.

3. 3. The woven or knitted fabric according to claim 1, further comprising a disperse dye.

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