JP7135469B2 - Woven or knitted fabric using eccentric core-sheath composite fiber - Google Patents

Description

TECHNICAL FIELD The present invention relates to a woven or knitted fabric using an eccentric core-sheath composite fiber.

Fibers using thermoplastic polymers such as polyesters and polyamides have various excellent properties such as mechanical properties and dimensional stability. Therefore, it is used in various fields such as clothing, interiors, vehicle interiors, and industrial materials. On the other hand, with the diversification of uses of fibers, the properties required thereof have also become diversified.

Especially in recent years, there has been a demand for restraint of feeling of restraint when worn and followability of movements, and there is a high demand for stretch performance, including clothes. In addition, as additional functions, multiple functions such as aesthetics, texture, lightness, bulkiness, and color development are required. high demand for Various methods for imparting stretch to raw yarns constituting woven or knitted fabrics have also been proposed so far. For example, there is a method of subjecting fibers to false twisting to impart stretchability to woven or knitted fabrics. However, the resulting woven fabric does not have sufficient stretchability.

There is also a method in which polyurethane fibers having rubber elasticity are mixed in the woven fabric to impart stretchability. However, there are problems such as poor color fastness, susceptibility to discoloration and color transfer, increased weight of the fabric, excessive thickness of the fabric, and deterioration of strength over time.

As a method that does not use polyurethane fibers or false twisted yarns, woven or knitted fabrics of fibers exhibiting latent crimp using side-by-side composite yarns have been proposed. A latent crimp-developing fiber is a fiber that has the ability to develop crimps by heat treatment, or to develop finer crimps than before heat treatment. It is distinguished from processed yarn such as.

For example, Patent Literature 1 proposes a latently crimpable conjugate fiber that is a conjugate fiber obtained by laminating two components of polymers having different viscosities in a side-by-side manner. When such latently crimpable conjugate fibers are used, the fibers are largely curved toward the high-shrinkage component side after heat treatment, so that the continuation of the fibers results in a three-dimensional spiral structure. Therefore, the structure expands and contracts like a spring, so that stretchability can be imparted to the woven or knitted fabric. Since these side-by-side type composite fibers have a special cross section, they are difficult to spin, and it is difficult to reduce the fineness of single filaments. Therefore, woven or knitted fabrics obtained from fibers having a bimetallic structure still have the problem that they have a hard texture.

Furthermore, in Patent Document 1, since it is a simple bonded structure, there is a problem that peeling occurs at the interface due to friction or impact, and the quality of the woven or knitted product is lowered due to whitening in white streaks and fluffing. there were.

Patent Document 2 proposes an actual crimpable conjugate fiber in which the center of gravity of the second component is deviated from the center of gravity of the fiber in the fiber cross section of the conjugate fiber containing the first component and the second component. In a fiber with such a cross section, bending of the fiber during ejection in the spinning process can be suppressed, but due to the constraints of the composite spinning method, the viscosity difference between both sides of the fiber cross section must be reduced. crimp tends to be inferior to the side-by-side type cryptically or overtly crimped conjugate fiber. Therefore, the simple eccentric core-sheath composite fiber with crimp expression is inferior in terms of stretch performance, which is the key, and it is difficult to say that the material has satisfactory stretch performance. Further, there is a problem that wrinkles and streaks occur due to crimp spots caused by a slight displacement of the position of the eccentric core component. Furthermore, when the eccentric core-sheath composite fiber has a fine fineness, there is a problem that the stretchability is further deteriorated.

Japanese Patent Application Laid-Open No. 09-157941 (Claims) JP 2016-106188 A (Claims) Japanese Patent Application Laid-Open No. 2002-339169 (Claims) Japanese Patent Application Laid-Open No. 2002-061031 (Claims)

The present invention overcomes the problems of the prior art, and relates to a woven or knitted fabric having sufficient stretchability and softness, and having good quality without wrinkles or streaks.

The above problems are solved by the following means.
(1) In the cross section of the eccentric core-sheath composite fiber composed of two polymers, the A component and the B component, the A component is completely covered with the B component, and the minimum thickness of the B component covering the A component. The ratio S/D of the thickness S to the fiber diameter D is 0.01 to 0.1, and the peripheral length of the fiber in the portion where the thickness is within 1.05 times the minimum thickness S is 1/ of the peripheral length of the entire fiber. A woven or knitted fabric at least partially using an eccentric core-sheath composite fiber of 3 or more.
(2) The A component is completely covered with the B component in the cross section of the false twisted eccentric core-sheath composite fiber consisting of two types of polymers, the A component and the B component, covering the A component. The ratio S/D of the minimum thickness S of the thickness of the B component to the fiber diameter D is 0.01 to 0.2, and the peripheral length of the fiber in the portion within 1.10 times the minimum thickness S is the entire fiber. A woven or knitted fabric in which at least a part of the eccentric core-sheath composite fiber having a circumference of 1/3 or more is used.
(3) The woven or knitted fabric according to (1) or (2), wherein the eccentric core-sheath composite fiber has an expansion ratio of 20 to 70%.
(4) The woven or knitted fabric according to any one of (1) to (3), wherein the eccentric core-sheath composite fiber has a single filament fineness of 1.0 dtex or less and a fineness unevenness (U%) of 1.5% or less.
(5) The woven or knitted fabric according to any one of (1) to (4), which has an elongation rate of 15% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp direction and the weft direction.
(6) The woven or knitted fabric according to any one of (1) to (5), which has an elongation recovery rate of 75% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp direction and the weft direction.
(7) The woven or knitted fabric according to any one of (1) to (6), which has an abrasion resistance (JIS L 1096 E method grade 3 discoloration) of 2000 times or more.
(8) The woven or knitted fabric according to any one of (1) to (7), wherein the eccentric core-sheath composite fiber does not contain a sea-island elution component.
(9) The woven or knitted fabric has an air permeation rate of 1 cc/cm ² /sec. The woven or knitted fabric according to any one of the following fabrics (1) to (8).
(10) The woven or knitted fabric has an air permeation rate of 30 cc/cm ² /sec. The woven or knitted fabric according to any one of (1) to (8), which is the following knitted fabric.
(11) The woven or knitted fabric according to any one of (1) to (9), which has a water pressure resistance of 1000 mmH ₂ O (9.8 kPa) or more.
(12) The woven or knitted fabric according to any one of (1) to (11), wherein the eccentric core-sheath composite fiber is contained in the woven or knitted fabric in an amount of 25% by weight or more.
(13) Water absorption time is 5 sec. The woven or knitted fabric according to any one of (1) to (8) and (12) below.

By using the eccentric core-sheath composite fiber specified in the present invention, it is possible to provide a woven or knitted fabric having sufficient stretchability, softness, and good quality without wrinkles or streaks. This woven or knitted fabric can be applied to a wide range of fields including clothing, clothing materials, and industrial materials, and can be produced efficiently and at low cost.

FIG. 1 is a drawing-substituting photograph showing an example of a fiber cross-section of the eccentric core-sheath composite fiber of the present invention. FIG. 2 is an example of the eccentric core-sheath composite fiber of the present invention, and is a cross section of the fiber for explaining the position of the center of gravity in the cross section of the fiber. FIG. 3 is a fiber cross section for explaining the fiber diameter (D) and the minimum thickness (S) in the fiber cross section of the eccentric core-sheath composite fiber and composite yarn of the present invention. FIG. 4 is a fiber cross section for explaining the IFR (curvature radius of the interface between the A component and the B component in the fiber cross section) in the fiber cross section of the eccentric core-sheath composite fiber of the present invention.

The present invention will be described in detail below along with preferred embodiments.

The eccentric core-sheath composite fiber used in the present invention has a fiber cross section composed of two types of polymers, the A component and the B component. As the polymer referred to here, a fiber-forming thermoplastic polymer is preferably used. In view of the object of the present invention, the combination of components A and B includes (1) a combination of polymers that cause a difference in shrinkage when subjected to heat treatment, and (2) a difference in melt viscosity of 10 Pa s or more between the polymers to be combined. Combinations of polymers with varying degrees of molecular weight and/or composition are suitable, and the like.

Suitable polymers for the purposes of the present invention include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamides, polylactic acid, thermoplastic polyurethanes, polyphenylene sulfide, polyethylene, polypropylene.

When the A component and the B component are combined with different molecular weights, the molecular weights of the polymers used, such as the suitable polymers exemplified above, are changed, and the A component shown in FIG. Polymers can be used. When different compositions are combined for the A component and the B component, one component can be used as a homopolymer and the other component can be used as a copolymer.

Further, for combinations with different polymer compositions, for example, component A/component B includes polybutylene terephthalate/polyethylene terephthalate, polytrimethylene terephthalate/polyethylene terephthalate, thermoplastic polyurethane/polyethylene terephthalate, polytrimethylene terephthalate/polybutylene terephthalate, and the like. Various combinations are mentioned. Good bulkiness due to the spiral structure can be obtained in these combinations.

In particular, polyester, polyamide, polypropylene, and the like are preferably used, and among them, polyester is more preferable because it also has mechanical properties and the like. The polyester referred to here is preferably polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, copolymers thereof with a dicarboxylic acid component, diol component or oxycarboxylic acid component, or blends of these polyesters. mentioned.

These polymers may optionally contain inorganic fine particles, organic compounds, carbon black as matting agents such as titanium oxide, flame retardants, lubricants, antioxidants, coloring pigments, etc., to the extent that the objects of the present invention are not impaired. can be included.

In the eccentric core-sheath composite fiber of the present invention, the composite area ratio of the A component and the B component in the fiber cross section can be reduced by increasing the ratio of the high shrinkage component or the high molecular weight polymer, which is the A component, in view of the appearance of crimp. A spiral structure can be easily realized. In order to further improve the physical properties of the eccentric core-sheath composite fiber, the ratio of both components is preferably in the range of A component:B component = 70:30 to 30:70 (area ratio), 65:35 to 45. :55 range is more preferred.

In the present invention, the eccentric core-sheath composite fiber to be used has a composite cross-section formed by bonding two different polymers, and the two polymers having different polymer properties are bonded without being substantially separated. It is an eccentric sheath-core type in which the A component completely covers the B component.

Here, eccentricity as used in the present invention means that the position of the center of gravity of the A component polymer is different from the cross-sectional center of the conjugate fiber in the cross section of the conjugate fiber. A specific description will be given below with reference to FIG. In FIG. 2, the horizontal hatching is the B component, the 30-degree hatching (slanting lines rising to the right) is the A component, the center of gravity of the A component in the cross section of the composite fiber is the center of gravity a, and the center of gravity of the cross section of the composite fiber is the center of gravity point C. is.

In the eccentric core-sheath composite fiber used in the present invention, the separation of the center of gravity a from the center of gravity C of the cross section of the composite fiber (eccentricity) allows the fiber to bend greatly toward the high-shrinkage component side after heat treatment. As the high-shrinkage component shrinks relatively more strongly than the low-shrinkage component, the eccentric core-sheath composite fiber continues to bend in the fiber axis direction. As a result, the eccentric core-sheath composite fiber has a three-dimensional spiral structure and exhibits excellent crimp. Here, the further the center of gravity is, the more favorable the crimp is and the better the stretching performance can be obtained.

In the present invention, since the A component completely covers the B component, even if the woven or knitted fabric is subjected to friction or impact, whitening or fluffing will not occur, so that the quality of the woven or knitted fabric can be maintained. In addition, high-molecular-weight polymers, high-elasticity polymers, and the like, which are exposed on the surface of the conjugate fiber in the conventional simple bonded structure, can be used as one of the components of the conjugate fiber.

Furthermore, in the case of a side-by-side type conjugate yarn, if the single yarn fineness is made thinner, the spinning performance becomes worse, and the single yarn fineness is limited to about 1.2 dtex. However, due to the structure in which the A component completely covers the B component, the spinnability was improved, and it became possible to make the single yarn fineness finer than 1.0 dtex.

In the eccentric core-sheath composite fiber used in the present invention, the ratio S/D of the minimum thickness S of the B component covering the A component to the fiber diameter (diameter of the composite fiber) D is 0.01 to 0.1. and preferably from 0.02 to 0.08.

Within this range, deterioration of the quality of the woven or knitted fabric due to fluff or the like can be suppressed, and sufficient crimp development force and stretchability can be obtained. Here, crimped yarn is originally able to obtain good stretch performance because each polymer is in contact only at the bonding interface. descend. However, as a result of intensive studies by the present inventors, it has become possible to obtain a conjugate fiber that satisfies both stretch performance and abrasion resistance by setting the thickness of component B within the range specified in the present invention. .

A more detailed explanation will be given using the fiber cross section shown in FIG. Here, the minimum thickness S is the thinnest portion of the B component in the core-sheath composite fiber.

Furthermore, it is important that the portion having a thickness within 1.05 times the minimum thickness S (hereinafter sometimes referred to as the "minimum thickness portion") occupies 1/3 or more of the entire perimeter of the conjugate fiber. This means that the A component exists along the contour of the fiber, and compared with the conventional eccentric core-sheath composite fiber with the same area ratio, the present invention has the center of gravity of each component in the fiber cross section. The positions are farther apart, forming fine spirals and developing good crimps.

More preferably, the perimeter of the thickness within 1.05 times the minimum thickness S is set to 2/5 or more of the perimeter of the entire fiber to obtain good stretchability without crimp unevenness. Furthermore, since the spiral structure of each fiber becomes uniform when crimping occurs, there is no fineness unevenness and sufficient stretchability can be obtained. A woven or knitted fabric with good texture can be obtained.

Furthermore, it is preferable that the curvature radius IFR of the interface between the A component and the B component in the cross section of the fiber satisfies the following formula 1 when the value R obtained by dividing the fiber diameter D by 2 is used. The radius of curvature IFR referred to here is a circle (dashed line ).
(IFR/R)≧1 (Formula 1)

This means that the interface is more straight. In the present invention, by forming the interface between the A component and the B component into a curve close to a straight line in a form similar to the cross section of a conventional laminated crimped yarn, high crimping that could not be achieved with conventional eccentric core-sheath composite fibers can be achieved. It is preferable because it can be expressed. More preferably, it is 1.2 or more.

The minimum thickness S at which the thickness of the B component covering the A component is the minimum, the fiber diameter D, the curvature radius IFR of the interface, and the area ratio are not particularly limited, but are obtained, for example, as follows. be able to.

That is, a multifilament made of an eccentric core-sheath composite fiber is embedded in an embedding agent such as an epoxy resin, and a cross section perpendicular to the fiber direction is examined with a transmission electron microscope (TEM) at 10 or more (points). The image is taken at a magnification at which the fibers of the fiber can be observed. At this time, if metal dyeing is applied, the difference in dyeing between polymers can be used to clarify the contrast at the junction between the A component and the B component. Set a circle circumscribing the cross section of 10 (places) eccentric core-sheath composite fiber monofilaments randomly extracted from each photographed image within the same image, and measure the circumscribed circle diameter. The value obtained corresponds to the fiber diameter D referred to in the present invention. The circle circumscribing the cross section here is a perfect circle that circumscribes the cross section perpendicular to the fiber axis from the image taken two-dimensionally, and circumscribes this cutting plane at two or more points. The circle diameter means the diameter of the perfect circle. In addition, using the image obtained by measuring the fiber diameter D, the value obtained by measuring the minimum thickness of the B component covering the A component for 10 (places) or more fibers is the minimum thickness S referred to in the present invention. Equivalent to. Further, the fiber diameter D, the minimum thickness S, and the radius of curvature IFR are measured in units of μm and rounded off to the third decimal place. A simple numerical average value of the measured values and their ratio (S/D) is calculated for ten images photographed during the above operation. The area ratio is obtained by using the image taken as described above and the image analysis software "WinROOF2015" manufactured by Mitani Shoji Co., Ltd., after obtaining the area of the entire fiber and the areas of the A component and the B component, and then obtaining the area ratio.

In the cross-section of the eccentric core-sheath composite fiber of the present invention, deformation of the cross-section due to false twisting occurs in the eccentric core-sheath composite fiber as well as conventional fibers. When the eccentric core-sheath composite fiber is false-twisted, the false-twisting process causes large variations. The thickness characteristics around S change slightly. Even with such a change, the same effect can be obtained.

That is, when the eccentric core-sheath composite fiber is false twisted, the A component is completely covered with the B component as a false twist yarn, and the minimum thickness S and the fiber diameter D of the B component covering the A component are When the ratio S/D is 0.01 to 0.2, preferably 0.01 to 0.10, a stable stretch with little unevenness can be obtained especially in the longitudinal direction of the fiber.

In addition, the peripheral length of the fiber in the portion whose thickness is 1.1 times or less than the minimum thickness S must be 1/3 or more of the peripheral length of the entire fiber, and more preferably 1.05 times or less than the minimum thickness S. By setting the perimeter of the thickness to 2/5 or more of the perimeter of the entire fiber, there is no crimp unevenness and good stretchability can be obtained. In addition, the cross section can be measured by the same measuring method as described above.

In the present invention, it is preferable that the melt viscosity difference between the polymers to be combined is larger in consideration of crimp development and the like. A more preferable range is 100 Pa·s or more. When promoting this point of view, it is preferable to increase the melt viscosity difference, but considering the characteristic expression and the controllable elongation deformation difference in the spinning line, in the present invention, the melt viscosity difference of the polymer to be combined is 100 to 400 Pa s. is a particularly preferable range. Here, by increasing the expression of crimps, the stretchability of the woven or knitted fabric is improved. Due to this effect, it is possible to achieve an elongation rate of 15% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp direction and weft direction of a woven or knitted fabric using eccentric core-sheath composite fibers. Become.

In addition, as a combination of the core component (component A) and the sheath component (component B), the combination of polyesters has good crimp and mechanical properties, and is excellent in dimensional stability against humidity and temperature changes. preferable. In particular, the use of polybutylene terephthalate (PBT) as the A component is particularly preferred because it provides a woven or knitted fabric with good crimp and high stretchability. That is, since PBT has a high shrinkage rate as a polymer property, for example, when combined with PET, the shrinkage rate difference increases, so the crimp development force is large, and when it is made into a woven or knitted fabric, it exhibits high stretch performance. show. Furthermore, since PBT has very high crystallinity, it is excellent in dimensional stability in fiber form, and it is possible to suppress streak defects in woven and knitted fabrics caused by uneven tension and temperature. Polytrimethylene terephthalate (PPT) can also be preferably used as the A component because it gives a woven or knitted fabric with high crimp and high stretchability.

The eccentric core-sheath composite fiber used in the present invention preferably has a stretch ratio of 20 to 70% according to JISL1013 (2010) Section 8.11 Method C (simple method). More preferably 40% to 65%. This is a value indicating the degree of crimping, and the higher the value, the better the stretching performance. In addition, it is preferable that the elongation ratio of the false twisted yarn is also within the above range.

The eccentric core-sheath composite fiber used in the present invention preferably has a Worcester spot U%, which is an index of thickness unevenness in the longitudinal direction of the fiber, so-called fineness unevenness, of 1.5% or less. As a result, it is possible not only to avoid uneven dyeing of the woven or knitted fabric, but also to avoid deterioration of the quality due to uneven contraction of the woven or knitted fabric, thereby obtaining a good quality of the woven or knitted fabric. More preferably, it is 1.0% or less. The Worcester spots in the false twisted yarn are also preferably within the above range.

The single filament fineness of the eccentric core-sheath composite fiber used in the present invention is preferably 1.0 dtex or less. More preferably, it is 0.8 dtex or less. As a result, the amount of yarn per unit area can be reduced, so that the weight of the woven or knitted product can be improved, the rigidity of the fiber can be reduced, and softness can be further imparted. The single yarn fineness of the false twisted yarn is also preferably within the above range.
In addition, due to the fine spiral structure due to the crimping performance of the eccentric core-sheath composite fiber used in the present invention, the woven and knitted fabric has a dense surface morphology. It becomes the material.

In order to overcome the binding force of the woven or knitted fabric and stably develop crimps, the shrinkage stress and the temperature at which the shrinkage stress reaches its maximum value are important characteristics. The higher the shrinkage stress, the better the crimp expression under restraint of the woven or knitted fabric, and the higher the temperature at which the maximum shrinkage stress is exhibited, the easier the handling in the finishing process. Therefore, in order to further enhance crimp expression, the temperature at which the maximum shrinkage stress is exhibited is preferably 110°C or higher, more preferably 130°C or higher, and the maximum shrinkage stress is 0.15 cN/dtex or higher. It is preferably 0.20 cN/dtex, more preferably 0.20 cN/dtex.

The eccentric core-sheath composite fiber of the present invention preferably has a certain level of toughness in consideration of processability and practical use in advanced processing, and the strength and elongation of the fiber can be used as indices. can. Here, the strength is a value obtained by dividing the load value at break by the initial fineness obtained by obtaining the load-elongation curve of the fiber under the conditions shown in JIS L1013 (2010), and the elongation is the value at break. It is the extension divided by the initial test length. In addition, the initial fineness means a value obtained by calculating the weight per 10000 m from a simple average value obtained by measuring the weight of the unit length of the fiber multiple times.

The eccentric core-sheath composite fiber used in the present invention preferably has a strength of 0.5 to 10.0 cN/dtex and an elongation of 5 to 700%.

In the eccentric core-sheath composite fiber used in the present invention, the upper limit of strength is 10.0 cN/dtex, and the upper limit of elongation is 700%. When the eccentric core-sheath composite fiber of the present invention is used for general clothing such as innerwear and outerwear, it is preferable that the strength be 1.0 to 4.0 cN/dtex and the elongation be 20 to 40%. In addition, in applications such as sports clothing in which the use environment is severe, it is preferable to set the strength to 3.0 to 5.0 cN/dtex and the elongation to 10 to 40%.

As described above, in the eccentric core-sheath composite fiber used in the present invention, it is preferable to adjust the strength and elongation by controlling the conditions of the manufacturing process according to the intended use.

The eccentric sheath-core composite fiber used in the present invention is preferably false-twisted. This is because the false twisting can suppress uniformity of crimps between the single yarns, thereby improving the quality of the woven or knitted fabric, such as grains and wrinkles. As the false twisting method, any method such as a commonly used pin type, friction disk type, nip belt type, or air twisting type may be used. Further, one-stage heater false-twisting or two-stage heater false-twisting can be appropriately selected. For example, when one-stage heater false twisting is performed, the stretchability of the woven or knitted fabric is emphasized, and two-stage heater false twisting is used to suppress dimensional changes and abnormal shrinkage during the processing process. can.

Two or more of the eccentric core-in-sheath composite fiber used in the present invention and another fiber (the same eccentric core-in-sheath composite fiber may be used) may be combined or mixed for use. The mixed yarn is preferably in a state in which two or more types of single yarns having different cross-sectional shapes are dispersed and mixed in the yarn bundle. The state of being dispersed and mixed here means that when observing the cross section of the yarn bundle, multiple types of fibers may be uniformly dispersed without bias, or may be arranged like a core-sheath structure. Alternatively, a mixed state in which most of them are parallel and only some of them are mixed is also possible. Since the eccentric core-sheath composite fiber is characterized by its stretchability, even if it is arranged in a conventionally used mixed yarn, the stretchability is greatly improved compared to the conventionally used mixed yarn. In addition, when eccentric core-sheath composite fibers having a small single filament fineness are used, the softness is greatly improved.

In the mixed yarn of the eccentric core-sheath composite fiber and other fibers used in the present invention, the ratio of the eccentric core-sheath composite fiber is preferably in the range of 20 to 80%. When there is a difference in the dyeability of the constituent single yarns, when a woven or knitted fabric is formed, single yarns of multiple compositions appear appropriately without appearing on the surface of the woven or knitted fabric, resulting in a natural heather. In order to obtain a textured woven or knitted fabric, it is more preferable that the weight ratio of the eccentric core-sheath composite fiber in the mixed yarn is in the range of 20 to 80%. In addition, in a mixed yarn having different dyeability among constituent single yarns, the degree of dispersion of the single yarns can be changed within the above range by arranging the arrangement of the single yarns constituting the mixed yarn. Therefore, it is also possible to control the pitch and color tone of the heather. Here, the difference in the dyeability of the single yarn means that when the mixed yarn is dyed with the same dye under the same conditions, the color development differs depending on the type of fibers that make up the mixed yarn. Examples of combinations of fibers with different dyeability include polyester eccentric core-sheath composite fibers such as polyethylene terephthalate and polybutylene terephthalate that can be dyed with disperse dyes, cationic dyeable fibers, nylon fibers, and cellulose fibers. A combination with fibers that can be dyed with other than disperse dyes, such as fibers, is preferred. In addition, fibers dyed with disperse dyes may be combined with fibers having different color development properties after dyeing with disperse dyes due to full dull, bright, single filament fineness, or the like.

In the above mixed yarn, interlace mixed yarn, Taslan mixed yarn, propriety of false twisting, two or more kinds of mixed yarn, etc. can be appropriately selected and used depending on the purpose. In addition to the mixed fiber of long fibers obtained by the manufacturing method of the eccentric core composite fiber described later, the eccentric sheath composite fiber is fiber-cut to make a mixed fiber of short fibers to make a spun yarn. The sheath conjugate fiber can be left as it is as a long fiber, and it can be used according to the purpose, such as making a long and short conjugate spun yarn by MVS, ring, plied twist, etc. with other short fibers.

Here, if it is desired to use the elongation rate and the elongation recovery rate of the woven or knitted fabric favorably, it is most preferable to process a mixture of long fibers, followed by a combined process of long and short fibers (especially, a composite fiber in which the eccentric core-sheath composite fiber is left as a long fiber, Long and short combined processing to form a long and short combined spun yarn is preferred). On the other hand, if emphasis is placed on soft texture, natural fiber-like texture, and appearance, the composite processing of short fibers is most preferable, followed by the composite processing of long and short fibers.

In the mixed yarn, when a single yarn composed of a single component is used as another fiber, it is also possible to select from the melt-moldable polymers described above depending on the intended use. For example, when the eccentric core-sheath composite fiber and the polymer having different dyeability are used, when a woven or knitted fabric is formed, a heather tone corresponding to the color tone difference can be obtained. In addition, when using a polymer that has a high shrinkage rate during heat treatment, such as copolyester, the yarn length difference between the single yarns is large after heat treatment, and the single yarn with a low shrinkage ratio rises to the surface. Therefore, a woven or knitted fabric having excellent texture can be obtained.

In this way, when one or more types of individual yarns are included in the mixed yarn, the polymer to be used and the shape can be freely selected, and various functions can be imparted to the mixed yarn, which is preferable.

Next, a preferred method for producing the eccentric core-sheath composite fiber used in the present invention will be described. The eccentric core-sheath composite fiber used in the present invention can be obtained by a two-step method in which the discharged polymer is once wound as an undrawn yarn and then drawn, a direct spinning drawing method in which the spinning and drawing steps are continuously performed, and a high-speed spinning method. etc., can be manufactured in any process. Further, since the range of spinning speed in the high-speed spinning method is not particularly specified, a step of winding the yarn as a semi-drawn yarn and then drawing it may be used. Further, yarn processing such as false twisting can be performed as necessary.

When the eccentric core-sheath composite fiber of the present invention is produced by a two-step method, any ordinary drawing method can be used in addition to hot roll-hot roll drawing and hot pin drawing. Further, the film may be stretched while being entangled or false twisted depending on the application. In order to suppress complex abnormalities such as fluffing and separation of both components, the drawn yarn is preferably drawn so that the residual elongation is 25 to 50%. Heat setting is performed in a stretched state, and the molecular chains are structurally fixed by cooling to a temperature below the glass transition temperature while maintaining tension. Specifically, it is preferable to pass the film through cold rolls in a stretched state of about 0.3 to 3.0% because a high shrinkage stress can be obtained. In addition, since the spinning and winding are performed in a state where stress strain is applied to the shrinking polymer side (for example, the A component of the present invention) in order to develop crimps, viscoelasticity is applied before forming the woven or knitted fabric after winding. Depending on the behavior, delayed shrinkage may occur, and streaks may occur in the woven or knitted fabric.

On the other hand, in the eccentric core-sheath composite fiber used in the present invention, one side component is completely covered with the other side component, so delayed shrinkage can be suppressed, and it can also contribute to obtaining a uniform woven or knitted fabric. Furthermore, it is possible to use high-molecular-weight polymers, high-elasticity polymers, etc., which could not be used so far as high-shrinkage components, and to obtain new eccentric core-sheath composite fibers that could not be obtained conventionally.

The spinning temperature is preferably set at +20 to +50°C higher than the melting point of the polymer. By setting the temperature higher than the melting point of the polymer by +20 ° C. or more, it is possible to prevent the polymer from solidifying and clogging in the spinning machine pipe, and by setting the temperature to be higher than +50 ° C., excessive polymer It is preferable because heat deterioration can be suppressed.

The eccentric core-sheath composite fiber used in the present invention is preferably obtained by a melt spinning method, and the spinneret may have any commonly used internal structure as long as it can be spun with stable quality and operation. In particular, a desired cross-sectional shape can be obtained by suitably using a distribution plate type die as exemplified in JP-A-2011-174215, JP-A-2011-208313, and JP-A-2012-136804.

Here, it is important that the eccentric core-sheath composite fiber used in the present invention completely covers the A component with the B component as shown in FIG. By making the cross section specified in the present invention, it is possible to suppress the bending of the ejection line (kneeing phenomenon) caused by the difference in flow velocity between the two types of polymers during ejection from the die. In addition, in the case of the conventional simple bonding structure (bimetal structure), there is a difference in the stress balance applied to each polymer when thinning on the spinning wire after ejection from the spinneret, and unevenness occurs in extensional deformation, which is the fineness unevenness. , and U % became large. This tendency appears very remarkably when combining polymers with a large difference in viscosity, or when reducing the fineness by reducing the discharge rate, etc., but in the present invention, the polymer is covered with one polymer. As a result, the stress balance is balanced within the cross section of the fiber, and fineness unevenness can be suppressed. Furthermore, when a high-molecular-weight polymer is used as the A component and a low-molecular-weight polymer is used as the B component, it has been found that the high-speed spinning stability is excellent because the B component is completely covered. This is because the low-molecular-weight polymer is placed on the outside, making it easier for the high-molecular-weight polymer to follow the elongation deformation after ejection from the nozzle. As a result, even in fine fineness yarn, the degree of freedom in polymer selection for improving added value other than improving stretch performance and improving spinning stability increases dramatically, contributing to improved productivity. As described above, uneven fineness can be suppressed by adopting the cross-sectional shape specified in the present invention.

The woven or knitted fabric of the present invention is a woven or knitted fabric that is knitted or woven using the eccentric core-sheath composite fiber at least in part, and is subjected to a load of 1.5 kgf (14.7 N) in at least one of the warp and weft directions. It is preferable that the elongation rate at time is 15% or more. This is a performance exhibited by the high stretchability of the eccentric core-sheath composite fiber used in the present invention. A woven or knitted fabric that is less likely to hinder movement can be obtained. More preferably, the elongation rate is 25% or more. When it is desired to increase the elongation rate, a knitted fabric or the like may be appropriately selected as desired. If the elongation rate is too high, the recovery rate decreases, so the upper limit of the elongation rate is preferably 100% or less.

Further, the woven or knitted fabric of the present invention preferably has an elongation recovery rate of 75% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp and weft directions. By setting the elongation recovery rate to 75% or more, the wari phenomenon in the woven or knitted fabric is reduced, and the woven or knitted fabric is less prone to knee and elbow slippage.

The abrasion resistance of the woven or knitted fabric using the eccentric core-sheath composite fiber of the present invention is preferably 2000 times or more until grade 3 discoloration according to JIS L 1096 E method. There is no upper limit to the abrasion resistance, and the higher the better, but the realistic upper limit is about 10,000 times in terms of industrial production. In woven and knitted fabrics obtained from fibers with a bimetallic structure that are simply bonded, peeling occurs at the interface due to friction and impact, and there is a tendency for the quality of the woven and knitted fabrics to decrease due to whitening and fluffing in some areas. . In the eccentric core-sheath composite fiber used in the present invention, since one component polymer is covered with another component polymer, whitening and fluffing due to interfacial peeling that occur in conventional bimetallic fibers are suppressed. and a woven or knitted fabric with high abrasion strength is obtained.

The eccentric core-sheath composite fiber used in the present invention preferably has a single filament fineness of 1 dtex or less as described above, and in its production, the easily elutable component is the sea and the eccentric core-sheath composite fiber is the island. Although it is possible to obtain a sea-island composite fiber by manufacturing it as a sea-island composite fiber and then eluting and removing the sea component, it is also possible to manufacture it by direct spinning for the reasons described later. That is, it is preferable that the eccentric core-sheath composite fiber used in the present invention does not contain a sea-island elution component. By covering the bimetal structure composite fiber with the sea-island eluted component, it is possible to obtain a fiber with a fine single filament fineness while improving spinnability, but the cost of woven and knitted fabrics is increased due to the need for an elution process in the dyeing process. Go up. In addition, woven or knitted fabrics made of bimetallic composite fibers obtained by sea-island elution are set before the occurrence of crimp development by applying heat before elution, and the crimp development effect is reduced. It is not preferable because the stretchability of is lowered. However, it is possible to use a fiber containing a sea-island elution component as the other side of the eccentric core-sheath composite fiber of the present invention as a mixed yarn, since this does not fall under the above-mentioned decrease in stretchability.

When the eccentric core-sheath composite fiber used in the present invention has a fine single yarn fineness, if the total fineness is the same, the fiber bundle can have a large number of single yarns and has a highly crimped structure. Compared to false-twisted yarns and high-count yarns having a large number of single yarns, the number of fibers and the effects of crimping can more effectively fill voids present in the woven or knitted fabric. By reducing the voids present in the woven or knitted fabric in this way, the wind resistance and water pressure resistance can be improved. This improvement effect is particularly remarkable when compared with woven or knitted fabrics produced in the same manner using ordinary fibers having the same total fineness and filament number.

The total fineness of the eccentric core-sheath composite fiber used in the present invention can be set within a range of 10 dtex or more and 600 dtex or less. Furthermore, the preferred range for clothing is 10 dtex or more and 300 dtex or less.

Here, by increasing the density of the woven or knitted fabric and calendering, a woven or knitted fabric with even higher wind resistance and water pressure resistance can be obtained, but at the same time the stretchability is reduced, so the density and processing method are appropriately selected according to the purpose. can do.

The good windproof property obtained by using the eccentric core-sheath composite fiber of the present invention is such that the woven fabric has an air permeability of 1 cc/cm ² /sec. below, and in knitted fabrics, the ventilation rate is 30 cc/cm ² /sec. It is below.

In addition, as described above, by using eccentric core-sheath composite fibers with a small single yarn fineness and a large number of single yarns, voids in the woven or knitted fabric can be reduced. A woven or knitted fabric with hydraulic pressure is obtained. As for the water pressure resistance performance, it is possible to achieve a water pressure resistance of 1000 mmH ₂ O (9.8 kPa) or more without coating or lamination. In knitted fabrics, even 500 mmH ₂ O (4.9 kPa) or more can be preferably used. The above water pressure resistance is evaluated with a woven or knitted fabric that is not coated, laminated, or the like. A more preferable range is a water pressure resistance of 2000 mmH ₂ O (19.6 kPa) or more for woven fabrics and a water pressure resistance of 1000 mmH ₂ O (4.9 kPa) or more for knitted fabrics without coating or lamination, which is more preferable as a highly effective material. Available.

The woven or knitted fabric of the present invention itself can be obtained as a woven or knitted fabric having excellent air permeability and water pressure resistance as described above, but the air permeability and water pressure resistance can be further improved by coating or laminating. is of course possible. It is appropriately selected according to the application and required properties.

In a woven or knitted fabric using an eccentric core-sheath composite fiber with a small single yarn fineness, the single yarn fineness is fine, so the number of single yarns constituting a fiber bundle increases compared to the case where the total fineness is the same. When water absorption processing is performed on the surface, the ability to absorb water is improved due to capillary action. As a result, water droplets can be quickly absorbed and diffused within the woven or knitted fabric structure, and a quick-drying material can be obtained. Comfortable sports clothing can be obtained by quickly absorbing and drying sweat during exercise. Here, a preferable water absorption time is 5 sec. It is below.

In addition, by making a woven or knitted fabric with a multi-layered structure and arranging the eccentric core-sheath composite fiber of the present invention on one side, the water absorption and quick drying performance can be improved, but depending on the fibers used, the stretchability and soft texture may be impaired. Therefore, it is necessary to appropriately select the yarns, the woven or knitted fabric structure, and the processing method.

Further, the eccentric core-sheath composite fiber may be given a real twist depending on the use of the woven or knitted fabric. As a twisting method, a conventional method may be used, and twisting conditions may be appropriately selected. For example, if the eccentric core-sheath composite fiber used in the present invention is strongly twisted, a woven or knitted fabric that is soft, stretchy, refreshing, and has a stiff feeling can be produced. Uniformity of surface texture can be imparted.

In the woven or knitted fabric of the present invention, any structure such as jersey, smooth, half, double raschel, plain weave, and twill weave can achieve the stretch performance and texture, but the multi-layer structure of two or more layers is used. A woven or knitted fabric having Knitted fabrics include circular knitted fabrics such as reversible jersey, punch roma, milanese rib and tuck rib, single warp knitted fabrics such as inlay fabrics, and double warp knitted fabrics such as double raschel fabrics. Examples of woven fabrics include multi-layered woven fabrics that can have a multi-layered structure, such as warp double woven fabrics and weft double woven fabrics. Among them, a knitted fabric is preferable in terms of quick drying.

The woven or knitted fabric of the present invention thus obtained has a high stretchability, a soft and delicate texture, and a uniform appearance without grains or streaks. can be used.

The eccentric core-sheath composite fiber of the present invention will be specifically described below with reference to examples. Examples and comparative examples were evaluated as follows.

(1) Melt Viscosity of Polymer A chip-shaped polymer was made to have a moisture content of 200 ppm or less by a vacuum dryer, and the melt viscosity was measured by changing the strain rate stepwise by Capilograph 1B manufactured by Toyo Seiki Co., Ltd. The measurement temperature is the same as the spinning temperature, and a melt viscosity of 1216 s ⁻¹ is described in Examples and Comparative Examples. Incidentally, the measurement was performed in a nitrogen atmosphere with 5 minutes from the time when the sample was put into the heating furnace until the time when the measurement was started.

(2) Fineness 100 skeins were produced using a measuring machine with a frame circumference of 1.0 m, and the fineness was measured according to the following formula.
Fineness (dtex) = Skein weight (g) for 100 times x 100

(3) Fiber strength, breaking elongation, toughness The sample is subjected to constant speed elongation shown in JIS L1013 (2010) 8.5.1 standard time test with a tensile tester ("TENSILON" UCT-100 manufactured by Orientec) Measured under conditions. At this time, the gripping distance was 20 cm, the pulling speed was 20 cm/min, and the number of tests was 10. The elongation at break was obtained from the elongation at the point showing the maximum strength on the SS curve. The toughness was obtained from the following formula.
Toughness = strength (cN/dtex) x (elongation (%)) ^1/2

(4) U% of eccentric core-sheath composite fiber
U% (H) was measured using a fineness unevenness measuring device manufactured by Zellweger (UT-4) under the conditions of a yarn supply speed of 200 m/min, a twister rotation speed of 20000 rpm, and a measurement length of 200 m.

(5) Stretching elongation rate (fiber)
According to JIS L1013 (2010) Section 8.11 C method (convenient method), the stretching elongation rate was determined. Heat treatment before measurement was performed at 90° C. for 20 minutes.

(6) Elongation rate (woven or knitted fabric)
The elongation rate under a load of 1.5 kgf (14.7 N) was measured according to the A method (strip method) described in JISL1096 (2010).

(7) Elongation recovery rate (woven or knitted fabric)
According to the A method described in JISL1096 (2010), a 1.5 kgf (14.7 N) load was measured for the elongation recovery rate when unloaded.

(8) Abrasion strength According to the JISL1096E method (Martindale method), the number of times of abrasion was measured at the point where the discoloration was grade 3.

(9) Air permeability A Frazier type air permeability test described in JISL1096 (2010) was carried out.

(10) Water pressure resistance Water pressure resistance was measured according to JISL1092 (2010) A method (low water pressure method).

(11) Water absorption time The water absorption time was measured according to JISL1097 (2010) dropping method.

(12) Drying rate (diffusible residual moisture content)
Drying rate was measured according to ISO 17617 A1 method.

(13) Texture Sensory evaluation was performed on a scale of ⊚, ∘, Δ, x, and xx.
⊚: Fairly soft texture.
◯: Soft texture.
△: Usable texture.
x: Slightly hard texture xx: Too hard texture to the extent that it cannot be used.

(14) Water repellency (degree of water repellency)
It was evaluated according to JIS L 1092 spray method.

[Example 1]
(Reeling method and evaluation of eccentric core-sheath composite fiber)
Polybutylene terephthalate (PBT melt viscosity: 160 Pa s) is used as the A component, polyethylene terephthalate (PET melt viscosity: 140 Pa s) is used as the B component, and both the A component polymer and the B component polymer are extruded. After melting at 270 ° C. and 280 ° C. respectively, weighing with a pump, setting the spinning temperature to 290 ° C., which is 30 ° C. higher than the melting point of component B, which is the highest melting point of each polymer, and flows into the spinneret while maintaining the temperature. let me The weight composite ratio of the A component and the B component was set at 50/50, and the components were flowed into a spinneret for eccentric core-sheath composite fibers having 72 discharge holes. The respective polymers joined together inside the die to form an eccentric core-sheath composite form in which the polymer of component A was included in the polymer of component B, and the polymer was discharged from the die. In addition, in the spinning of Example 1, a spinneret of a distribution plate type was used so as to obtain the eccentric core-sheath composite fiber shown in FIG.

The yarn extruded from the spinneret is cooled by an air cooling device, oiled, and then wound by a winder at a speed of 1500 m/min so that the spinning draft is 220, and is stably wound as an undrawn yarn of 150 dtex-72 filament. I took At this time, the cooling start point is set at 97 mm from the ejection surface of the spinneret, and the lubricating position is set at 1130 mm from the ejection surface of the spinneret, resulting in a spinning stress of 0.10 cN/dtex, which suppresses longitudinal yarn unevenness and stabilizes spinning performance. planned. Subsequently, the obtained undrawn yarn is sent to a drawing device at a speed of 300 m/min, and drawn at a drawing ratio of 2.63 times so that the drawing temperature is 90 ° C. and the elongation is about 20 to 40%. A drawn yarn of 56 dtex-72 filaments having a strength of 3.6 cN/dtex and an elongation of 32% was stably obtained through the process of heat setting at 130° C., spinning and drawing. The S/D in the fiber cross section was 0.02, the minimum thickness portion occupied 40% of the fiber circumference, and the IFR/R was 1.3. The elastic elongation rate was 63%, and the U%, which is an index of uneven fineness, was 1.3%.

(Manufacturing method and evaluation of woven or knitted fabric)
The obtained drawn yarn is subjected to false twisting under normal conditions, woven with a plain weave using the warp and weft, and then subjected to normal dyeing and water absorption processing to fabric (hereinafter referred to as textile greige (sometimes referred to as ) was created. The obtained woven fabric was an unprecedented woven fabric having both high stretchability and soft touch like knitted fabric, and was a flat woven fabric having abrasion resistance in the abrasion test. In addition, the water absorption time was 1 second or less, and the quick drying property was 25 minutes based on the diffusible residual moisture content.

The S/D in the fiber cross section of the false twisted yarn is 0.08, and the peripheral length of the fiber in the portion where the thickness is within 1.1 times the minimum thickness S accounts for 38% of the total peripheral length of the fiber. The single filament fineness was 0.8 dtex, the expansion and contraction rate was 66%, and the U%, which is an index of uneven fineness, was 1.3%.

[Example 2]
After knitting a circular knitted fabric with a jersey structure using 100% false twisted yarn obtained in Example 1, a knitted fabric was produced by a normal dyeing process and water absorption process. The obtained circular knitted fabric was a novel circular knitted fabric having both high stretchability and soft touch, and was a circular knitted fabric having abrasion resistance in the abrasion test. In addition, the water absorption time was 1 second or less, and the quick drying property was 30 minutes based on the diffusible residual moisture content.

[Example 3]
After knitting a circular knitted fabric with a jersey structure using 100% of the drawn yarn obtained in Example 1, a knitted fabric was produced by a normal dyeing processing method and water absorption processing. The knitted fabric thus obtained was a circular knitted fabric having both high stretchability and soft touch, particularly slippery feel, and abrasion resistance in the abrasion test. In addition, the water absorption time was 1 second or less, and the quick drying property was 30 minutes based on the diffusible residual moisture content.

[Example 4]
The greige fabric obtained in Example 1 was subjected to a normal dyeing method and a non-fluorine water-repellent finish. The resulting woven fabric had both high stretchability and a soft feel, and was a woven fabric that had never been seen before. The water repellency was high, and the water repellency was grade 4.5 at the initial stage and grade 3.5 after 10 washings. Also, the air permeability is 1 cc/cm ² /sec. , and the water pressure resistance was 1200 mmH ₂ O (11.8 kPa), which was a good performance.

[Example 5]
Knitting was carried out in the same manner as in Example 2 except that the knitting density was increased, and ordinary dyeing and non-fluorine water-repellent finishing were carried out. The obtained knitted fabric had both high stretchability and soft texture, and had unprecedentedly high water pressure resistance. The water repellency was 4.5 at the initial stage and 3.5 after 10 washings. In addition, air permeability is also 9 cc/cm ² /sec. , and the water pressure resistance was 800 mmH ₂ O (7.9 kPa), which was a good performance.

[Example 6]
The greige fabric obtained in Example 1 was subjected to ordinary dyeing processing, non-fluorine water-repellent processing, and coating processing with urethane resin. Normally, the texture of the fabric is hardened by the coating process, but the obtained fabric is a coated product that has both high stretchability and soft texture, and is an unprecedented fabric, and in the abrasion test of the coated product was a fabric with abrasion resistance. The water repellency was grade 4.5 at the initial stage and grade 3.5 after 10 washings. Also, the air permeability is 0.0 cc/cm ² /sec. , and the water pressure resistance was 4000 mmH ₂ O (39.2 kPa), which was a good performance.

[Comparative Example 1]
In Comparative Example 1, a spinneret similar to the spinneret described in the example of JP-A-09-157941 was used, and polybutylene terephthalate was used as the component A and polyethylene terephthalate was used as the component B. A side-by-side type, drawn yarn of 56 dtex--36 filaments was obtained by a conventional spinning and drawing method. The S/D in the cross section of the fiber and the ratio of the minimum thickness portion to the circumference of the fiber are not shown because the cross section is side-by-side. The stretching and elongation rate was 70%.

The resulting drawn yarn was false twisted, woven and processed in the same manner as in Example 1 to obtain a water-absorbent plain weave fabric. The obtained woven fabric had a high stretchability, but had a hard texture and was slightly inferior in abrasion resistance. Moreover, the water absorption time was 1 second or less, and the quick-drying property was 30 minutes at the diffusible residual moisture content.

[Comparative Example 2]
Comparative Example 2 uses a 56 dtex-72 filament false twisted yarn ("Tetoron W20L" manufactured by Toray Industries, Inc.) whose component is polyethylene terephthalate alone, is woven and processed in the same manner as in Example 1, and has a water-absorbing property. A woven fabric with a plain weave was obtained. The resulting woven fabric had good texture and abrasion resistance, but was inferior in woven fabric stretchability. Moreover, the water absorption time was 1 second or less, and the quick-drying property was 30 minutes at the diffusible residual moisture content.

a: Gravity center point of A component in conjugate fiber cross section C: Gravity center point of conjugate fiber cross section S: Minimum thickness of B component D: Fiber diameter IFR: Curvature radius of interface between A component and B component in conjugate fiber cross section 1-(a ), (b): An example of the same type of single yarns that are adjacently connected in the cross section of the mixed yarn 1-(c): An example of a group of adjacent filaments in the cross section of the mixed yarn 5-(a): Distribution holes in the final distribution plate Of these, distribution hole 5-(b) for component B forming the thin skin: distribution hole 5-(c) for component B other than 5-(a) among distribution holes in the final distribution plate: distribution hole in the final distribution plate Among them, the distribution hole for the A component

Claims (12)

In the cross section of the eccentric core-sheath composite fiber consisting of two polymers, the A component and the B component, the A component is completely covered with the B component, and the minimum thickness S of the B component covering the A component The ratio S/D of the fiber diameter D is 0.01 to 0.1, and the peripheral length of the fiber in the portion where the thickness is within 1.05 times the minimum thickness S is 1/3 or more of the peripheral length of the entire fiber. A woven or knitted fabric in which a certain eccentric core-sheath composite fiber is used at least in part, wherein the eccentric core-sheath composite fiber has a single yarn fineness of 1.0 dtex or less and a fineness unevenness (U%) of 1.5% or less. A certain woven fabric . In the cross section of the false-twisted eccentric core-sheath composite fiber consisting of two types of polymers, the A component and the B component, the A component is completely covered with the B component, and the B component covering the A component The ratio S/D of the minimum thickness S to the fiber diameter D of the thickness is 0.01 to 0.2, and the perimeter of the fiber in the portion where the thickness is within 1.10 times the minimum thickness S is the perimeter of the entire fiber. A woven or knitted fabric in which at least a part of the eccentric core-sheath composite fiber is 1/3 or more of the Woven or knitted fabrics with a content of 1.5% or less . The woven or knitted fabric according to claim 1 or 2, wherein the eccentric core-sheath composite fiber has an expansion ratio of 20 to 70%. The woven or knitted fabric according to any one of claims 1 to 3 , which has an elongation of 15% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp direction and the weft direction. The woven or knitted fabric according to any one of claims 1 to 4 , which has an elongation recovery rate of 75% or more under a load of 1.5 kgf (14.7 N) in at least one of the warp direction and the weft direction. The woven or knitted fabric according to any one of claims 1 to 5 , which has an abrasion resistance (JIS L 1096 E method grade 3 discoloration) of 2000 times or more. The woven or knitted fabric according to any one of claims 1 to 6 , wherein the eccentric core-sheath composite fiber does not contain a sea-island elution component. The woven or knitted fabric has an air permeation rate of 1 cc/cm ² /sec. The woven or knitted fabric according to any one of claims 1 to 7 , which is the following fabric. The woven or knitted fabric has an air permeability of 30 cc/cm ² /sec. The woven or knitted fabric according to any one of claims 1 to 7 , which is the following knitted fabric. The woven or knitted fabric according to any one of claims 1 to 8 , which has a water pressure resistance of 1000 mmH ₂ O (9.8 kPa) or more. The woven or knitted fabric according to any one of claims 1 to 10 , wherein the eccentric core-sheath composite fiber is contained in the woven or knitted fabric in an amount of 25% by weight or more. Water absorption time is 5 sec. The woven or knitted fabric according to any one of claims 1 to 7 and claim 11 , wherein:

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