Water-repellent woven fabric

Abstract

To provide a water-repellent woven fabric having not only water repellency but also excellent heat insulating property which can prevent a temperature inside a garment from dropping suddenly even when wetted with water.SOLUTION: A water-repellent woven fabric is a woven fabric comprising a combined filament entangled yarn composed of polyester fiber A having a single yarn fineness of 0.2 to 0.9 dtex and polyester fiber B having a single yarn fineness of 1.0 to 5.0 dtex, wherein a mass ratio (A / B) of the polyester fiber A to the polyester fiber B is in a range of 20 / 80 to 80 / 20, a protrusion is formed by polyester fiber A on a surface of the combined filament entangled yarn, a cover factor of the entire woven fabric is 2,200 to 4,000, a cover factor of the combined filament entangled yarn in the woven fabric is 1,100 to 2,600, and a water droplet rolling angle is 40 degrees or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a woven fabric having excellent water repellency and heat retention, and a method for producing the same. [Background technology]

[0002] Water-repellent woven fabrics have traditionally been desired in fields such as uniforms, sportswear, and outdoor clothing, and many water-repellent woven fabrics have been proposed to date. Recently, there has been a demand for even higher water repellency in weaving and knitting. For example, Patent Document 1 proposes a technique for improving water repellency by providing a fine uneven structure (protrusions) on the surface of a woven fabric, thereby creating a lotus effect that supports water droplets at points, and further forming an air-retaining layer. It is known that such a technique can impart high water repellency to a woven fabric using a conventionally known, inexpensive fluorine-based water repellent agent, without any special modifications to the fabric structure.

[0003] When sportswear, uniforms, and outdoor clothing are worn, they are likely to get wet in the rain outdoors or get splashed with water while working. This can lead to water droplets accumulating on the exterior of the clothing, or water droplets moving from the exterior to the interior of the clothing, i.e., toward the wearer's body surface, potentially causing a significant drop in the wearer's body temperature. Therefore, in addition to water repellency, woven fabrics for sportswear, uniforms, and outdoor use are required to have excellent heat retention properties that prevent a rapid drop in the temperature inside the garment even when wet. Patent Document 1 proposes a technology that uses a mixed fiber entangled yarn containing an infrared-absorbing substance to convert absorbed infrared rays into heat, thereby improving the heat retention of the fabric. However, the technology does not address heat retention when wet, and no water-repellent woven fabrics have yet been proposed that have excellent heat retention properties even when wet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-098661 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present invention is to obtain a water-repellent fabric that not only has water repellency but also has excellent heat retention properties, preventing a sudden drop in temperature inside the garment even when it gets wet. [Means for solving the problem]

[0006] As a result of intensive research, the inventors have discovered that in a woven fabric made of mixed interlaced yarns having protrusions formed on the surface, by setting the cover factor of the entire woven fabric and the mixed interlaced yarns in the woven fabric within a specific range, it is possible to achieve water repellency as well as high thermal insulation by preventing a sudden drop in temperature inside the garment even when it gets wet.

[0007] That is, the present invention is summarized as follows (1) to (4). (1) A water-repellent fabric comprising a mixed entangled yarn composed of polyester fiber A having a single yarn fineness of 0.2 to 0.9 dtex and polyester fiber B having a single yarn fineness of 1.0 to 5.0 dtex, wherein the mass ratio (A / B) of polyester fiber A to polyester fiber B is in the range of 20 / 80 to 80 / 20, protrusions of polyester fiber A are formed on the surface of the mixed entangled yarn, the cover factor of the entire fabric is 2200 to 4000, and the cover factor of the mixed entangled yarn in the fabric is 1100 to 2600, and the water drop rolling angle is 40 degrees or less. (2) A water-repellent fabric according to (1), in which both the warp and weft threads of the fabric contain mixed fiber interlaced yarns. (3) Basis weight: 80 to 300 g / m 2 The water-repellent fabric according to (1) or (2), (4) The water-repellent fabric according to any one of (1) to (3), which has a heat retention rate of 48% or more. [Effects of the Invention]

[0008] According to the present invention, by using mixed fiber interlaced yarns having protrusions formed on the surface portion to produce a high-density fabric having a cover factor within a specific range, it is possible to provide a water-repellent fabric that has excellent water repellency and, even when wet, prevents water from quickly flowing off the fabric, thereby preventing a sudden drop in the temperature inside the wearer's clothing, and has high heat retention. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram illustrating an example of a method for producing a mixed interlaced yarn constituting the water-repellent fabric of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below.

[0011] The water-repellent fabric of the present invention contains a specific mixed and entangled yarn, and protrusions of polyester fiber A are formed on the surface of the mixed and entangled yarn.

[0012] [Mixed fiber interlaced yarn] The mixed entangled yarn is composed of polyester fiber A having a single yarn fineness of 0.2 to 0.9 dtex and polyester fiber B having a single yarn fineness of 1.0 to 5.0 dtex, with polyester fiber A being thinner than polyester fiber B. By setting the fineness of polyester fiber A and polyester fiber B within these specific ranges, polyester fiber A and polyester fiber B are sufficiently entangled, and this entanglement makes it easier to form protrusions of relatively thin polyester fiber A on the surface of the mixed entangled yarn. In the present invention, protrusions of polyester fiber A refer to portions of polyester fiber A protruding outward on the surface of the mixed entangled yarn due to loops or slack of polyester fiber A.

[0013] The surface structure of the mixed fiber entangled yarn will be explained. Fine protrusions are present on the surface of the mixed fiber entangled yarn, and when water droplets land on the mixed fiber entangled yarn, the water droplets are held on the protrusions and are therefore less likely to migrate inside the mixed fiber entangled yarn. Therefore, the so-called lotus effect occurs at the protrusions on the surface of the woven fabric, making it possible to exhibit excellent water repellency. Furthermore, by having relatively thin polyester fibers A protrude from the surface of the mixed fiber entangled yarn, the contact area with water droplets on the surface of the yarn is reduced, making it easier to exert surface tension on the water droplets, which tends to form relatively small, nearly spherical water droplets, and is thought to enable the water droplets to be quickly removed from the surface of the woven fabric. As will be described later, a mixed entangled yarn, which is made by blending two types of polyester fibers A and polyester fibers B having specific single yarn finenesses at a specific mass ratio, has a surface portion where relatively thin polyester fibers A are loosely entangled. This portion where the thin fibers are entangled forms a layer that easily retains air (air retention layer). The protruding portions protrude from this portion where the polyester fibers A are entangled. In other words, the above-mentioned air retention layer, formed by the thin polyester fibers A being loosely entangled, is formed inside the protruding portions of the polyester fibers A (on the side of the mixed entangled yarn), so moisture does not easily migrate inside the mixed entangled yarn. In the mixed entangled yarn, polyester fibers A and polyester fibers B are entangled further inside the air retention layer.

[0014] The single yarn fineness of polyester fiber A is 0.2 to 0.9 dtex, preferably 0.3 to 0.7 dtex. Polyester fiber B is 1.0 to 5.0 dtex, preferably 1.5 to 4.0 dtex. If the single yarn fineness of polyester fiber A is within the above range, polyester fiber A and polyester fiber B are well mixed and entangled, and the contact area between the woven fabric and water droplets is not too large, which facilitates the formation of the air-retaining layer as described above, resulting in excellent water-repellency. Furthermore, if the single yarn fineness of polyester fiber B is within the above range, polyester fiber A and polyester fiber B are well mixed and entangled, which allows the fine protrusions formed by polyester fiber A to be maintained on the surface of the mixed and entangled yarn, which facilitates the formation of an air-retaining layer, resulting in excellent water-repellency. Furthermore, the overall texture of the knitted fabric is not too stiff.

[0015] The difference in single yarn fineness between polyester fiber A and polyester fiber B is preferably 0.6 to 3.8 dtex, and more preferably 0.8 to 3.0 dtex. If the single yarn finenesses of polyester fiber A and polyester fiber B are approximately the same, when the mixed fiber entangled yarn is woven into a fabric, the fabric becomes too soft and tends to become a floppy fabric with no firmness. In addition, the entanglement of polyester fiber A and polyester fiber B becomes poor, which may prevent the formation of fine protrusions. On the other hand, if the difference in single yarn fineness exceeds 3.8 dtex, the difference in fineness between the single yarns becomes too large, making it difficult to maintain the shape of the protrusions and resulting in poor water repellency.

[0016] To impart stretchability to the water-repellent woven fabric of the present invention, a polyester conjugate yarn may be used for the polyester fiber B. The polyester conjugate yarn B may be one in which two types of polyester polymers with different heat shrinkage properties are bonded in a side-by-side or eccentric core-sheath configuration, and which has latent crimping properties. When the polyester fiber B has latent crimping properties, crimping occurs in the polyester fiber B when the water-repellent woven fabric of the present invention is heat-treated, and the woven fabric can have excellent stretchability and firmness.

[0017] The polyester conjugate yarn B preferably has a crimp rate of 50 to 85%, more preferably 55 to 80%, and even more preferably 60 to 75% after wet heat treatment in boiling water for 30 minutes. The crimp rate of polyester conjugate yarn B is measured by the same method as the method for measuring the crimp rate of mixed fiber entangled yarn, which will be described later.

[0018] As the polyester conjugate yarn B, any known polyester polymer having fiber-forming properties can be selected and used as long as it is a composite of two polymers with different heat shrinkage properties. Examples include homopolyethylene terephthalate (homoPET), polybutylene terephthalate, and polytetramethylene terephthalate, which are composed of ethylene terephthalate repeating units. The polyester polymer may also be recycled polyester.

[0019] When the two types of polyesters with different heat shrinkability are the same polyester, the heat shrinkability can be made different by making the intrinsic viscosities of the two polyesters different. That is, the polyester with a relatively low intrinsic viscosity can be used as the low heat shrinkable polyester, and the polyester with a relatively high intrinsic viscosity can be used as the high heat shrinkable polyester.

[0020] The mixed fiber entangled yarn preferably has an appropriate crimp. The crimp percentage is preferably 10 to 65%, more preferably 10 to 60%, and even more preferably 10 to 50%. When the mixed fiber entangled yarn has an appropriate crimp, it becomes easier to form the above-mentioned fine protrusions on the surface of the mixed fiber entangled yarn. In order to set the crimp percentage of the mixed fiber entangled yarn within the above range, for example, crimps can be imparted by subjecting polyester fiber A and / or polyester fiber B to false twisting in the mixed fiber entangled yarn production process. Note that when the crimp percentage of the mixed fiber entangled yarn is less than 10%, the crimp percentage is low, making it difficult to form the above-mentioned protrusions on the surface of the mixed fiber entangled yarn, and the woven fabric surface may tend to be unable to exhibit sufficient water repellency. Furthermore, if the crimp rate of the mixed fiber entangled yarn exceeds 65%, the stretch performance of the mixed fiber entangled yarn becomes too strong, and when the mixed fiber entangled yarn is stretched, it takes on a flat structure, making it difficult to maintain the above-mentioned protrusions, which may tend to result in a decrease in water repellency.

[0021] The crimp percentage of the mixed entangled yarn is a value measured by the following method. First, the mixed entangled yarn is spooled with 5 windings using a measuring machine with a frame circumference of 1.125 m, and the spool is then hung on a stand at room temperature in a free state for 24 hours. Next, the spool is immersed in boiling water with a load of 0.000147 cN / dtex applied, and subjected to a wet heat treatment for 30 minutes. The spool is then removed, lightly wiped dry with filter paper, and left at room temperature in a free state for 30 minutes. A load of 0.000147 cN / dtex and a load of 0.00177 cN / dtex (light load) are applied to the spool, and the length X is measured. Next, while the load of 0.000147 cN / dtex is still applied, a load of 0.044 cN / dtex (heavy load) is applied instead of the light load, and the length Y is measured. Thereafter, the crimp percentage is calculated based on the formula: crimp percentage (%) = (YX) / Y x 100. The crimp percentage is measured for five strands of the mixed fiber entangled yarn, and the average of the measurements is taken as the crimp percentage of the yarn.

[0022] The mass ratio (A / B) of polyester fiber A to polyester fiber B is in the range of 20 / 80 to 80 / 20. If the mass ratio (blending ratio) of polyester fiber A is less than 20%, the proportion of polyester fiber A in the mixed entangled yarn is too small, making it difficult to form the above-mentioned protrusions on the surface of the mixed entangled yarn, and it becomes difficult to impart high water repellency to the woven surface. On the other hand, if the blending ratio of polyester fiber A exceeds 80%, the proportion of polyester fiber B is too small, making it difficult to maintain the above-mentioned protrusions on the woven surface. As a result, the fine protrusions become easily crushed, making it difficult to impart high water repellency to the woven fabric. The mass ratio (A / B) of polyester fiber A to polyester fiber B is preferably about 30 / 70 to 70 / 30.

[0023] The mixed fiber entangled yarn is mixed and entangled throughout the yarn. The entanglement number of the mixed fiber entangled yarn is preferably about 90 to 200 / m. If the entanglement number is less than 90 / m, the entangled state tends to unravel, which may make it difficult to form the fine protrusions described above on the surface of the mixed fiber entangled yarn. Furthermore, if the entanglement state tends to unravel, guide wear, which is inevitable in the woven fabric manufacturing process, may cause misalignment within the yarn, which may lead to defects in the woven fabric. On the other hand, if the entanglement number exceeds 200 / m, the polyester fiber A and the polyester fiber B become too entangled, resulting in the loss of crimp and the formation of the protrusions described above, making it difficult to impart high water repellency to the woven fabric. The entanglement number of the mixed fiber entangled yarn is a value obtained by measurement based on the hook method in JIS L1013 8.15.

[0024] As described above, the mixed fiber entangled yarn used in the woven fabric is characterized in that (1) the single fiber fineness of the two yarns of polyester fiber A and polyester fiber B is set within the above-mentioned specific range, (2) the blending ratio of these two yarns is set within the above-mentioned specific range, and (3) the two yarns are mixed and entangled. With these configurations, fine protrusions are formed by polyester fiber A on the surface of the mixed fiber entangled yarn, and these protrusions retain water droplets on the protrusions and form air-retaining layers, making it difficult for moisture to migrate inside the mixed fiber entangled yarn and providing excellent water repellency. In addition, because the water droplets are relatively small and nearly spherical, they can be quickly removed from the surface of the woven fabric. Furthermore, as will be described later in this invention, by setting the cover factor of the entire fabric using mixed fiber entangled yarn and the cover factor of the mixed fiber entangled yarn in the fabric within specific ranges, the water repellency is enhanced, and water droplets on the surface of the fabric quickly flow off, making it less likely for water droplets to remain on the surface of the fabric.This prevents the temperature inside the garment from dropping suddenly even when it gets wet, and provides heat retention (anti-chill effect).

[0025] As long as the effects of the present invention are not impaired, at least one of polyester fiber A and polyester fiber B may contain an appropriate additive (e.g., a sunlight-blocking substance, an infrared-absorbing substance, or a dye). Furthermore, as long as the effects of the present invention are not impaired, cationic dyeable polyester may be used as the constituent material of polyester fiber A and / or polyester fiber B. When cationic dyeable polyester is used as at least one of the constituent materials of polyester fiber A and polyester fiber B, dyeing with a cationic dye during dyeing processing can impart a heathered appearance and develop a design. Furthermore, when cationic dyeable polyester is used as the constituent material of both polyester fiber A and polyester fiber B, the use of disperse dyes is unnecessary, thereby preventing migration sublimation.

[0026] In general, the thicker a fiber is, the more rigid it is, and the thinner it is, the more flexible it is, but by utilizing these fiber properties, in the composite false twisting process and mixed fiber entanglement process described below, relatively thin polyester fibers A are inserted into large gaps generated between relatively thick polyester fibers B, thereby causing polyester fibers A to protrude from the surface of the mixed fiber entangled yarn. That is, in such a mixed fiber entangled yarn, the polyester fibers A and polyester fibers B constituting the mixed fiber entangled yarn have single yarn finenesses within the above-mentioned specific ranges, and the blend ratio of these two types of fibers is set within the above-mentioned specific ranges, thereby forming the above-mentioned special surface structure and imparting excellent water repellency to the woven fabric.

[0027] The total fineness of the mixed interlaced yarn is not particularly limited, but is preferably 50 to 350 dtex, more preferably 50 to 300 dtex, for example.

[0028] [Method of manufacturing mixed fiber entangled yarn] The method for producing the mixed and entangled yarn as described above is not particularly limited, but may include, for example, a method comprising the following steps. a drawing step of drawing a highly oriented undrawn polyester yarn B having a single yarn fineness of 1.5 to 6.5 dtex and an elongation of 100 to 160% at a draw ratio of 1.1 to 2 times; a composite false-twisting step in which the polyester drawn yarn B obtained in the drawing step and the polyester highly oriented undrawn yarn A having a single yarn fineness of 0.4 to 1.3 dtex and an elongation of 80 to 110% are composite false-twisted at a processing speed of 80 to 1000 m / min and a draw ratio of 1.10 to 1.50 times; The composite false-twisted yarn obtained in the composite false-twisting process is entangled using a fluid nozzle under conditions of an air pressure of 0.1 to 0.6 MPa and an overfeed rate of 1 to 4%.

[0029] To produce a mixed entangled yarn, a drawing step is performed in which highly oriented polyester undrawn yarn B (which will become polyester fiber B constituting the mixed entangled yarn) is drawn at a specific draw ratio to obtain polyester drawn yarn B. As a result, the elongation of highly oriented polyester undrawn yarn A (which will become polyester fiber A constituting the mixed entangled yarn) and polyester drawn yarn B becomes approximately the same, or the polyester drawn yarn B has a slightly lower elongation. The yarn with a higher elongation will have a longer length in the subsequent composite false-twisting step. Then, a composite false-twisting step is performed in which polyester drawn yarn B obtained in the drawing step and highly oriented polyester undrawn yarn A, which will be the other half of the mixed yarn, are drawn together and composite false-twisted while being drawn, to obtain a composite false-twisted yarn. In the composite false-twisted yarn, the highly oriented polyester undrawn yarn A is more likely to be disposed on the outer side (surface side). The composite false-twisted yarn is then subjected to a mixed entanglement step in which the composite false-twisted yarn is mixed and entangled, to obtain a mixed entangled yarn. In the mixed entangled yarn produced in this manner, as described above, the polyester fibers A protrude from the surface of the mixed entangled yarn. Through the above-described steps, the highly oriented polyester undrawn yarn A becomes the polyester fibers A that constitute the mixed entangled yarn, and the highly oriented polyester undrawn yarn B becomes the polyester fibers B that constitute the mixed entangled yarn.

[0030] Here, highly oriented undrawn polyester yarn refers to a multifilament yarn obtained by spinning and winding a polyester polymer at a speed of approximately 2000 to 4000 m / min. Polyester polymers such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate can be used alone or in combination. The polyester polymer may also be a copolymer polyester. Examples of copolymer components include aromatic dicarboxylic acids such as isophthalic acid, 5-alkaliisophthalic acid, and 3,3'-diphenyldicarboxylic acid; aliphatic dicarboxylic acids such as adipic acid, sebacic acid, and succinic acid; aliphatic or alicyclic diols such as diethylene glycol, 1,4-butanediol, and 1,4-cyclohexanediol; and p-hydroxybenzoic acid. The polyester polymer may optionally contain modifiers such as matting agents, stabilizers, flame retardants, and colorants. A highly oriented undrawn polyester yarn is composed of a bundle of multiple highly oriented undrawn fibers. For example, when the fiber cross section is of a concentric core-sheath type, it is preferable that the polyester polymers in the core and sheath are the same, taking into consideration the compatibility of the polymers in the core and sheath.

[0031] The highly oriented undrawn polyester yarn A preferably has a single yarn fineness of 0.4 to 1.3 dtex and an elongation of 80 to 110%, for example. The highly oriented undrawn polyester yarn A more preferably has a single yarn fineness of 0.4 to 1.0 dtex.

[0032] On the other hand, the highly oriented undrawn polyester yarn B preferably has a single yarn fineness of 1.5 to 6.5 dtex and an elongation of 100 to 160%, and more preferably has a single yarn fineness of 1.7 to 6 dtex and an elongation of 110 to 150%.

[0033] Here, the elongation is a value determined based on JIS L1013 8.5.1, and the specific measurement method is as follows.

[0034] Using a constant-speed extension tensile tester (Shimadzu Corporation, Autograph "AGS-5KNG"), the sample length was set to 200 mm, an initial load (8.82 mN x indicated tex) was applied, the sample was attached to the grip of the tensile tester, and the sample was pulled at a pulling speed of 200 mm / min, and the elongation was calculated using the following formula. The average value of 10 times was calculated. Elongation (%) = elongation at maximum strength (mm) / sample length (mm) x 100

[0035] Next, the method for producing a mixed entangled yarn will be described in detail with reference to the schematic diagram in Figure 1. First, the packages YA and YB of the highly oriented polyester undrawn yarns A and B are loaded onto creels, respectively. Next, the highly oriented polyester undrawn yarn B is introduced into a supply roller 1. Then, a drawing step is carried out between the supply roller 1 and a first take-up roller 2, in which the highly oriented polyester undrawn yarn B is drawn.

[0036] In the drawing step, the draw ratio is preferably about 1.1 to 2 times, more preferably about 1.1 to 1.4 times. As a result, the elongation of the polyester highly oriented undrawn yarn A and the polyester drawn yarn B obtained by drawing the polyester highly oriented undrawn yarn B will be approximately the same, or the elongation of the polyester highly oriented undrawn yarn A will be slightly higher. Here, the draw ratio in the drawing step refers to the ratio between the surface speed of the supply roller 1 and the surface speed of the first take-up roller 2 (draw ratio = surface speed of the first take-up roller 2 / surface speed of the supply roller 1). A higher elongation results in a longer yarn length in the subsequent composite false twisting step, and the longer fibers will be more likely to be arranged on the outer side (surface side) of the mixed fiber entangled yarn later. As a result, as described above, protrusions of the polyester fibers A are more likely to be formed on the surface of the mixed fiber entangled yarn. Furthermore, the protrusions protrude from the portions of the polyester fibers A formed on the surface of the mixed fiber entangled yarn where they are loosely entangled. By drawing the highly oriented polyester undrawn yarn B, it is possible to finely adjust the single yarn fineness to a more preferable value, and also to finely adjust the blend ratio of the highly oriented polyester undrawn yarn A and the polyester drawn yarn B. The highly oriented polyester undrawn yarn B may be drawn at room temperature, or may be drawn while applying heat using a heater or the like.

[0037] Next, a composite false-twisting process is carried out in which the drawn polyester drawn yarn B and the highly oriented polyester undrawn yarn A are composite false-twisted under predetermined conditions. Specifically, the polyester drawn yarn B drawn in the drawing process is composite false-twisted with the highly oriented polyester undrawn yarn A, which has a single yarn fineness of 0.4 to 1.3 dtex and an elongation of 80 to 110%, at a processing speed of 80 to 1,000 m / min and a draw ratio of 1.10 to 1.5. Specifically, as shown in FIG. 1, the drawn polyester drawn yarn B and the highly oriented polyester undrawn yarn A are simultaneously introduced to a first take-up roller 2, passed through a heater 3 and a false twisting device 4, and drawn out from a second take-up roller 5, to obtain a composite false-twisted yarn C. The region between the first take-up roller 2 and the second take-up roller 5 in FIG. 1 constitutes the composite false-twist zone. Specifically, the area between the first take-up roller 2 and the false twisting tool 4 is the twisting zone T1, and the area between the false twisting tool 4 and the second take-up roller 5 is the untwisting zone T2.

[0038] In the composite false twisting step, it is preferable to specify the processing speed and the draw ratio. The processing speed refers to the yarn speed when the yarn is drawn off from the second take-up roller 5, i.e., the surface speed of the second take-up roller 5. As described above, the processing speed (yarn speed) is preferably about 80 to 1,000 m / min, and more preferably about 100 to 700 m / min. If the yarn speed is below the above range, the composite false twisted yarn C tends to be too crimped. If the crimp is too strong, the stretchability is strongly expressed, making it unsuitable for producing highly water-repellent fabrics. Furthermore, if the stretchability of the composite false twisted yarn C is strong, the stretchability of the mixed fiber entangled yarn obtained later also becomes strong, and the mixed fiber entangled yarn can be easily stretched. When the mixed fiber entangled yarn is stretched, it assumes a flat shape, and the above-mentioned fine protrusions on the surface of the mixed fiber entangled yarn are lost. Therefore, if the yarn speed is below the above range and the crimp is strong, it becomes difficult to impart the desired water repellency to the woven fabric. On the other hand, if the yarn speed is above the above range, the crimp of the composite false-twisted yarn C tends to become weak. If the crimp is weak, the fiber is not sufficiently crimped, and the fiber shape becomes nearly flat. Therefore, it becomes difficult for the polyester fiber A to form protrusions on the surface of the mixed fiber entangled yarn, making it difficult to impart the desired water repellency to the woven fabric.

[0039] In the composite false twisting process, the draw ratio is preferably in the range of about 1.10 to 1.50, and more preferably in the range of about 1.10 to 1.30. The draw ratio in the composite false twisting process refers to the ratio between the surface speed of the first take-up roller 2 and the surface speed of the second take-up roller 5 (draw ratio = surface speed of the second take-up roller 5 / surface speed of the first take-up roller 2).

[0040] In the composite false twisting step, the drawn polyester yarn B and the highly oriented polyester undrawn yarn A are composite false twisted using an appropriate false twisting tool, preferably at a predetermined processing speed and a predetermined draw ratio. False twisting methods are generally broadly divided into spindle and friction methods, but either method may be used. The false twisting conditions, heater temperature, degree of twist, etc., can be set appropriately.

[0041] After the composite false twisting step, the composite false twisted yarn C is guided by the second take-up roller 5 to the fluid nozzle 6, where it is mixed and entangled using the fluid nozzle 6. There are no particular restrictions on the fluid nozzle, but an interlace nozzle is generally preferred.

[0042] As for the conditions for mixed fiber entanglement, as described above, the air pressure is preferably set to about 0.1 to 0.6 MPa, and the overfeed rate is preferably set to about 1 to 4%. The overfeed rate is calculated by the formula: Overfeed rate = (V1 - V2) / V2 × 100 (%), where V1 is the yarn speed immediately before being introduced into the fluid nozzle and V2 is the yarn speed immediately after passing through the fluid nozzle. In the case of Figure 1, the overfeed rate is calculated by the formula: Overfeed rate = (Surface speed of second take-up roller 5 - Surface speed of third take-up roller 7) / Surface speed of third take-up roller 7 × 100 (%). Since polyester fiber A is distributed in large amounts on the outer side of the composite false twist yarn C, the above-mentioned air retention layer with protrusions made of polyester fiber A is formed by mixed fiber entanglement under predetermined conditions.

[0043] The mixed entangled yarn passes through the third take-up roller 7 and is then wound into a package 9 by the winding roller 8. A mixed entangled yarn having an entanglement number in the range of approximately 90 to 200 pcs / m is considered to have an appropriate mixed entanglement. In addition to the entanglement number, it is also preferable that the crimp change rate satisfy a predetermined range as a measure of appropriate mixed entanglement. When a yarn is mixed entangled, the fibers become entangled, reducing the crimp rate of the entire yarn. Therefore, determining the extent to which the crimp rate has decreased provides a measure of appropriate mixed entanglement. The crimp change rate is preferably in the range of 40 to 70%. The crimp change rate is calculated using the formula: crimp change rate = (crimp rate of the resulting mixed entangled yarn) / (crimp rate of composite false-twisted yarn C) × 100 (%).

[0044] If the crimp change rate is less than 40%, the entanglement state becomes strong, making it difficult to obtain the above-mentioned fine protrusions, and it becomes difficult to impart high water repellency to the woven fabric.If the crimp change rate is more than 70%, the entanglement state becomes easily unraveled, causing misalignment within the yarn and making it difficult to obtain fine protrusions.

[0045] The mixed entangled yarn used in the present invention may be produced according to the above-mentioned production method, or may be a commercially available product if it is available. When polyester drawn yarn B is commercially available, the mixed entangled yarn used in the present invention can also be obtained by performing the composite false twisting step and the mixed entanglement step using commercially available polyester drawn yarn B and polyester highly oriented undrawn yarn A without performing the drawing step.

[0046] [Water-repellent fabric] The water-repellent fabric of the present invention contains the mixed fiber entangled yarn described above, and because protrusions of polyester fiber A are formed on the surface of the fabric, water droplets can be supported by the protrusions. Furthermore, because the protrusions are fine, when water splashes on the fabric, the water droplets formed are relatively small and nearly spherical, making it easy to remove the water droplets from the surface of the fabric. Furthermore, in the present invention, by setting the cover factor of the entire fabric and the cover factor of the mixed fiber entangled yarn in the fabric within specific ranges, water droplets on the fabric can be removed more quickly and migration of water droplets into the interior of the fabric can be effectively prevented. Therefore, even when wet, the temperature inside the garment is less likely to drop, and the garment exhibits high heat retention.

[0047] In the present invention, the mixed fiber entangled yarn may be used in at least a part of the warp and / or weft yarns constituting the woven fabric, but from the viewpoint of providing excellent water repellency and quickly removing water droplets on the woven fabric to effectively prevent the water droplets from migrating into the interior of the woven fabric, it is preferable that the mixed fiber entangled yarn be used in both the warp and weft yarns. The amount of the mixed fiber entangled yarn used in the woven fabric is preferably 30 to 100 mass%, more preferably 40 to 100 mass%, and even more preferably 45 to 100 mass%.

[0048] The water-repellent fabric of the present invention has a water-repellent agent attached thereto. The water-repellent agent may be attached to at least one surface of the fabric (the outer surface when used as clothing). In the present invention, remarkably excellent water repellency is exhibited by the synergistic effect of the protrusions on the fabric surface and the water-repellent agent, and excellent water repellency can also be exhibited by using a conventionally known, inexpensive fluorine-based water repellent agent.

[0049] The water repellent used in the present invention is not particularly limited, but a fluorine-based water repellent is preferred from the viewpoints of workability and cost. Specifically, a fluorine-based water repellent composed of a fluorine-based compound having a polyfluoroalkyl group (Rf group) in its chemical structure is preferred. The Rf group refers to a group in which two or more hydrogen atoms of an alkyl group are substituted with fluorine atoms. The Rf group preferably has 2 to 20 carbon atoms, more preferably 2 to 8 carbon atoms, and even more preferably 1 to 6 carbon atoms. The Rf group may have either a linear or branched chain structure. In particular, in the case of a branched chain structure, the branched chain portion is preferably present at the terminal of the Rf group, and the Rf group has a short chain of about 1 to 8 carbon atoms, more preferably 1 to 6 carbon atoms. The Rf group is preferably a group in which all hydrogen atoms of an alkyl group are substituted with fluorine atoms (perfluoroalkyl group).

[0050] The fluorine-based compound is preferably a copolymer obtained by polymerizing the above-mentioned perfluoroalkyl group-containing polymer with another polymerizable monomer by a known polymerization method. Examples of the other polymerizable monomer include acrylic acid, methacrylic acid, styrene, and vinyl chloride. If necessary, an acrylic compound, a vinyl acetate compound, a melamine compound, etc. may be appropriately mixed.

[0051] Commercially available fluorine-based water repellents can be used, such as "Asahi Guard (trade name)" manufactured by Asahi Glass Co., Ltd. and "NK Guard (trade name)" manufactured by Nicca Chemical Co., Ltd. As the fluorine-based water repellent, a fluorine-based water repellent that does not contain perfluoroalkylcarboxylic acid is particularly suitable from the viewpoint of environmental protection. The fluorine-based water repellent is preferably used in the form of an aqueous emulsion.

[0052] Furthermore, from an environmental perspective, fluorine-free water repellents may be used. Examples of non-fluorine-based water repellents include hydrocarbon-based, silicone-based, and wax-based. Commercially available non-fluorine-based water repellents can be used. Examples of hydrocarbon-based water repellents include "NEOSEED (product name)" manufactured by NICCA Chemical Co., Ltd. and "Palladium ECO (product name)" manufactured by Ohara Palladium Co., Ltd.; silicone-based water repellents include "DRYPON 600E (product name)" manufactured by NICCA Chemical Co., Ltd. and "PORON (product name)" manufactured by Shin-Etsu Chemical Co., Ltd.; and wax-based water repellents include "TH-44 (product name)" manufactured by NICCA Chemical Co., Ltd. and "NEOLAX (product name)" manufactured by Takamatsu Oil & Fats Co., Ltd. Hydrocarbon-based water repellents, which have high washing durability, are particularly suitable.

[0053] The amount of water repellent to be applied to the fabric may be appropriately determined depending on the type of water repellent to be used, the desired level of water repellency, etc., but the amount of solids contained in the water repellent is, for example, 0.05 to 10 g / m 2 , preferably 0.1 to 7 g / m 2 Examples include:

[0054] The cover factor (CF) of the entire woven fabric of the water-repellent woven fabric of the present invention is 2200 to 4000, preferably 2250 to 3800, and more preferably 2300 to 3500. The cover factor (CF) of a woven fabric is a numerical representation of the density of the woven fabric, and the cover factor (CF) of the entire woven fabric in the present invention is a value calculated for all yarns contained in the water-repellent woven fabric using the following formula (1):

[0055] CF=WAD×DTA 1 / 2 +WED×DTE 1 / 2 (1) DTA: warp multifilament fineness (dtex) DTE: Weft multifilament fineness (dtex) WAD: Warp density (threads / 2.54cm) WED: Weft density (threads / 2.54cm)

[0056] The fineness of the multifilament yarn is measured and calculated according to the method specified in 8.3.1 Correct Fineness of JIS L-1013: 2010. In addition, in any square of 2.54 cm in the warp direction and 2.54 cm in the weft direction of the water-repellent fabric, the average value of the fineness of the multifilament yarns of all warp yarns placed is defined as DTA, and the average value of the fineness of the multifilament yarns of all weft yarns placed is defined as DTE. The warp density and weft density are measured and calculated in accordance with JIS L 1096:2010 8.6.1A. Both warp density and weft density refer to the finished weave density.

[0057] By satisfying the above-mentioned range of cover factor (CF), the water-repellent fabric of the present invention has a high density, and water droplets on the surface of the fabric are less likely to migrate to the interior, and water droplets are supported by protrusions formed on the surface of the fabric by the mixed fiber entangled yarns, thereby providing excellent water repellency.

[0058] If the cover factor (CF) of the entire fabric is below 2200, the weaving points become coarse and the number of voids within the fabric increases. As a result, water droplets tend to fall into the voids, making it difficult to expect an improvement in water repellency and resulting in poor heat retention. On the other hand, if the cover factor (CF) exceeds 4000, the constraint by the weaving points becomes stronger, so the fine protrusions on the surface of the mixed fiber entangled yarn tend to be lost. As water droplets are not retained on the protrusions, water repellency decreases, and large water droplets tend to form, making it difficult to expect an improvement in heat retention.

[0059] Furthermore, the water-repellent fabric of the present invention has a cover factor (CF) of the mixed entangled yarn in the fabric satisfying 1100 to 2600, preferably 1300 to 2500, and more preferably 1500 to 2500. The cover factor (CF) of the mixed entangled yarn in the fabric in the present invention is a value calculated by the above formula (1) for only the mixed entangled yarn contained in the water-repellent fabric, and is calculated as follows: DTA: fineness (dtex) of the mixed entangled yarn in the warp, DTE: fineness (dtex) of the mixed entangled yarn in the weft, WAD: yarn density of the mixed entangled yarn in the warp (threads / 2.54 cm), WED: density of the mixed entangled yarn in the weft (threads / 2.54 cm).

[0060] By satisfying the above-mentioned range of cover factor (CF) of the mixed fiber entangled yarn in the water-repellent fabric of the present invention, the mixed fiber entangled yarn is present at a high density on the surface of the fabric, and protrusions of the mixed fiber entangled yarn are present in sufficient numbers on the surface of the fabric. Therefore, water droplets are supported by the protrusions, thereby reducing contact between the fabric surface and water droplets. Furthermore, the presence of the above-mentioned air retention layer effectively prevents water droplets from migrating into the interior of the fabric, resulting in a significant improvement in water-repellent performance similar to the so-called lotus effect.

[0061] If the cover factor (CF) of the mixed fiber entangled yarn in the woven fabric is below 1100, the number of protrusions due to the mixed fiber entangled yarn on the woven fabric surface will be reduced, or the protrusions will not be densely packed together. As a result, water droplets will not be supported by the protrusions, resulting in a decrease in water repellency, and even if the entire woven fabric is highly dense, the area of ​​direct contact between the woven fabric surface and water droplets will be large, causing a decrease in the surface temperature of the fabric and resulting in poor thermal insulation of the temperature inside the garment. On the other hand, if the cover factor (CF) is above 2600, the number of protrusions on the woven fabric surface will be too large, which will tend to crush and lose the fine protrusions. As water droplets are not held on the protrusions, water repellency will be reduced, and large water droplets will be more likely to form, making it difficult to expect an improvement in thermal insulation of the temperature inside the garment.

[0062] The weave of the woven fabric is not particularly limited, and may be, for example, plain weave, twill weave, or satin weave. When strength or a thick texture is desired, for example, a multi-layer weave or ripstop weave may be used.

[0063] The weight of the water-repellent fabric of the present invention is 80 to 300 g / m 2 is preferable, and more preferably 100 to 250 g / m 2 The fabric weight is 80g / m 2 If the weight is less than 300g / m, the fabric may be too thin and may not be able to fully retain heat. 2 If the thickness exceeds this value, the fabric will be too thick and the water repellency effect of the protrusions on the fabric surface will not be fully exhibited.

[0064] The water-repellent fabric of the present invention has excellent water repellency, specifically, a water drop rolling angle of 40 degrees or less. The water drop rolling angle is an index used to evaluate water repellency, such as the lotus effect, and excellent water repellency in this invention is synonymous with a high lotus effect. The water drop rolling angle is the angle at which the water drop begins to roll when 0.2 mL of water is gently dropped onto a horizontal sample (woven fabric) mounted on a horizontal plate and the plate is then gently tilted. If the water drop rolling angle exceeds 40 degrees, it becomes difficult to shake off water droplets, such as rainwater, from the fabric without losing their shape, and many water droplets remain on the fabric, resulting in a decrease in heat retention. To achieve a water drop rolling angle of 40 degrees or less, for example, the cover factor (CF) of the entire fabric and the mixed fiber entangled yarn in the fabric can be set within the above range, and the content of the mixed fiber entangled yarn in the fabric can be set within the above range.

[0065] The water-repellent fabric of the present invention has excellent thermal insulation properties for the temperature inside clothing, and an index of this thermal insulation property is preferably a thermal insulation rate of 48% or more, more preferably 50% or more, as measured by the measurement method described below. If the thermal insulation rate is 48% or more, even when the fabric is used as clothing and the outside of the clothing becomes wet, a drop in temperature inside the clothing due to water droplets is suppressed, and the fabric can exhibit a thermal insulation effect.

[0066] The heat retention rate, which indicates the heat retention of the water-repellent fabric of the present invention, is calculated using the following formula (2) by wrapping a sample fabric around a heat transfer medium and applying shower water (10°C) to the sample for 30 minutes, measuring the temperature change rate of the heat transfer medium with a thermographic camera. Heat retention rate H (%) = Temperature after 30 minutes (Tr (℃)) ÷ Initial temperature (T0 (℃)) × 100 (2) A cylindrical glass bottle filled with water was used as the heat transfer medium for a simple and stable evaluation, and the initial temperature was set to 60±3°C by adjusting the temperature of the water. A matte black painted steel lid was used as the lid for the glass bottle, allowing the temperature of the water inside the bottle to be transferred to the steel lid, which has high thermal conductivity. The temperature change rate of this lid was measured using a thermographic camera.

[0067] [Method of manufacturing water-repellent fabric] The water-repellent fabric of the present invention can be obtained by weaving the mixed and entangled yarn to obtain a green fabric, and then post-processing and water-repellent finishing the same. Weaving can be carried out using a known loom, and the preparation step prior to weaving can also be carried out using known equipment.

[0068] In post-processing, the grey fabric is first scoured and relaxed. Scouring and relaxation can be carried out at temperatures of 80 to 130°C using a continuous or batch method. Normally, it is preferable to carry out the process using a batch method at 100°C or below, and it is particularly preferable to use a high-pressure jet dyeing machine equipped with a jet nozzle. After scouring and relaxing, the fabric is preset. Presetting is usually done by dry heat treatment at 170-200°C for 30-120 seconds using a pin tenter. After presetting, the fabric is dyed according to the usual method, and then a final setting is carried out if necessary.

[0069] After the post-processing, the woven fabric is subjected to a water-repellent treatment. In the water-repellent treatment, first, an aqueous solution containing a water-repellent agent is prepared. Next, the aqueous solution is applied to the post-processed woven fabric using a padding method, spraying method, kiss-roll coating method, slit coating method, or the like, followed by a dry heat treatment at 105 to 190°C for 30 to 150 seconds. The aqueous solution may also contain a crosslinking agent, softener, antistatic agent, or the like, as needed. In addition to the water-repellent treatment, the woven fabric may be subjected to known treatments such as antibacterial treatment, dyeing treatment, water-repellent back-water absorption treatment, UV protection treatment, heat storage treatment, bacteriostatic treatment, antibacterial and deodorizing treatment, deodorizing treatment, stain-resistant treatment, mosquito-repellent treatment, calendaring treatment, and printing treatment. However, it is preferable to perform the treatment under conditions that allow the protrusions to be properly maintained.

[0070] The water-repellent fabric of the present invention has excellent water repellency and heat retention properties, and even when wet, water quickly flows off the fabric, preventing the wearer's body temperature from dropping and providing high heat retention. Therefore, it is suitable for use in fields such as uniforms, sportswear, and outdoor products used outdoors. [Example]

[0071] The present invention will be specifically described below with reference to examples. The present invention is not limited to these examples. The methods for measuring or evaluating each physical property are as follows.

[0072] 1. Single yarn size, total size The single yarn fineness and total fineness of polyester fiber A and polyester fiber B in the mixed entangled yarn, and the single yarn fineness and total fineness of the mixed entangled yarn were measured according to the provisions of JIS L1013 8.3.1.

[0073] 2.Crimp rate The resulting woven fabric was unraveled, and the mixed and intertwined yarn was collected as a sample, which was measured by the above method.

[0074] 3. Number of interlacings of mixed fiber interlacing yarn The resulting woven fabric was unraveled, and the mixed entangled yarn was collected and used as a sample. The number of entanglements (pieces / m) of the mixed entangled yarn was measured based on the JIS L1013 8.15 hook method.

[0075] 4. Water repellency of fabric surface (water droplet rolling angle) The water droplet rolling angle was measured by gently dropping 0.2 mL of water onto a horizontal sample (the obtained water-repellent fabric) mounted on a horizontal plate, then gently tilting the plate, and measuring the angle at which the water droplet began to roll.

[0076] 5. Thermal insulation of fabrics (heat retention rate) Measurements were performed as described above. A cylindrical glass bottle with a diameter of 5 cm and a height of 14 cm was filled with 210 cc of water at 80°C as a heat transfer medium, and the initial temperature was set to 63°C. A matte black-painted steel lid was attached to the glass bottle. The resulting water-repellent fabric sample was then wrapped around the entire side of the bottle, without overlapping, and secured in place. The glass bottle wrapped around the sample was then placed horizontally and secured, and the surface temperature of the lid was measured with a thermographic camera and recorded as the initial temperature T0 (°C). Next, a shower of water (10°C) was sprayed from above on the glass bottle wrapped around the sample at a precipitation rate of 30 mm / h for 30 minutes, after which the surface temperature of the lid was measured with a thermographic camera and recorded as the temperature Tr (°C) 30 minutes after the rainfall. The heat retention rate H (%) was calculated from the obtained data.

[0077] Example 1 Highly oriented polyester undrawn yarn A, having an elongation of 103%, a single yarn fineness of 0.54 dtex, and a total fineness of 45 dtex (84 filaments), and highly oriented polyester undrawn yarn B, having an elongation of 130%, a single yarn fineness of 3.25 dtex, and a total fineness of 39 dtex (12 filaments), were prepared. Next, highly oriented polyester undrawn yarns A and B were subjected to the method for producing a mixed fiber entangled yarn as shown in Figure 1. A disk-type false twisting device 4 was used, and a mixed fiber entangled yarn of 65 dtex (96 filaments) was obtained under the following composite false twisting conditions and mixed fiber entanglement conditions. In the mixed fiber entangled yarn, the mass ratio (A / B) of polyester fiber A to polyester fiber B was 57 / 43. Furthermore, the obtained mixed fiber entangled yarn had continuous protrusions formed by loops and slack of polyester fiber A, and an air retention layer formed by thin polyester fiber A loosely entangled was formed inside the protrusions (inner side of the mixed fiber entangled yarn). <Composite false twist conditions> Surface speed of supply roller 1: 211 m / min Stretching ratio of polyester highly oriented unstretched yarn B: 1.15 times Surface speed of first take-off roller 2: 243 m / min Heater 3 temperature: (contact heater) 165℃ Twist direction: Z direction Disc structure: 1-6-1 K value: 1.0 Stretching ratio during false twisting: 1.24 times Surface speed of the second take-off roller 5: 300 m / min <Conditions for interlacing mixed fibers> Fluid nozzle 6: Interlaced nozzle Air pressure: 0.11 MPa Overfeed rate: 1.5% Surface speed of the third take-off roller 7: 295 m / min

[0078] Next, using a water jet loom (manufactured by Tsudakoma Kogyo Co., Ltd.), the mixed and entangled yarn obtained above was arranged in an untwisted state as the warp and weft, and a plain weave was woven.

[0079] The resulting greige fabric was scoured and then dyed with a disperse dye. A 5% aqueous dispersion of a fluorine-based water-repellent emulsion (Asahi Guard AG-E092 (trade name) manufactured by Asahi Glass Co., Ltd.) was then applied to the fabric surface using a padding method (pickup rate: 40%). The fabric was then dried and heat-treated at 170°C for 40 seconds to obtain a water-repellent fabric with a warp density of 169 threads / 2.54 cm, a weft density of 126 threads / 2.54 cm, and a cover factor of 2378 for the entire fabric and the mixed and entangled yarns in the fabric.

[0080] Example 2 A water-repellent fabric was obtained in the same manner as in Example 1, except that polyester false-twisted crimped yarn 130 dtex 96 filament was used as the weft yarn, the weave was changed to a 2 / 1 twill weave, and the weave density was changed.The fabric had a warp density of 191 threads / 2.54 cm, a weft density of 105 threads / 2.54 cm, a cover factor of the entire fabric of 2737, and a cover factor of the mixed fiber entangled yarn in the fabric of 1540.

[0081] Example 3 A water-repellent fabric was obtained in the same manner as in Example 1, except that polyester drawn yarn 33 dtex 72 filament was used as the warp yarn and the weave density was changed. The warp density was 207 threads / 2.54 cm, the weft density was 138 threads / 2.54 cm, the cover factor of the entire fabric was 2302, and the cover factor of the mixed entangled yarn in the fabric was 1113.

[0082] (Comparative Example 1) Instead of the mixed interlaced yarn, polyester drawn yarn consisting of only one type of yarn, with a single yarn fineness of 0.42 dtex and a total fineness of 71 dtex (168 filaments), was used as the warp and weft. The polyester drawn yarn had a crimp rate of 37.0% and an interlace count of 108 threads / m (interlaced interlace). Otherwise, in the same manner as in Example 1, a plain weave water-repellent fabric was obtained with a warp density of 160 threads / 2.54 cm, a weft density of 123 threads / 2.54 cm, and an overall fabric cover factor of 2179. The surface of the obtained fabric was free of protrusions due to the mixed interlaced yarn.

[0083] (Comparative Example 2) A water-repellent fabric was obtained in the same manner as in Example 1, except that the same polyester drawn yarn with a total fineness of 71 dtex and 168 filaments as in Comparative Example 1 was used as the warp yarn and the weave density was changed. The warp density was 158 threads / 2.54 cm, the weft density was 121 threads / 2.54 cm, the cover factor of the entire fabric was 2210, and the cover factor of the mixed entangled yarn in the fabric was 976.

[0084] (Comparative Example 3) A water-repellent fabric was obtained in the same manner as in Example 1, except that the same polyester drawn yarn with a total fineness of 71 dtex and 168 filaments as in Comparative Example 1 was used as the warp yarn, the weave was changed to a 2 / 1 twill weave, and the weave density was changed.The fabric had a warp density of 170 threads / 2.54 cm, a weft density of 140 threads / 2.54 cm, a cover factor of the entire fabric of 2105, and a cover factor of the mixed entangled yarn in the fabric of 1129.

[0085] [Test Results] The evaluation results for the water-repellent fabrics of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1.

[0086] [Table 1]

[0087] The water-repellent fabrics obtained in Examples 1 to 3 were fabrics containing mixed entangled yarns, and the cover factors of the entire fabric and the mixed entangled yarns in the fabric satisfied specific ranges. As a result, fine protrusions were appropriately formed on the surface of the fabric, and the water droplet rolling angle was small, resulting in excellent water repellency and good heat retention.

[0088] In contrast, the water-repellent fabric of Comparative Example 1 did not use the mixed entangled yarn defined in the present invention, so that fine protrusions were not formed on the surface of the fabric, and the water droplet rolling angle was large, resulting in poor water repellency.In addition, water did not flow off the fabric quickly, and many water droplets remained, resulting in poor heat retention.

[0089] The water-repellent fabric of Comparative Example 2 had a low cover factor of the mixed entangled yarn in the fabric, so that protrusions of the mixed entangled yarn were not sufficiently formed on the surface of the fabric, resulting in poor water repellency. In addition, water droplets remained on the fabric, resulting in insufficient heat retention. The water-repellent fabric of Comparative Example 3 had a small cover factor for the entire fabric, and therefore the fabric was not high-density and water droplets remained in the voids within the fabric, resulting in insufficient water repellency and poor heat retention. [Explanation of symbols]

[0090] 1 Supply roller 2 First take-off roller 3 Heater 4 False twisting tool 5 Second take-off roller 6. Second Delivery Roller 7 Third take-off roller 8 Winding roller 9. Package of mixed interlaced yarn YA Package of highly oriented undrawn polyester yarn A YB Polyester highly oriented undrawn yarn B package

Claims

1. A woven fabric comprising a mixed fiber entangled yarn composed of a polyester fiber A having a single yarn fineness of 0.2 to 0.9 dtex and a polyester fiber B having a single yarn fineness of 1.0 to 5.0 dtex, the mass ratio (A / B) of polyester fiber A to polyester fiber B is in the range of 20 / 80 to 80 / 20; On the surface of the mixed intertwined yarn, protrusions are formed by polyester fibers A, The cover factor of the entire woven fabric is 2200 to 4000, and the cover factor of the mixed fiber entangled yarn in the woven fabric is 1100 to 2600, A water-repellent fabric having a water droplet rolling angle of 40 degrees or less.

2. The water-repellent fabric according to claim 1 , wherein both the warp and weft of the fabric contain interlaced yarns.

3. Basis weight: 80 to 300 g / m ２ The water-repellent fabric according to claim 1 or 2,

4. 3. The water-repellent fabric according to claim 1, which has a heat retention rate of 48% or more.

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