Knitted fabric

Abstract

To provide a knitted fabric capable of suppressing stuffy feeling, and suppressing sticky feeling and cold feeling after sweating by shortening drying time.SOLUTION: A knitted fabric has two-layer structure. Moisture absorbing and desorbing parameter ΔMR at least on one surface is 2.0% or more. Surface area occupancy ratio of fibers (fibers A) having 2.0% or less of moisture absorptivity at temperature of 20°C, relative humidity of 65% in the knitted fabric is 50% or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to knitted fabrics.

Background Art

[0002] As people desire a more comfortable life, the requirements for fiber materials are also becoming more sophisticated. Therefore, the sophistication of fiber materials to achieve the required comfort is being actively pursued.

[0003] Generally, the comfort in clothing applications varies depending on the environment and atmosphere in which the material is used. Among these, maintaining the environment between the clothing and the skin, that is, the environment in the clothing interior space, in an appropriate state is an important factor directly related to comfort. In this clothing interior space environment, factors affecting people's comfort include the temperature and humidity inside the clothing. However, the range of interior clothing temperature and humidity at which people can feel comfortable is limited.

[0004] When moving from the outdoor environment to an indoor environment where the temperature and other conditions are adjusted, sweating may occur due to the sudden change in the atmosphere, which may impair comfort regardless of the season. Therefore, even when the atmosphere changes suddenly in this way, adjusting the interior clothing temperature and humidity to a comfortable range is an important factor in determining the comfort of clothing materials close to the skin surface. In particular, in the high-temperature and high-humidity environment in summer when the average temperature continues to rise year by year, when moving from indoors to outdoors, it becomes stuffy and sticky due to sweating, impairing comfort. Also, even when moving from outdoors to indoors, the humidity change inside the clothing does not follow the change, and one may feel cold sweat due to the sweaty clothing, impairing comfort even in a comfortable atmosphere. That is, in order to eliminate the discomfort caused by this sweating, a material that keeps the humidity change inside the clothing constant is required. As clothing materials corresponding to this, there have been proposals for materials with excellent breathability, hygroscopicity, and rapid water absorption and drying properties.

[0005] For example, Patent Document 1 proposes a single circular knitted fabric suitable for sportswear and the like, which has stretchability, lightweight bulkiness, shape stability, etc., by adopting a two-layer structure including a double-knit part where the back yarn is arranged in a shape similar to the surface yarn inside the first row of the surface yarn, and a bridging part where the back yarn forms a bridging shape between the double-knit parts.

[0006] Also, Patent Document 2 proposes a two-layer knitted fabric consisting of a front surface and a back surface, where the front surface and the back surface are connected at binding points, and a thin and lightweight knitted fabric for underwear is obtained by arranging a heat-insulating material on the front surface and a moisture-absorbing material on the back surface.

[0007] Furthermore, Patent Document 3 proposes an underwear made of a double circular knitted fabric of a drawstring knit, which contains a polyamide-based bulked yarn with a moisture absorption and desorption parameter ΔMR of 2.5% or more, the front knitted fabric is composed of fibers with a larger total fineness than the back knitted fabric, and the areal density of the front knitted fabric is made larger than that of the back knitted fabric, so that it has high hygroscopicity, a soft texture, and a comfortable wearing feeling.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0009] As discomfort caused by sweating inside clothes, there is discomfort caused by gaseous sweat and that caused by liquid sweat. First, when gaseous sweat is generated due to insensible perspiration or sweating and the humidity inside the clothes increases, a stuffy feeling may occur. Furthermore, when sweating continues, since the humidity inside the clothes is high, the sweat becomes liquid instead of gaseous. When liquid sweat is generated inside the clothes, an uncomfortable feeling such as a sticky feeling may occur. Also, when the clothes get wet due to the generation of liquid sweat, for example, when moving from outdoors to indoors in summer, that is, when moving from a high-temperature environment to a low-temperature environment, a feeling of cold due to the wet clothes, so-called sweat chill, may occur.

[0010] In the fabric of Patent Document 1, since the back yarn has a structure that bridges between double-knit parts, it is possible to suppress the sticky feeling for liquid sweat generated on the skin side by the water absorption effect of the bridging structure. On the other hand, when the moisture absorption and desorption properties of the fibers constituting the fabric are low, when gaseous sweat is generated, it cannot be adjusted by the fabric, the humidity inside the clothes increases, and the problem is that a stuffy feeling occurs. Also, even when the fabric is made of fibers with high moisture absorption and desorption properties, the problem is that sweat chill occurs.

[0011] Also, in the fabric of Patent Document 2, since a moisture-absorbing material is arranged on the skin side, it has an effect of suppressing the stuffy feeling for gaseous sweat generated inside the clothes. On the other hand, since rayon or nylon having a hydrophilic functional group is used as the fiber constituting the fabric and the interaction with water is strong, when liquid sweat is generated inside the clothes, it is difficult to discharge it outside the clothes, and the problem is that a sticky feeling and sweat chill occur.

[0012] Similarly, in the fabric of Patent Document 3, since polyamide having moisture absorption is used as the fiber constituting the fabric, it has an effect of suppressing the stuffy feeling for gaseous sweat. On the other hand, since polyamide has a strong interaction with water, the problem is that a sticky feeling and sweat chill occur due to liquid sweat.

[0013] Therefore, the present invention aims to solve the above problems, and can provide a knitted fabric that can suppress the stuffy feeling, suppress the sticky feeling by shortening the drying time, and also suppress the cold sweat by suppressing the stuffy feeling and shortening the drying time.

Means for Solving the Problems

[0014] As a result of intensive studies by the present inventors, in order to solve the above problems, the inventors have completed an invention having the following configuration. (1) A knitted fabric having a two-layer structure, wherein on at least one side, the area occupancy rate of a fiber (fiber A) having a moisture absorption and desorption parameter ΔMR of 2.0% or more and a moisture absorption rate of 2.0% or less at a temperature of 20°C and a relative humidity of 65% is 50% or more. (2) The knitted fabric according to (1), which contains a fiber (fiber B) having a moisture absorption and desorption parameter ΔMR of less than 2.0%. (3) The knitted fabric according to (2), wherein on the side opposite to the side where the area occupancy rate of the fiber A is 50% or more, the area occupancy rate of the fiber B is 50% or more. (4) The ratio d A of the single fiber fineness (d B ) of the fiber A to the single fiber fineness (d B ) of the fiber B is 0.01 or more and less than 1.0. The knitted fabric according to (2) or (3). A (5) The air permeability by the Frazier method (JIS L1096: 2010 "Test Methods for Fabrics and Knitted Fabrics") is 10 cm 3 / (cm 2 ·s) or more and 250 cm 3 / (cm 2 ·s) or less. The knitted fabric according to any one of (1) to (4). (6) The fiber A is a sea-island composite fiber, and a hygroscopic polymer is disposed in the island portion in the cross section of the sea-island composite fiber. The ratio L / R of the radius L of the circumscribed circle including all the island portions disposed on the outermost periphery to the fiber radius R is 0.5 or more and 0.7 or less. The knitted fabric according to any one of (1) to (5). ​(7) In the cross-section of the core-sheath composite fiber, the ratio I / C of the area I of the island part to the area C of the circumscribed circle including all the island parts arranged on the outermost periphery is 0.5 or more and 0.9 or less, which is the knitted fabric according to (6). (8) A garment made of the knitted fabric according to any one of (1) to (7). (9) The garment according to (8), wherein the surface with an area occupancy rate of 50% or more of the fiber A is the garment skin surface.

Advantages of the Invention

[0015] According to the present invention, it is possible to provide a knitted fabric that suppresses a stuffy feeling, suppresses a sticky feeling by shortening the drying time, and also suppresses cold sweat. In particular, the knitted fabric of the present invention can be suitably used as clothing for use in summer.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0017] The knitted fabric of the present invention is a knitted fabric having a two-layer structure, and on at least one side, the area occupancy rate of a fiber (hereinafter referred to as fiber A) having a moisture absorption and desorption parameter ΔMR of 2.0% or more and a moisture absorption rate of 2.0% or less at a temperature of 20°C and a relative humidity of 65% is 50% or more.

[0018] <Knitted fabric> It is important that the fabric of the present invention is a two-layer fabric. In a two-layer fabric, the types and ratios of the fibers constituting one side and the other side are different, that is, it has different structures on both sides of the fabric. Therefore, by using a two-layer fabric, a structural difference occurs on both sides of the fabric, enabling gaseous sweat and liquid sweat to be discharged from inside the clothing to the outside of the clothing, and it becomes possible to suppress a stuffy feeling and a sticky feeling. As the weave of the two-layer fabric, a weave structure having different structures on both sides of the fabric is preferably used. For example, single circular weaves such as reversible plain weave, back yarn bridge structure, inlay plain weave, plating plain weave, double circular weaves such as Milano rib, pongee loom, single pique, single warp knits such as half tricot, queen's cord, and double-sided warp knits such as double tricot can be mentioned. Among them, from the viewpoint of discharging gaseous sweat and liquid sweat from inside the clothing to the outside of the clothing, that is, suppressing a stuffy feeling, a sticky feeling, and also suppressing cold sweat, single circular weaves and single warp knits with few air layers formed between one side and the other side of the fabric are preferred.

[0019] The knitted fabric of the present invention has an area occupancy rate of fiber A of 50% or more on at least one side of the two-layer knitted fabric. By setting it within such a range, the knitted fabric can adsorb and / or absorb moisture such as sweat due to the high moisture absorption of fiber A, and discharge gaseous sweat (hereinafter referred to as "moisture release"). Further, in the clothing made of the knitted fabric of the present invention, it can absorb and release sweat inside the clothing, adjust the humidity inside the clothing within a comfortable range, and suppress the feeling of stuffiness. From this perspective, the higher the area occupancy rate of fiber A, the more effective it is in adjusting the humidity of the environment inside the clothing. Therefore, the preferable range of the area occupancy rate of fiber A is 75% or more, and it is more preferable to be 90% or more in a period of high temperature and high humidity such as midsummer when sweating is abundant or when there is a rapid change in the atmosphere. Also, since the higher the area occupancy rate of fiber A, the higher the effect of suppressing the feeling of stuffiness, the area occupancy rate of fiber A may be 100%. The area occupancy rate is determined by differentiating the types of fibers constituting the knitted fabric by the method described in JIS L1030-1:2012 "Test method for mixing ratio of textile products - Part 1: Fiber identification", dyeing the knitted fabric in advance with dyes corresponding to the types of fibers, photographing the surface of the knitted fabric with a digital microscope at a magnification of 100 to 500 times, binarizing the image by adjusting the threshold according to the degree of dyeing of fiber A and other fibers, and obtaining it by image analysis.

[0020] The moisture absorption and desorption parameter ΔMR of fiber A is 2.0% or more. The moisture absorption and desorption parameter ΔMR referred to here is an index of the hygroscopicity of the fiber, which is the difference between the moisture absorption rate of the fiber at a high temperature and high humidity environment (temperature 30°C, relative humidity 90%) and the moisture absorption rate of the fiber under standard conditions (temperature 20°C, relative humidity 65%). The higher this ΔMR, the higher the hygroscopicity of the fiber. In particular, in an environment where sweating is likely to occur, such as a high temperature and high humidity environment in summer, where gaseous sweat is likely to be generated, since the ΔMR of fiber A is 2.0% or more, the fiber can adsorb and absorb (hereinafter referred to as "moisture absorption") gaseous sweat, and the feeling of stuffiness can be suppressed. A more preferable ΔMR is 4.0% or more. In this case, since more water can be retained in the fiber structure, moisture absorption becomes faster, and the effect of suppressing the feeling of stuffiness during sweating is further enhanced. An even more preferable range of ΔMR is 6.0% or more. There is no particular upper limit to the range of ΔMR, and the higher it is, the more preferable it is. However, the level achievable in the present invention is about 10.0%, which becomes the substantial upper limit. ΔMR can be measured by the method described in the examples.

[0021] Also, it is important that the moisture absorption rate of Fiber A at a temperature of 20°C and a relative humidity of 65% is 2.0% or less. The moisture absorption rate at a temperature of 20°C and a relative humidity of 65% represents the strength of the interaction between Fiber A and water. The higher this moisture absorption rate, the higher the ability of the fiber to hold water. Even if the ΔMR of Fiber A is 2.0% or more, if the moisture absorption rate at a temperature of 20°C and a relative humidity of 65% is greater than 2.0%, the adsorption of sweat onto the fiber surface (hereinafter referred to as "water absorption") for liquid sweat is promoted, making it difficult to dry and likely to leave sweat on the knitted fabric. Therefore, for example, when moving from the outdoors to indoors in summer, when moving from a high-temperature environment to a low-temperature environment, the sweat remaining on the knitted fabric cools down, causing cold sweat. On the other hand, if the moisture absorption rate of Fiber A at a temperature of 20°C and a relative humidity of 65% is 2.0% or less, while having high moisture absorption performance, the interaction with water can be reduced. Therefore, even if liquid sweat is generated during sweating, water absorption by Fiber A is reduced, making it difficult for water to be retained in the knitted fabric, and it becomes possible to suppress stickiness and cold sweat when the environmental temperature drops. The moisture absorption rate of Fiber A at a temperature of 20°C and a relative humidity of 65% is preferably 1.6% or less. By further reducing the interaction with water, the heat of adsorption generated when absorbing water can also be reduced, and the stuffy feeling can be further suppressed. The moisture absorption rate of Fiber A at a temperature of 20°C and a relative humidity of 65% is more preferably 1.2% or less. The lower the moisture absorption rate of Fiber A at a temperature of 20°C and a relative humidity of 65%, the weaker the interaction with water, so the lower limit is 0%.

[0022] In fiber A, from the viewpoint of setting the moisture absorption and desorption parameter ΔMR to 2.0% or more and the moisture absorption rate at a temperature of 20°C and a relative humidity of 65% to 2.0% or less, as fiber A, specific polyester fibers, polyolefin fibers, acrylic fibers, etc. described below are preferable examples. The exemplified polyesters, polyolefins, and acrylics generally do not have functional groups that form strong interactions with water molecules in their molecular structures, so the moisture desorption rate of the fiber when it absorbs moisture increases. The faster the moisture desorption rate of the fiber, the more the fiber can perform the next moisture absorption and the more moisture absorption and desorption can be repeated. Therefore, the effect of suppressing the stuffy feeling is enhanced, and the wearing comfort of the clothes made of the knitted fabric of the present invention is improved, which is preferable.

[0023] Suitable polyesters constituting fiber A include aromatic polyesters typified by polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate (PBT), etc., and aliphatic polyesters typified by polylactic acid. Also, suitable polyolefins constituting fiber A include those having a branched structure typified by polyethylene and polypropylene. Further, a suitable acrylic constituting fiber A includes polyacrylonitrile. The composition of fiber A is not limited to those exemplified, but among these, generally, from the viewpoints of mechanical properties, heat resistance, and handleability during production, it is preferable to use aromatic polyesters.

[0024] The above aromatic polyester is a high molecular weight polymer having repeating units linked via ester bonds in the main chain composed of a combination of aromatic dicarboxylic acids and aliphatic diols, aliphatic dicarboxylic acids and aromatic diols, or aromatic dicarboxylic acids and aromatic diols. Preferably, it is an aromatic polyester composed of an aromatic dicarboxylic acid and an aliphatic diol. Examples of such aromatic dicarboxylic acids include, but are not limited to, terephthalic acid, isophthalic acid, 5-sulfoisophthalic acid, 2,6-naphthalenedicarboxylic acid, etc. Examples of such aliphatic diols include, but are not limited to, ethylene glycol, 1,3-propanediol, 1,4-butanediol, cyclohexanediol, diethylene glycol, etc.

[0025] When an aromatic polyester is used as the main component of Fiber A, since the fiber has high rigidity as a characteristic, deformation of the fiber due to moisture absorption and desorption is less likely to occur, and high dimensional stability in the woven fabric can be obtained. Also, in the clothing made of the woven fabric of the present invention, a texture with stiffness and firmness can be obtained.

[0026] As described above, since the polyester, polyolefin, and acrylic exemplified as the preferred Fiber A generally do not have functional groups that form strong interactions with water molecules in their molecular structures, examples of methods for making the ΔMR of Fiber A fall within the above range include adding a hygroscopic compound, disposing a polymer having high hygroscopicity (hereinafter sometimes referred to as a hygroscopic polymer) in the fiber, treating the polymer molecules on the fiber surface with ozone, etc. to generate hygroscopic functional groups. Among these, assuming that an excellent hygroscopic Fiber A is to be obtained, it is preferable to dispose a hygroscopic polymer in the fiber.

[0027] Examples of suitable hygroscopic polymers used for Fiber A include polyether esters, polyether amides, polyether ester amides, polyamides, thermoplastic cellulose derivatives, polyvinyl pyrrolidone, and the like. Among these, polyether esters, polyether amides, and polyether ester amides containing polyether as a copolymer component are excellent in stability during melt molding, have high target hygroscopicity, and are preferably used for Fiber A in the knitted fabric of the present invention. Further, when Fiber A in the knitted fabric of the present invention is a polyester fiber, particularly when it is made of an aromatic polyester, it has excellent affinity with the aromatic polyester, excellent heat resistance of the hygroscopic polymer, and effects such as good mechanical properties of the knitted fabric. Therefore, polyether ester is particularly preferably used in the present invention.

[0028] A polyether ester is a block copolymer having an ester bond and an ether bond in its polymer structure. Specifically, it is a block copolymer polymer obtained by polycondensation reaction of a polyester-forming component composed of a dicarboxylic acid and a diol and a polyalkylene glycol component. The combination of the polyester-forming component and the polyalkylene glycol component is not limited, but as a preferred example, from the viewpoint of the heat resistance of the hygroscopic polymer, a polyether ester obtained by copolymerizing polyethylene glycol with an aromatic polyester composed of an aromatic dicarboxylic acid and an aliphatic diol as the polyester-forming component can be mentioned. More preferably, it is a polyether ester composed of polybutylene terephthalate having excellent crystallinity and polyethylene glycol because elution of the hygroscopic polymer into hot water can be suppressed.

[0029] When disposing the hygroscopic polymer in Fiber A within the fiber, it is preferable to use a composite fiber composed of at least two types of polymers. The composite form in the fiber cross-section of Fiber A in the knitted fabric of the present invention is not particularly limited. However, from the viewpoints of suppressing the heat resistance of the hygroscopic polymer and the elution of the hygroscopic polymer into hot water, it is preferable to use a core-sheath composite fiber having the hygroscopic polymer as the core component or an island-in-sea composite fiber having the hygroscopic polymer as the island component. When Fiber A is a polyester-based fiber, it is preferable that the sheath component or the sea component is an aromatic polyester. By using a fiber having such a composite form, the hygroscopic polymer is not exposed on the fiber surface, so that it is possible to suppress the hygroscopic polymer from coming into contact with hot water and eluting outside the fiber, and the hygroscopicity does not change in the clothing made of the knitted fabric of the present invention. Further, since the surface of Fiber A is an aromatic polyester, the moisture release rate of the knitted fabric is increased, stickiness and cold sweats can be suppressed, and the clothing can provide stable wearing comfort.

[0030] In the case where the composite form of fiber A in the fiber cross section is a sea-island composite fiber with a hygroscopic polymer as an island component, the ratio L / R of the radius L of the circumscribing circle including all the islands arranged in the outermost periphery to the fiber radius R is preferably 0.5 to 0.7. Here, the island arranged in the outermost periphery in the fiber cross section means the island having the point closest to the fiber surface. The circumscribing circle including all the islands arranged in the outermost periphery in the fiber cross section is the circumscribing circle 3 in FIG. 1, and the radius L is the radius of the circumscribing circle 3. FIG. 1(b) shows an example in which the island is eccentric from the center of the fiber cross section, and the island arranged in the outermost periphery in the fiber cross section is 2d. In this case, the circumscribing circle including the island 2d arranged in the outermost periphery in the fiber cross section means a circle drawn so as to be in contact with the island (island 2e, 2f in FIG. 1(b)) that is closest to the fiber surface but not arranged in the outermost periphery in the fiber cross section as much as possible. When the L / R of fiber A, which is a sea-island composite fiber, is 0.5 or more, the island portions are close to the outer surface of the fiber, so that water permeation is less likely to be hindered by the thickness of the sea portion, and the fiber quickly absorbs gaseous sweat when it is generated, thereby suppressing stuffiness. In addition, when the hygroscopic polymer in the island portions absorbs moisture, heat of water adsorption is generated, and if the temperature of the sea portion increases due to this generated heat, stuffiness may be felt. On the other hand, when the L / R of fiber A, which is a sea-island composite fiber, is 0.7 or less, the increase in temperature of the sea portion due to the heat of absorption and / or heat of adsorption generated when the hygroscopic polymer in the island portions absorbs moisture is suppressed, which is preferable.

[0031] When the composite form in the fiber cross-section of Fiber A is a sea-island composite fiber with a hygroscopic polymer as the island component, it is preferable that the ratio I / C of the area I of the island part to the area C of the circumscribed circle including all the island parts arranged on the outermost periphery is 0.5 or more and 0.9 or less. Here, the circumscribed circle including all the island parts arranged on the outermost periphery in the fiber cross-section is the circumscribed circle 3 in FIG. 1, and the area C is the area of the circumscribed circle 3. If I / C in the fiber cross-section of the sea-island composite fiber that is Fiber A is 0.5 or more, since the distance between the island parts is not too far apart, the plurality of island parts function as a pseudo single island, and when the fiber absorbs moisture, anisotropy does not occur, and the moisture absorption amount corresponds to the ratio of the island parts. On the other hand, if I / C in the fiber cross-section of Fiber A is 0.9 or less, since moisture can be absorbed on all the surfaces of each island part, the moisture absorption speed is improved, and the stuffy feeling can be suppressed.

[0032] When the composite form in the fiber cross-section of Fiber A is a sea-island composite fiber with a hygroscopic polymer as the island component, the composite ratio of the sea component to the island component is preferably 50:50 to 90:10 in terms of the area ratio in the fiber cross-section. If the composite ratio of the sea component is 50% or more, the rigidity of the fiber increases as a characteristic, so deformation of the fiber due to moisture absorption and desorption is less likely to occur, and dimensional stability of the knitted fabric can be obtained. On the other hand, if the composite ratio of the sea component is 90% or less, that is, the composite ratio of the island component is 10% or more, Fiber A having excellent hygroscopicity is obtained.

[0033] When the composite form in the fiber cross-section of Fiber A is a sea-island composite fiber with a hygroscopic polymer as the island component, the number of island parts is not limited, but the larger the number of island parts, the larger the total surface area of the island parts, and the more opportunities there are for the hygroscopic polymer to contact water molecules, improving the moisture absorption speed. On the other hand, if the number of island parts increases and the number of island parts arranged in the central part of the fiber cross-section increases, it will take time for the island parts arranged in the central part of the fiber cross-section to absorb and desorb moisture, and the moisture absorption and desorption performance may decrease with respect to the composite ratio of the island component. From this perspective, it is preferable that the number of island parts is 3 or more and 9 or less.

[0034] The knitted fabric of the present invention preferably further contains a fiber (hereinafter referred to as fiber B) having a moisture absorption and desorption parameter ΔMR of less than 2.0%.

[0035] When the knitted fabric is composed of fiber A and fiber B, due to the high moisture absorption and desorption performance of fiber A, the knitted fabric absorbs moisture when sweating and releases moisture to the outside of the clothes, and the effect of further suppressing the stuffy feeling inside the clothes can be obtained. Fiber B with weak interaction with water can shorten the drying time of sweat, and can preferably suppress the sticky feeling and cold sweat. From this perspective, it is more preferable that the ΔMR of fiber B is less than 1.5%. Even in the hot and humid season with a lot of sweating such as midsummer, the drying time is short, so it is even more preferable that it is less than 1.0%.

[0036] As fiber B suitable for achieving the object of the present invention, any material such as synthetic fiber, semi-synthetic fiber, natural fiber, etc. may be used. For example, polyester-based fibers, polyolefin-based fibers, polyurethane-based fibers, etc. can be mentioned. Among these, when fiber A is a polyester-based fiber, from the viewpoints of affinity with fiber A, handleability and dyeability when manufacturing the knitted fabric, it is preferable that fiber B is a polyester-based fiber. More preferably, it is an aromatic polyester composed of an aromatic dicarboxylic acid and an aliphatic diol.

[0037] On the surface of the knitted fabric of the present invention opposite to the surface where the area occupancy rate of the fiber A is 50% or more, it is preferable that the area occupancy rate of the fiber B is 50% or more. By setting it within such a range, it becomes possible to further suppress the sticky feeling and cold sweat caused by the liquid sweat generated when sweating, and the wearing comfort of the clothes made of the knitted fabric of the present invention is improved. From this perspective, the higher the area occupancy rate of fiber B, the shorter the drying time of the knitted fabric. Therefore, a more preferable range in the present invention is 75% or more. Assuming a hot and humid season with a lot of sweating such as midsummer, a more preferable range is 90% or more.

[0038] The form of the fiber used in the knitted fabric of the present invention may be any form such as long fiber (filament), short fiber (staple), etc. In the case of long fiber, it may be a monofilament composed of a single fiber or a multifilament composed of a plurality of single fibers. In the case of short fiber, the cut length and the number of crimps are not limited. Also, yarn processing such as false twisting or twisting may be applied.

[0039] There is no limitation on the total fineness of the fiber when it is in the filament form used in the knitted fabric of the present invention, but it is preferably selected appropriately according to the use and required characteristics. From the viewpoint of improving the comfort which is the object of the present invention, it is preferable that the total fineness of the fiber used is 150 dtex or less. By setting it within such a range, the flexibility of the clothing made of the knitted fabric of the present invention is not impaired, and a comfortable wearing feeling can be obtained. Also, when the total fineness is decreased, generally a more supple knitted fabric is obtained, and in the present invention, it is assumed to be utilized as a clothing closer to the skin surface. Therefore, the total fineness of the fiber used in the knitted fabric of the present invention is more preferably 100 dtex or less, and even more preferably 75 dtex or less. The lower limit of the total fineness of the fiber used in the knitted fabric of the present invention is not limited, but is about 4 dtex.

[0040] The fibers used in the knitted fabric of the present invention are not limited in denier per filament, but it is preferable to appropriately select them according to the use and required characteristics. The denier per filament referred to here indicates a value obtained by dividing the total denier of the fibers used in the knitted fabric by the number of monofilaments constituting the fibers. When the fiber used in the knitted fabric of the present invention is a monofilament composed of a single fiber, the total denier and the denier per filament are the same value. In view of the object of the present invention, the denier per filament of the fiber to be used is preferably 5.0 dtex or less. By setting it within such a range, the flexibility of the clothing made of the knitted fabric of the present invention is not impaired, and a comfortable wearing feeling can be obtained. Generally, when the denier per filament is reduced, the rigidity of the fiber decreases. Therefore, in the clothing made of the knitted fabric of the present invention, the skin touch is good and the comfort is further improved. From this viewpoint, the denier per filament of the fiber used in the knitted fabric is more preferably 2.5 dtex or less. Further, reducing the denier per filament in fibers having the same total denier means that the number of monofilaments constituting the fibers increases, and fine voids are formed between the monofilaments, resulting in the adsorption, absorption, and diffusion of liquid sweat due to capillary action. Therefore, it is even more preferable to set it to 1.5 dtex or less. The lower limit of the denier per filament in the fibers used in the knitted fabric is preferably 0.2 dtex or more because the process passability and handleability during the production of the fibers, knitted fabric, and clothing are good, and there is less generation of lint during use, resulting in a knitted fabric with excellent durability.

[0041] The knitted fabric of the present invention has a ratio d of the denier per filament (d A ) of fiber A to the denier per filament (d B ) of fiber B B / d A which is preferably 0.01 or more and less than 1.0. The ratio of denier per filament d B / d ALess than 1.0 indicates that the fineness of single fiber of fiber B is finer than that of fiber A. If the fineness of single fiber of fiber B with lower hygroscopicity is finer than that of fiber A with strong interaction with water, the sweat adsorbed and absorbed by fiber A can be diffused by the capillary action in fiber B and is easily discharged from the knitted fabric. In particular, when the surface where fiber A is arranged with an area occupancy rate of 50% or more is the skin side of the knitted fabric and the surface where fiber B is arranged with an area occupancy rate of 50% or more is the surface of the knitted fabric, the sweat generated inside the clothes is adsorbed and absorbed by fiber A on the skin side of the knitted fabric, and is easily diffused outside the clothes by the capillary action of fiber B on the surface of the knitted fabric, the drying time is shortened, and the sticky feeling can be further reduced. From the viewpoint of promoting the capillary action of fiber B, it is more preferably 0.75 or less, and further preferably 0.67 or less. The smaller the single fiber fineness ratio d B / d A is, the more it can promote the capillary action, but the level that can be achieved by this technology is 0.01, which substantially serves as the lower limit. The single fiber fineness ratio d B / d A can be obtained by identifying the fibers constituting the knitted fabric by the method described in JIS L1030-1:2012 "Test method for mixing ratio of textile products - Part 1: Fiber identification", distinguishing fiber A and fiber B by measuring the ΔMR of each fiber, and calculating the fineness of each single fiber.

[0042] The strength of the fiber used in the knitted fabric of the present invention is not particularly limited, but from the viewpoint of processability when producing the knitted fabric, it is preferably 1.5 cN / dtex or more. The breaking elongation of the fiber used in the knitted fabric of the present invention may be appropriately set according to the application, but from the viewpoint of processability when producing the knitted fabric, it is preferably 25% or more and 60% or less.

[0043] The cross-sectional shape of the fiber used in the knitted fabric of the present invention can adopt not only a round cross-section, but also various cross-sectional shapes such as flat, Y-shaped, T-shaped, hollow-shaped, field-shaped, and well-shaped.

[0044] The air permeability of the knitted fabric of the present invention by the fragile method (JIS L1096:2010 "Test method for fabric of woven and knitted fabrics") is 10 cm 3 / (cm2 ·s) above 250 cm 3 / (cm 2 ·s) is preferably below. By setting it within such a range, the fabric has excellent sweat evaporation properties and can further reduce the stuffy feeling and stickiness during sweating. From the perspective of comfort, which is the object of the present invention, the higher the air permeability, the better the air permeability and the stuffy feeling can be reduced. Therefore, 50 cm 3 / (cm 2 ·s) or more is more preferable, and even more preferably 100 cm 3 / (cm 2 ·s) or more. Also, although there is no upper limit to the air permeability, in order to obtain good mechanical properties of the knitted fabric, improve the process passing property and handleability during the production of the knitted fabric and clothing, and make the clothing have no discomfort during wearing and excellent durability, it is preferably 250 cm 3 / (cm 2 ·s) or less.

[0045] The areal density of the knitted fabric of the present invention is preferably 250 g / m 2 or less. By setting the areal density to 250 g / m 2 or less, the knitted fabric does not become too thick, and the air permeability by the above-mentioned fragile method can be achieved. Also, since the knitted fabric is soft, when made into clothing, the knitted fabric is more likely to move, so the air inside the clothing is more likely to flow, and the function of adjusting the temperature and humidity inside the clothing, which is the object of the present invention, can be enhanced. The areal density of the knitted fabric is more preferably 200 g / m 2 or less, and even more preferably 150 g / m 2 or less. There is no limitation on the lower limit of the areal density, but in order to improve the handleability, wearability and durability of the knitted fabric, it is preferably 50 g / m 2 or more.

[0046] The knitted fabric of the present invention may contain a third fiber material other than fiber A and fiber B within a range not departing from the object of the present invention. When manufacturing the knitted fabric of the present invention, fiber A and / or fiber B and the third fiber material may be aligned and used, or may be used as a composite yarn by performing pre-mixed fiber processing or the like, and is not limited thereto.

[0047] <Clothing> When the knitted fabric of the present invention is made into clothing, there is no particular limitation on the form, and it may be either an upper garment or a lower garment. The upper garment may be either long-sleeved or short-sleeved, and the lower garment may be either long-skirted or short-skirted. Specific examples of the upper garment in the present invention include undergarments such as inner shirts, general clothing such as T-shirts, polo shirts, cut-sleeves, blouses, etc., and sports clothing such as sports inner shirts, etc., but are not limited thereto. Also, specific examples of the lower garment in the present invention include undergarments such as inner pants, general clothing such as slacks, pants, skirts, etc., and sports clothing such as sports pants, etc., but are not limited thereto.

[0048] The clothing made of the knitted fabric of the present invention is not limited to the surface where the area occupancy rate of the fiber A is 50% or more, but it is preferable that the surface where the area occupancy rate of the fiber A is 50% or more is the clothing skin surface. When the surface where the area occupancy rate of the fiber A is 50% or more is the clothing skin surface, the gaseous sweat generated inside the clothing is more likely to physically contact the fiber A, so the moisture absorption effect inside the clothing by the fiber A and the moisture release effect to the outside of the clothing are enhanced, and the feeling of stuffiness during sweating is further suppressed. The higher the amount of fiber A arranged on the clothing skin surface, the higher the moisture release effect, so the upper limit of the area occupancy rate is 100%.

[0049] In the clothing made of the knitted fabric of the present invention, when the surface where the area occupancy rate of the fiber A is 50% or more is the clothing skin surface, it is preferable that the surface where the fiber B is arranged with an area occupancy rate of 50% or more is the clothing surface. At this time, the clothing surface is the surface that contacts the external environment outside the clothing. If the surface where the fiber B is arranged with an area occupancy rate of 50% or more is the clothing surface, when the knitted fabric absorbs the liquid sweat generated inside the clothing, the fiber B discharges the liquid sweat to the external environment outside the clothing, shortening the drying time and suppressing the sticky feeling more effectively. Also, since water is less likely to remain on the clothing, it is also possible to further suppress the feeling of cold sweat. Furthermore, when the surface where the fiber B is arranged with an area occupancy rate of 50% or more is the clothing surface, when the temperature and humidity of the external environment are higher and / or more humid than the internal environment of the clothing, moisture absorption from the external environment outside the clothing and moisture release into the clothing can be reduced, and an increase in the humidity inside the clothing can be suppressed.

[0050] <Method for manufacturing knitted fabric> The knitted fabric of the present invention is a two-layer knitted structure having different structures on both sides of the knitted fabric. The structure is not limited, but it can be manufactured using an ordinary knitting machine such as a single circular knitting machine. The gauge number of the knitting machine used and the size of the knitting cylinder may be selected according to the areal density and air permeability of the knitted fabric to be manufactured. Further, as a method of supplying fiber A, fiber B, and other fibers to the knitting machine, they may be supplied from separate yarn feeders or from the same yarn feeder. The stitch shape may be any of knit, tuck, and welt, and is not limited to any combination.

[0051] An example of manufacturing the knitted fabric of the present invention in a back-yarn bridge structure will be described using the model diagram of FIG. 2. In FIG. 2, one course is formed with the face yarn, and the back yarn forms knit stitches skipping three stitches each, and one course is formed in a welt state with three stitches between the knit stitches. Since the welt state portion forms a bridge structure between the knit stitches, it is called a back-yarn bridge structure. Here, the number of stitches in which the back yarn forms a welt state is not limited and can be arbitrarily set. The more the number of stitches in the welt state increases (skipping four stitches, skipping five stitches, etc.), the wider the space formed between the face yarn and the back yarn becomes, and the effect of absorbing liquid sweat is enhanced, which is preferable. However, in order to improve the durability of the knitted fabric to be manufactured, it is preferably eight stitches or less skipped.

[0052] When manufacturing the knitted fabric of the present invention in a back-yarn bridge structure, when using fiber A and fiber B, in view of the object of the present invention, it is preferable that fiber A is the back yarn and fiber B is the face yarn.

[0053] Further, an example of manufacturing the knitted fabric of the present invention in a reversible rib structure is shown in FIG. 3. In FIG. 3, the face yarn and the back yarn are aligned and one course is formed with knit stitches. At this time, the face yarn and the back yarn may be supplied from separate yarn feeders or from the same yarn feeder. In FIG. 3, the back yarn forms knit stitches with all the knitting needles, but tuck stitches may also be used.

[0054] When manufacturing the knitted fabric of the present invention using a reversible ribbed fabric, when using fiber A and fiber B, in view of the object of the present invention, it is preferable to use fiber A as the back yarn and fiber B as the face yarn.

Example

[0055] The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. Each characteristic value in the examples was measured using the following methods.

[0056] A. ΔMR Weigh about 1 - 2 g of a fiber sample or a knitted fabric sample prepared according to the method described in Clause 6 of JIS L0105:2020 "General Rules for Physical Testing Methods of Textile Products" into a weighing bottle, dry it at 110 °C for 2 hours, and then measure the mass, which was designated as w0. Next, after holding the dried fiber sample at a temperature of 20 °C and a relative humidity of 65% for 24 hours, measure the mass, which was designated as w 65% . Subsequently, adjust the temperature to 30 °C and the relative humidity to 90%, hold the fiber sample for 24 hours, and then measure the mass, which was designated as w 90% . MR1 = [(w 65% - w0) / w0] × 100 ··· (1) MR2 = [(w 90% - w0) / w0] × 100 ··· (2) ΔMR = MR2 - MR1 ··· (3) At this time, the values calculated by formulas (1) to (3) were designated as ΔMR.

[0057] B. Moisture Absorption Rate at a Temperature of 20 °C and a Relative Humidity of 65% Using w0 and w 65% measured by the method described in item A, MR1 calculated by formula (1) was used as the moisture absorption rate at a temperature of 20 °C and a relative humidity of 65%.

[0058] C. Total Fiber Fineness and Single Fiber Fineness In accordance with the method described in JIS L1096:2010 "Test Methods for Fabrics and Knitted Fabrics", the total fineness and the number of filaments of the fibers constituting the knitted fabric sample were measured. The single fiber fineness was obtained by dividing the measured total fineness by the number of filaments and rounding to the first decimal place.

[0059] D. Single fiber fineness ratio d B / d A Using the single fiber finenesses of fiber A and fiber B measured by the method described in item C, the value obtained by dividing the single fiber fineness of fiber B by the single fiber fineness of fiber A was rounded to the third decimal place.

[0060] E. Radius L of the circumscribed circle and its area C in fiber A The fiber sample prepared in accordance with the method described in item 6 of JIS L0105:2020 "General Rules for Physical Test Methods of Textile Products" was embedded in epoxy resin, and an image was taken at a magnification of 500 to 1000 times, which is a magnification at which 10 or more single fibers can be observed, with a scanning electron microscope (SEM) SU1510 manufactured by Hitachi High-Tech Corporation in the direction perpendicular to the fiber axis. By analyzing the obtained image using the software WinROOF manufactured by Mitani Shoko Co., Ltd., the radius of the circumscribed circle including all the island parts arranged on the outermost periphery in the fiber cross-section was measured to the third decimal place. The simple arithmetic mean of the results obtained for 10 randomly selected single fibers was calculated, and the value rounded to the third decimal place was taken as the radius L (μm) of the circumscribed circle. Also, using the calculated radius L (μm), the area of the circumscribed circle including all the island parts arranged on the outermost periphery was obtained by calculation, and the value rounded to the second decimal place was taken as the area C (μm 2 ) of the circumscribed circle.

[0061] F. Fiber radius R In the same manner as in item E, an image of the fiber cross-section was taken with a SEM, and the radius of a single fiber randomly extracted within each of the taken images was measured to the third decimal place in μm units. The simple arithmetic mean of the results obtained for 10 randomly extracted single fibers was determined, and the value obtained by rounding off the third decimal place was taken as the fiber radius R (μm). When the fiber cross-section perpendicular to the fiber axis was not a perfect circle, its area was measured and the value obtained by converting it to a circle was adopted.

[0062] G. Area I of the island part In the same manner as in item E, an image of the fiber cross-section was taken with a SEM, and the taken image was converted into a grayscale image. Further, by adjusting the contrast and / or threshold value, binarization processing was performed so that the sea part and the island part could be distinguished in the fiber cross-section of a randomly extracted single fiber, and the area of the island part was calculated. The simple arithmetic mean of the results obtained for 10 randomly extracted single fibers was determined, and the value obtained by rounding off the second decimal place was taken as the area I (μm 2 ) of the island part.

[0063] H. Area occupancy rate Regarding the dyed knitted fabrics obtained in the examples and comparative examples, using a digital microscope VHX-6000 manufactured by Keyence Corporation, the surface of the knitted fabric was photographed at magnifications from 100 times to 500 times. Next, using WinROOF manufactured by Mitani Shoko Co., Ltd., a computer software, the photographed image was converted into a grayscale image. Further, by adjusting the contrast and / or threshold value, multi-valued processing was performed so that each fiber constituting the knitted fabric could be distinguished, and the area occupancy rate of each fiber constituting the knitted fabric with respect to the entire area of the image was calculated by image analysis.

[0064] I. Areal density The mass of a knitted fabric sample cut into a 10 cm square was measured, and the value obtained by dividing it by the area of the knitted fabric (0.01 m 2 ) was rounded off to the first decimal place to calculate the areal density (g / m 2 ).

[0065] J. Air permeability In accordance with the method described in JIS L1096:2010 "Test Methods for Fabrics and Knitted Fabrics" 8.26.1 Air Permeability Method A (Frazee Method), the air permeability was measured at five randomly selected locations from the knitted fabric sample, and the simple arithmetic mean of the measurement results was obtained. The value obtained by rounding off the first decimal place was taken as the air permeability of the knitted fabric (cm 3 / (cm 2 ·s)).

[0066] K. Drying Time After holding the knitted fabric sample at a temperature of 20°C and a relative humidity of 65% for 24 hours, the mass was measured, and this mass was designated as w a . Next, 0.3 ml of water was dropped onto the center of the surface (front side) of the knitted fabric sample under the same environment, and the mass was measured. This mass was designated as w 0分 . The moment when water was dropped onto the sample was taken as 0 minutes, and the mass of the sample was measured at 5-minute intervals. This mass was designated as w n分 . Here, n minutes represents any arbitrary time at which the mass of the sample was measured, and represents the times at 5-minute intervals such as 5 minutes, 10 minutes, and 15 minutes. The moisture retention rate WR at an arbitrary time was calculated by Equation (4). WR = [(w 0分 - w n分 ) / (w 0分 - w a )] × 100 ··· (4) The time when the moisture retention rate WR calculated by Equation (4) fell below 30% was taken as the drying time.

[0067] L. Wear Evaluation (Sense of Clamminess) A knitted fabric sample produced by the method described in the examples was sewn to produce a sports shirt. Ten subjects were made to wear the produced sports shirt. Subsequently, they were moved to a room at a temperature of 25°C and a relative humidity of 60% assuming a cool indoor environment in summer, and were made to sit on a chair and stay quiet for 10 minutes. Next, they were moved to another room at a temperature of 30°C and a relative humidity of 90% assuming an outdoor environment in summer, and were made to sit on a chair and stay quiet. After 60 minutes had elapsed since sitting in the room assuming an outdoor environment in summer, regarding the situation inside the clothes, "feeling no stickiness at all" was rated 5 points, "feeling almost no stickiness" was rated 4 points, "feeling a slight stickiness" was rated 3 points, "feeling stickiness" was rated 2 points, and "feeling strong stickiness" was rated 1 point, and the average score of the scores given by each of the ten subjects was calculated. A passing grade was set at an average score of 3.0 points or more, and an excellent grade was set at 3.5 points or more.

[0068] M. Wear evaluation (stickiness) In the wear evaluation in item L, after 60 minutes had elapsed since sitting in a room at a temperature of 30°C and a relative humidity of 90% assuming an outdoor environment in summer, regarding the situation inside the clothes, "feeling no stickiness at all" was rated 5 points, "feeling almost no stickiness" was rated 4 points, "feeling a slight stickiness" was rated 3 points, "feeling stickiness" was rated 2 points, and "feeling strong stickiness" was rated 1 point, and the average score of the scores given by each of the ten subjects was calculated. A passing grade was set at an average score of 3.0 points or more, and an excellent grade was set at 3.5 points or more.

[0069] N. Wear evaluation (sweating and chills) In the wear evaluation in item L, after 1 hour had elapsed in a room at a temperature of 30°C and a relative humidity of 90% assuming an outdoor environment in summer, they were moved to a room at a temperature of 25°C and a relative humidity of 60% assuming a cool indoor environment in summer, and were made to sit on a chair and stay quiet. After 10 minutes had elapsed since sitting, regarding the situation inside the clothes, "feeling no chills at all" was rated 5 points, "feeling almost no chills" was rated 4 points, "feeling a slight chill" was rated 3 points, "feeling chills" was rated 2 points, and "feeling strong chills" was rated 1 point, and the average score of the scores given by each of the ten subjects was calculated. A passing grade was set at an average score of 3.0 points or more, and an excellent grade was set at 3.5 points or more.

[0070] (Example 1) As fiber A, a sea-island composite type polyester fiber of 84 dtex - 36 filaments with a sea-island composite form was produced, where polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol was used as the sea component, and polybutylene terephthalate copolymerized with 50 wt% of polyethylene glycol with a number average molecular weight of 8300 g / mol was used as the island component, the sea-island ratio was 80:20 in area ratio, the number of island parts arranged on the outermost periphery was 3 islands, and the total number of islands was 3 islands. Also, as fiber B, a false-twisted yarn of 84 dtex - 48 filaments of polyester fiber composed of polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol was produced.

[0071] Next, a knitted fabric of reversible gingham texture was produced using a 28G single circular knitting machine such that fiber A was on the back side of the knitted fabric and fiber B was on the front side of the knitted fabric. The produced knitted fabric was put into an aqueous solution containing 1 g / L of sodium carbonate and "Sunmor" (registered trademark) BK-80 manufactured by Nihon Kayaku Co., Ltd., and scouring treatment was carried out at 80°C for 20 minutes. After the treated knitted fabric was washed with water, it was dried in a hot air dryer at 60°C for 60 minutes and dry heat set at 160°C for 2 minutes. The knitted fabric after dry heat setting was put into a dyeing solution in which 1.0 wt% of Kayacryl Blue 2RL-ED manufactured by Nippon Kayaku Co., Ltd. was added as a cationic dye and the pH was adjusted to 4.0, and dyed under the conditions of a bath ratio of 1:100 (meaning that the mass of the dyeing solution was 100 times the mass of the knitted fabric), a dyeing temperature of 130°C, and a dyeing time of 60 minutes. The dyed knitted fabric was washed with running water for 30 minutes and dried in a hot air dryer at 60°C for 60 minutes. The dried knitted fabric was put into an aqueous solution containing 1 g / L of sodium carbonate and 1 g / L of Lacol PSK manufactured by Meisei Chemical Industry Co., Ltd., treated at a bath ratio of 1:100 and 60°C for 20 minutes, washed with running water for 30 minutes, and dried in a hot air dryer at 60°C for 60 minutes to obtain a dyed knitted fabric.

[0072] Using the obtained dyed knitted fabric, a sports shirt was sewn and a wearing evaluation was carried out. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0073] (Example 2) Using a 28G single circular knitting machine such that Fiber A is on the back side of the knitted fabric and Fiber B is on the front side of the knitted fabric, a knitted fabric with a special structure was produced in which Fiber A is arranged in a shape similar to Fiber B inside Fiber B and a bridge structure between double knits is formed. Except for this, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0074] (Example 3) In Example 1, except that Fiber B was used as the ground yarn and Fiber A was used as the inserted yarn, and a knitted fabric with an inlay rib structure was produced using a 28G single circular knitting machine, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0075] (Example 4) In Example 1, except that Fiber B was used as the ground yarn and Fiber A was used as the filling yarn, and a knitted fabric with a plating rib structure was produced using a 28G single circular knitting machine, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0076] (Example 5) In Example 1, except that Fiber B was arranged on the front guide bar and Fiber A was arranged on the back guide bar, and a knitted fabric with a half tricot structure was produced using a single warp knitting machine, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0077] (Example 6) In Example 1, except that the false-twisted yarn of the sea-island composite polyester fiber of 56 dtex - 36 filaments was used as Fiber A, and the false-twisted yarn of the polyester fiber of 56 dtex - 36 filaments was used as Fiber B to produce a knitted fabric with a special structure forming a bridge structure between double stitches, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0078] (Examples 7, 8) In Example 1, except that the feeding position of Fiber A was adjusted to change the area occupancy rate of Fiber A in the knitted fabric as shown in Table 1, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0079] (Example 9) A false-twisted yarn of a sea-island composite polyester fiber of 56 dtex - 36 filaments, where polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol is the sea part, and polybutylene terephthalate copolymerized with 50 wt% of polyethylene glycol with a number average molecular weight of 8300 g / mol is the island part, and the sea-island ratio is 70:30 in area ratio, is used as the sheath yarn, and a drawn yarn of a simple laminated side-by-side (PBT / PET-BM (bimetal)) type polyester fiber of 84 dtex - 48 filaments, where polyethylene terephthalate and polybutylene terephthalate are laminated in a weight ratio of 50:50, is used as the core yarn, and a mixed fiber yarn obtained by subjecting to a mixed fiber process is used as Fiber A. Except that Fiber B is a false-twisted yarn of a polyester fiber of 56 dtex - 36 filaments and a knitted fabric with a special structure forming a bridge structure between double stitches is produced, the production of the dyed knitted fabric and the sewing of the sports shirt are carried out in the same manner as in Example 2. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 1.

[0080] (Example 10) As fiber A, a false twisted yarn of a core-sheath composite polyester fiber of 56 dtex-36 filament was selected, in which polybutylene terephthalate was used as the sheath and polybutylene terephthalate copolymerized with 50% by weight of polyethylene glycol having a number average molecular weight of 8300 g / mol was used as the core, and the core-sheath ratio was 60:40 by area. As fiber B, a blended spun yarn of 65% polyester fiber and 35% cotton (T65 / C35) with a cotton count of 40S (148 dtex) was selected. Next, a reversible plain weave knitted fabric was produced using a 28G single circular knitting machine so that fiber A was the back side of the knitted fabric and fiber B was the front side of the knitted fabric. The produced knitted fabric was put into an aqueous solution containing 1 g / L sodium carbonate and Sunmol BK-80 manufactured by Nicca Chemical Co., Ltd., and treated at 80°C for 20 minutes. The treated knitted fabric was washed with water, dried in a hot air dryer at 60°C for 60 minutes, and dry-heat set at 160°C for 2 minutes. The dry-heat set knitted fabric was placed in a dyeing solution containing 1.3% by weight of Nippon Kayaku Kayalon Polyester Blue UT-YA as a disperse dye and adjusted to pH 5.0, and dyed under the conditions of a bath ratio of 1:100, a dyeing temperature of 130°C, and a dyeing time of 60 minutes. The dyed knitted fabric was washed with running water for 30 minutes and dried in a hot air dryer at 60°C for 60 minutes. The dried knitted fabric was placed in an aqueous solution containing 2g / L sodium hydroxide, 2g / L sodium dithionite, and 0.5g / L Grand Up US-20 manufactured by Meisei Chemical Industry Co., Ltd., treated with a bath ratio of 1:100 at 60°C for 20 minutes, washed with running water for 30 minutes, and dried in a hot air dryer at 60°C for 60 minutes to obtain a dyed knitted fabric. The dyed knitted fabric was used to sew a sports shirt, and a wearing evaluation was carried out. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 2.

[0081] Example 11 A dyed knitted fabric was produced and a sports shirt was sewn in the same manner as in Example 1, except that a drawn yarn of a polyamide fiber of 84 dtex-36 filament made of polycapramide (N6) was selected as fiber B. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 2.

[0082] Example 12 In Example 1, except that a 36G single circular knitting machine was used to produce a knitted fabric of reversible ribbed fabric, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 2.

[0083] (Example 13) In Example 2, except that Fiber B was a false-twisted yarn of 84 dtex - 72 filament polyester fiber, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 2. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 2.

[0084] (Examples 14, 15) In Example 1, except that the radius L and area C of the circumscribed circle including all the island parts arranged on the outermost periphery in the fiber cross-section were changed by adjusting the composite form of Fiber A, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The evaluation results of the knitted fabric and the wearing evaluation results are shown in Table 2.

[0085] (Comparative Example 1) Using a false-twisted yarn of 84 dtex - 36 filament polyester fiber composed of polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol, and a false-twisted yarn of 84 dtex - 48 filament polyester fiber composed of polyethylene terephthalate, and using Kayalon Polyester Blue UT-YA manufactured by Nippon Kayaku Co., Ltd. as a disperse dye, the production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1. The hygroscopicity of the knitted fabric was low, and a stuffy feeling was felt when moving from an indoor environment to an outdoor environment during the wearing evaluation of the sports shirt, and a comfortable feeling could not be obtained.

[0086] (Comparative Example 2) In Example 1, except that the feeding position of Fiber A was adjusted and the area occupancy rate of Fiber A in the knitted fabric was changed as shown in Table 3, the dyed knitted fabric was produced and the sports shirt was sewn in the same manner as in Example 1. The area occupancy rate of Fiber A on both sides of the knitted fabric was low, and when moving from an indoor environment to an outdoor environment in the wearing evaluation of the sports shirt, a stuffy feeling was felt and a comfortable feeling was not obtained.

[0087] (Comparative Example 3) Using only the false-twisted yarn of a sea-island composite polyester fiber of 84 dtex - 36 filaments, which was composed of polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol as the sea component, and polybutylene terephthalate copolymerized with 50 wt% of polyethylene glycol with a number average molecular weight of 8300 g / mol as the island component, and the sea-island ratio was compounded to be 80:20 in area ratio, except that a knitted fabric of plain stitch was produced using a 28G single circular knitting machine, the dyed knitted fabric was produced and the sports shirt was sewn in the same manner as in Example 1. Although the hygroscopicity of the knitted fabric was excellent, since the entire knitted fabric was composed of Fiber A, when moving from an indoor environment to an outdoor environment in the wearing evaluation of the sports shirt, a stuffy feeling was felt and a comfortable feeling was not obtained.

[0088] (Comparative Example 4) Using only the false-twisted yarn of a 66 dtex - 72 filament polyester fiber composed of polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number average molecular weight of 1000 g / mol, except that a knitted fabric of plain stitch was produced using a 28G single circular knitting machine, the dyed knitted fabric was produced and the sports shirt was sewn in the same manner as in Example 1. Since the ΔMR of the fiber was low and the hygroscopicity was poor, the stuffy feeling was strong in the wearing evaluation of the sports shirt and a comfortable feeling was not obtained.

[0089] (Comparative Example 5) A drawn yarn of polyamide fiber of 56 dtex - 36 filaments made of polycapramide, and a false - twisted yarn of polyester fiber of 84 dtex - 48 filaments made of polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5 - sulfoisophthalate and 1.0 wt% of polyethylene glycol with a number - average molecular weight of 1000 g / mol were used. A knitted fabric of reversible gingham pattern was produced using a 28G single - jersey knitting machine. The production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 1, except for the above. The moisture absorption rate of the fibers on the skin - side surface was high at a temperature of 20°C and a relative humidity of 65%. In the wearing evaluation of the sports shirt, when moving from the outdoor environment to the indoor environment, the feeling of cold sweat was strong, and a comfortable feeling was not obtained.

[0090] (Comparative Example 6) A cotton - spun yarn of cotton count 50S (118 dtex) and a false - twisted yarn of polyester fiber of 84 dtex - 48 filaments made of polyethylene terephthalate were used. A knitted fabric with a special structure forming a bridge structure between double - knit stitches was produced using a 28G single - jersey knitting machine. The production of the dyed knitted fabric and the sewing of the sports shirt were carried out in the same manner as in Example 10, except that the knitted fabric was dyed using Kayalon Polyester Blue UT - YA manufactured by Nippon Kayaku Co., Ltd. as a disperse dye and NOVACRON P - 3R manufactured by HUNTSMAN as a reactive dye. The moisture absorption rate of the fibers on the skin - side surface was high at a temperature of 20°C and a relative humidity of 65%. In the wearing evaluation of the sports shirt, in the outdoor environment, the feeling of stuffiness was strong due to the moisture absorption and heat generation of the cotton - spun yarn, and when moving from the outdoor environment to the indoor environment, the feeling of cold sweat was strong, and a comfortable feeling was not obtained.

[0091] [Table 1]

[0092] [Table 2]

[0093] [Table 3]

Industrial Applicability

[0094] The knitted fabric of the present invention has a two-layer structure. By arranging fibers with a moisture absorption and desorption parameter ΔMR of 2.0% or more on at least one side and a moisture absorption rate of 2.0% or less at a temperature of 20°C and a relative humidity of 65%, the humidity inside the clothes can be adjusted, it has quick-drying properties, can suppress the sticky feeling, and can exhibit the humidity control effect inside the clothes without being affected by the external environment. Therefore, it can be preferably used particularly in clothing applications.

Explanation of Signs

[0095] 1 Kaibe 2a, 2b, 2c, 2d, 2e, 2f Island parts 3 Circumscribed circle including all island parts arranged on the outermost periphery in the fiber cross-section 4 Surface yarn 5 Back yarn

Claims

1. A two-layer knitted fabric, in which on at least one side, the moisture absorption and release parameter ΔMR is 2.0% or more and the area occupancy rate of a fiber (fiber A) having a moisture absorption rate of 2.0% or less at a temperature of 20°C and a relative humidity of 65% is 50% or more.

2. The knitted fabric according to claim 1 , comprising a fiber (fiber B) having a moisture absorption / release parameter ΔMR of less than 2.0%.

3. The knitted fabric according to claim 2 , wherein the area occupancy of said fiber B is 50% or more on the surface opposite to the surface on which said fiber A has an area occupancy of 50% or more.

4. The single fiber fineness (d Ａ ) and the single fiber fineness (d Ｂ ) ratio d Ｂ / d Ａ The knitted fabric according to claim 2 or 3, wherein the n-th order number is 0.01 or more and less than 1.

0.

5. The air permeability according to the Frazier method (JIS L1096:2010 "Testing methods for woven and knitted fabrics") is 10 cm ３ / (cm ２ ・s) or more 250cm ３ / (cm ２ The knitted fabric according to claim 1 or 2, wherein the thickness is equal to or less than s.

6. 3. The knitted fabric according to claim 1 or 2, wherein the fiber A is a sea-island composite fiber, a hygroscopic polymer is disposed in island portions in a cross section of the sea-island composite fiber, and a ratio L / R of a radius L of a circumscribed circle including all the island portions arranged at the outermost periphery to a fiber radius R is 0.5 or more and 0.7 or less.

7. The knitted fabric according to claim 6, wherein in a cross section of the sea-island composite fiber, a ratio I / C of an area I of an island portion to an area C of a circumscribing circle including all the island portions arranged at the outermost periphery is 0.5 or more and 0.9 or less.

8. A garment made of the knitted fabric according to claim 1 or 2.

9. The garment according to claim 8, wherein the surface on which the fiber A occupies 50% or more of the surface area is the skin surface of the garment.

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