Knitted fabric including core-sheath spun yarn and gym uniform or t-shirt

Abstract

To provide a knitted fabric that has low moisture content after dehydration processing during washing and excellent drying property, and hardly causes snag.SOLUTION: Content of a substantially twist-free core-sheath spun yarn in a knitted fabric is 10 mass% or more and 100 mass% or less. The core-sheath spun yarn has a core part containing polyester fibers having 3.5 dtex or more and 15.0 dtex or less of single fiber fineness and a sheath part containing polyester fibers.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a knitted fabric including a sheath-core yarn, and to a gym suit or a T-shirt. [Background technology]

[0002] Fabrics used in clothing are sometimes required to have the ability to absorb sweat and moisture and evaporate it quickly, i.e., moisture-absorbing and quick-drying properties. For example, Patent Document 1 discloses, as a yarn for a fabric having moisture-absorbing and quick-drying properties, an air-entangled spun yarn that includes a highly irregular polyester fiber having a titanium oxide content of less than 1.0 mass% and three or more protrusions present on the fiber circumference in a continuous fiber length direction, and a degree of irregularity of the fiber cross section (ratio of the circumscribed circle to the inscribed circle) of 1.8 or more, and / or a hollow polyester fiber having a hollow ratio of 8% or more, the polyester fiber having a fineness of 3.5 dtex or less, and the number of fluffs per 10 m of the spun yarn is 30 or more and less than 350 for lengths of 1 mm or more and less than 15 for lengths of 3 mm or more. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-220478 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors' study has revealed that although the fabric made of the air-entangled spun yarn of Patent Document 1 can exhibit water absorption and quick drying properties, it is difficult to reduce the moisture content after the dehydration process of washing. Furthermore, the inventors' study has revealed that in conventional water absorption and quick drying fabrics, snagging, a phenomenon in which fibers or yarns protrude from the surface of the fabric, may occur. The present invention has been made in view of the above circumstances, and its object is to provide a knitted fabric that has a low moisture content after the dehydration process of washing, has excellent drying properties, and is less likely to cause snagging. Yet another object is to provide a gym suit or T-shirt that has a low moisture content after the dehydration process of washing, has excellent drying properties, and is less likely to cause snagging. [Means for solving the problem]

[0005] The knitted fabric according to the embodiment is as follows [1]. [1] The yarn contains substantially untwisted core-sheath spun yarn in an amount of 10% by mass or more and 100% by mass or less, The core-sheath spun yarn is a knitted fabric having a core portion containing polyester fibers having a single fiber fineness of 3.5 dtex or more and 15.0 dtex or less, and a sheath portion containing polyester fibers.

[0006] By including a predetermined amount of the core-sheath spun yarn having the above-mentioned configuration, the knitted fabric has a low moisture content after the dehydration process of washing, which improves dryability after dehydration and makes snags less likely to occur. Also, clothing including the knitted fabric has a low moisture content after the dehydration process of washing, which improves dryability after dehydration and makes snags less likely to occur.

[0007] Furthermore, the knitted fabric according to the embodiment is preferably any one of the following [2] to [8]. [2] The knitted fabric according to [1], wherein the polyester fibers contained in the sheath portion are polyester staple fibers, and the polyester fibers contained in the core portion are polyester long fibers. [3] The knitted fabric according to [2], wherein the single fiber fineness of the polyester staple fiber contained in the sheath portion is smaller than the single fiber fineness of the polyester filament fiber in the core portion. [4] The knitted fabric according to [2] or [3], wherein the polyester staple fiber contained in the sheath portion has a single fiber fineness of 0.8 dtex or more and 3.5 dtex or less. [5] The knitted fabric according to any one of [2] to [4], wherein the polyester staple fiber of the sheath portion has one end closer to the core portion and the other end farther from the core portion, and extends in the longitudinal direction of the sheath-core spun yarn while rotating around the core portion so as to move away from the core portion as it moves from the one end to the other end. [6] The knitted fabric according to any one of [2] to [5], wherein the polyester staple fibers contained in the sheath have a modified cross section with a degree of irregularity of 1.6 or more and 3.6 or less. [7] The knitted fabric according to any one of [1] to [6], further comprising a false twist textured yarn containing polyester fibers. [8] The moisture content after dehydration is 5% or more and 25% or less, and The knitted fabric according to any one of [1] to [7], which has a drying time after dehydration of 10 minutes or more and 35 minutes or less.

[0008] Furthermore, the gym clothes or T-shirt according to the embodiment are as follows [9]. [9] A gymnastics suit or T-shirt having the knitted fabric described in any one of [1] to [8]. Effect of the Invention

[0009] According to the present invention, the above-mentioned configuration can provide a knitted fabric that has a low moisture content after the dehydration process of washing, thereby improving the dryability after dehydration and is less likely to snag. Also, the above-mentioned configuration can provide a gym suit or T-shirt that has a low moisture content after the dehydration process of washing, thereby improving the dryability after dehydration and is less likely to snag. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of an example of an apparatus for producing a sheath-core spun yarn according to an embodiment. [Diagram 2]Fig. 2(a) shows a structure diagram of the smooth knit of Example 1. Fig. 2(b) shows a structure diagram of the mesh knit of Example 2. Fig. 2(c) shows a structure diagram of the mock lodi knit of Example 3. Fig. 2(d) shows a structure diagram of the kanoko knit of Example 4. Fig. 2(e) shows a structure diagram of the kanoko knit of Example 5. Fig. 2(f) shows a structure diagram of the half jersey knit of Example 6. Fig. 2(g) shows a structure diagram of the smooth knit of Example 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The knitted fabric according to the embodiment contains substantially untwisted sheath-core spun yarn in an amount of 10% by mass or more and 100% by mass or less, and the sheath-core spun yarn has a core portion containing polyester fiber having a single fiber fineness of 3.5 dtex or more and 15.0 dtex or less, and a sheath portion containing polyester fiber. By containing a predetermined amount of the sheath-core spun yarn of the above configuration, the moisture content of the knitted fabric after the spin-drying process of washing is reduced, improving the drying property after spin-drying and making it less likely to snag. Each configuration of the knitted fabric according to the embodiment will be described in detail below.

[0012] The knitted fabric includes a sheath-core spun yarn with substantially no twist. The term "sheath-core spun yarn with substantially no twist" refers to a sheath-core spun yarn with no detectable twist or with a twist of 4.0 turns / inch or less when the twist number of the sheath-core spun yarn is measured by the twist number A method of JIS L 1095:2010 9.15.1. The sheath-core spun yarn is substantially twist-free, which makes it easier to drain water during centrifugal spinning. The sheath-core spun yarn with substantially no twist can be formed using a spinning method that utilizes the action of air flow, unlike ring spinning, which is twisted and converged. Examples of such spinning methods include air spinning, swirling air spinning, and vortex air spinning. In particular, a spinning method using a Murata Vortex Spinner (MVS) manufactured by Murata Machinery Co., Ltd. is preferred.

[0013] The knitted fabric contains substantially untwisted sheath-core spun yarn in a content of 10% by mass or more and 100% by mass or less. When the content is 10% by mass or more, the effect of the sheath-core spun yarn is easily exhibited. The content is preferably 20% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more. On the other hand, the content may be less than 100% by mass. This allows a yarn having different properties from the substantially untwisted sheath-core spun yarn to be used in the knitted fabric, and different properties can be imparted to the knitted fabric. The content may be 90% by mass or less, or 80% by mass or less.

[0014] The core-sheath spun yarn has a core and a sheath. The core and sheath each contain polyester fibers. The polyester fibers constituting the core and the polyester fibers constituting the sheath facilitate centrifugal dehydration. The polyester fibers are preferably hydrophobic fibers that do not retain much moisture inside the fibers.

[0015] In the core and sheath, the polyester fiber preferably contains 80% by mass or more of polyester, more preferably 90% by mass or more, and even more preferably 95% by mass or more, based on 100% by mass of the polyester fiber, while the polyester content may be 100% by mass or less, less than 100% by mass, or 99% by mass or less.

[0016] In the core and sheath, the polyester fiber is preferably a polyethylene terephthalate fiber. The polyethylene terephthalate fiber is a fiber containing a polyester having an ethylene terephthalate unit. In 100 mol % of all the polyester structural units contained in the polyester fiber, the content of the ethylene terephthalate unit is preferably 80 mol % or more, more preferably 90 mol % or more. On the other hand, the content of the ethylene terephthalate unit may be 100 mol % or less, or may be less than 100 mol %. The ethylene terephthalate unit is preferably composed of a structural unit derived from terephthalic acid or a derivative thereof, and a structural unit derived from ethylene glycol or ethylene oxide, and more preferably composed of a structural unit derived from terephthalic acid and a structural unit derived from ethylene glycol.

[0017] The polyester contained in the polyester fiber may have other structural units other than ethylene terephthalate units. In 100 mol% of all structural units of the polyester, the content of other structural units is preferably 20 mol% or less, more preferably 10 mol% or less. The content of the other structural units may be more than 0 mol% or may be 1 mol% or more. Examples of other structural units include structural units derived from polyvalent carboxylic acids other than terephthalic acid and its derivatives, and structural units derived from polyhydric alcohols other than ethylene glycol and ethylene oxide. Specific examples of other structural units include structural units derived from isophthalic acid, adipic acid, sebacic acid, azelaic acid, naphthalic acid, p-oxybenzoic acid, 2,5-dimethylterephthalic acid, bis(p-carboxyphenoxy)ethane, 2,6-naphthalenedicarboxylic acid, 3,5-di(carbomethoxy)benzenesulfonate, or derivatives thereof, and structural units derived from diethylene glycol, propylene glycol, 1,4-butanediol, or 1,4-bis(hydroxymethyl)cyclohexane.

[0018] The polyester fiber may contain, as necessary, an antioxidant, a matting agent, a colorant, a dyeability improver, a flame retardancy improver, an antistatic agent, a micropore-forming agent, a cationic dye dyeable agent, a coloring inhibitor, a heat stabilizer, a fluorescent whitening agent, a moisture absorbent, inorganic fine particles, or a mixture thereof. The content of these additives is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, based on 100% by mass of the polyester fiber. On the other hand, the content of the additives may be more than 0% by mass or may be 1% by mass or more.

[0019] The monofilament fineness of the polyester fiber contained in the core is 3.5 dtex or more and 15.0 dtex or less. In the following, polyester fibers having a monofilament fineness of 3.5 dtex or more and 15.0 dtex or less may be referred to as thick polyester fibers. By having a monofilament fineness of 3.5 dtex or more, the moisture content of the knitted fabric after centrifugal dehydration can be reduced, the dryness after centrifugal dehydration can be improved, and the sticky feeling when worn immediately after dehydration can be reduced. Furthermore, the dryness after centrifugal dehydration can be improved. The reason why the water drainage during centrifugal dehydration is improved in this way is thought to be that the specific surface area of ​​thick polyester fibers of 3.5 dtex or more is small and the wetted area is small, so that the water is easily removed by the centrifugal force during dehydration. Furthermore, by containing thick polyester fibers in the core, snags, which are a phenomenon in which threads or fibers come out of the knitted fabric, are less likely to occur. On the other hand, by having a monofilament fineness of 15.0 dtex or less, the friction of the knitted fabric against the skin can be reduced. The single fiber fineness is preferably 5.0 dtex or more and 13.0 dtex or less, more preferably 6.0 dtex or more and 9.5 dtex or less. When the polyester fiber is a long fiber, the single fiber fineness dtex is dpf (dtex per filament).

[0020] The sheath-core spun yarn preferably contains thick polyester fibers in the core portion at a content of 10% by mass or more and 50% by mass or less. When the content is 10% by mass or more, it becomes easier to reduce the moisture content after centrifugal dehydration. The content is more preferably 20% by mass or more. On the other hand, when the content is 50% by mass or less, the sheath-core spun yarn can contain thin polyester fibers, and properties such as texture can be improved. The content is more preferably 40% by mass or less.

[0021] The thick polyester fiber contained in the core is preferably raw silk. Raw silk is a filament that has not been given shrinkage by heat treatment after spinning. Raw silk can reduce the gaps between fibers, so that the moisture content after centrifugal dehydration can be reduced. The raw silk may be twisted yarn or may be formed by air entanglement treatment. These treatments may converge the fibers to improve water drainage. The thick polyester fiber may be false twisted yarn, knitted or de-knitted crimped yarn, etc.

[0022] The total fineness of the thick polyester fibers contained in the core is preferably 20 dtex or more and 120 dtex or less, more preferably 30 dtex or more and 100 dtex or less, and even more preferably 35 dtex or more and 90 dtex or less. A total fineness of 20 dtex or more improves the strength of the knitted fabric and makes it easier to prevent the knitted fabric from being see-through. On the other hand, a total fineness of 120 dtex or less improves water drainage because water is less likely to remain between the fibers or in the yarn loops.

[0023] The polyester fibers contained in the core are preferably polyester long fibers. This improves water drainage during centrifugal dehydration. Here, long fibers and filaments refer to fibers that have a continuous length, such as silk. The core may contain polyester short fibers. In this case, the single fiber fineness of the polyester short fibers in the core is preferably larger than the single fiber fineness of the polyester short fibers in the sheath.

[0024] The cross-sectional shape of the polyester fiber contained in the core may be a circle, a polygon such as a triangle or a square, a Y-shape, a flat shape, or a combination of these, but a circle, a polygon, a flat shape, or a combination of these is preferred, and a circle is more preferred. This improves the drainage during centrifugal dehydration. The polygon may be a polygon with rounded corners. The polyester fiber contained in the core is preferably a solid fiber, but may also be a hollow fiber having a lumen extending in the longitudinal direction. The cross section is a cross section in the radial direction of the polyester fiber.

[0025] The single fiber fineness of the polyester staple fiber contained in the sheath is preferably 0.8 dtex or more and 3.5 dtex or less, more preferably 1.0 dtex or more and 3.0 dtex or less, and even more preferably 1.2 dtex or more and 2.5 dtex or less. By having a fineness of 3.5 dtex or less, the number of fibers constituting the sheath can be increased to improve entanglement, thereby improving the strength of the sheath, and the flexibility of the fiber can be improved, thereby improving the texture. On the other hand, by having a fineness of 1.0 dtex or more, the strength of the fiber can be improved.

[0026] The single fiber fineness of the polyester short fiber contained in the sheath is preferably smaller than that of the polyester long fiber contained in the core, which improves the water drainage of the core during centrifugal dehydration while improving the texture of the sheath.

[0027] The polyester fiber contained in the sheath preferably has an irregular cross section with a degree of irregularity of 1.6 or more and 3.6 or less. When the degree of irregularity is 1.6 or more, capillary phenomenon occurs easily, improving the water mobility between the fibers. The degree of irregularity is more preferably 2.0 or more, and even more preferably 2.4 or more. On the other hand, when the degree of irregularity is 3.6 or less, the water retention on the surface of the polyester fiber can be reduced. The degree of irregularity is more preferably 3.0 or less, and even more preferably 2.8 or less. The degree of irregularity is the ratio of the diameter of the circumscribing circle to the diameter of the inscribing circle of the polyester fiber in the radial cross section of the polyester fiber.

[0028] The cross-sectional shape of the polyester fiber contained in the sheath may be a polygon such as a circle, a triangle, or a rectangle, a Y-shape, a flat shape, or a combination of these, but a polygon, a Y-shape, or a combination of these is preferred, and a Y-shape is more preferred. This improves water absorption and quick drying properties. The polygon may be a polygon with rounded corners. The polyester fiber contained in the sheath is preferably a solid fiber, but may also be a hollow fiber having a lumen extending in the longitudinal direction. The above cross section is a cross section in the radial direction of the polyester fiber.

[0029] The polyester fibers contained in the sheath are preferably polyester staple fibers. This can reduce the number of fluffs and the degree of fluff entanglement, and can further improve the texture and yarn quality. The fiber length of the polyester staple fibers is preferably 60 mm or less, and more preferably 51 mm or less. On the other hand, the fiber length of the polyester staple fibers is preferably 32 mm or more, and more preferably 35 mm or more. This can improve the entanglement of the fibers.

[0030] The sheath-core spun yarn preferably contains 50% by mass or more and 90% by mass or less of thin polyester fibers in the sheath portion, the fiber size of which is 0.8 dtex or more and less than 3.5 dtex. A content of 50% by mass or more improves the texture of the knitted fabric. The content is more preferably 60% by mass or more. On the other hand, a content of 90% by mass or less allows the sheath-core spun yarn to contain thick polyester fibers, thereby reducing the moisture content after centrifugal dehydration. The content is more preferably 80% by mass or less.

[0031] The polyester fiber contained in the sheath is preferably a polyester staple fiber, and the polyester fiber contained in the core is preferably a polyester long fiber. In this way, the core-sheath spun yarn is preferably a long-short composite spun yarn containing a polyester long fiber in the core and a polyester short fiber in the sheath. This makes it easier to achieve the effects of the polyester long fiber and the polyester short fiber described above.

[0032] The polyester staple fibers in the sheath preferably have one end closer to the core and the other end farther from the core, and extend in the longitudinal direction of the sheath-core spun yarn while rotating around the core so as to move away from the core as they move from one end to the other. This configuration can improve the entanglement of the fibers in the sheath, thereby reducing the voids in the sheath and further reducing the number of fuzz. As a result, the moisture content after dehydration can be reduced. Such a sheath can be formed by a spinning method using, for example, a Murata Vortex Spinner (MVS) manufactured by Murata Machinery Co., Ltd.

[0033] The number of crimps of the polyester fiber contained in the sheath is preferably 8 / 25 mm or more and 20 / 25 mm or less, and more preferably 10 / 25 mm or more and 18 / 25 mm or less. By having the number of crimps of 8 / 25 mm or more, the entanglement of the fibers in the sheath can be improved, thereby improving the strength. On the other hand, by having the number of crimps of 20 / 25 mm or less, the gap between the fibers can be reduced, thereby reducing the moisture content after dehydration.

[0034] The number of fluffs of 1 mm or more in the sheath-core spun yarn is preferably 30 fluffs / 10 m or more. This reduces the degree of fiber entanglement, improving the texture. On the other hand, the number of fluffs of 1 mm or more in the sheath-core spun yarn is preferably 350 fluffs / 10 m or less, more preferably 300 fluffs / 10 m or less. By having the number of fluffs be 350 fluffs / 10 m or less, the pilling resistance can be improved. This also reduces the retention of water in the knit loops of the knitted fabric.

[0035] The number of fluffs of 3 mm or more in the sheath-core spun yarn is preferably 15 fluffs / 10 m or less, more preferably 10 fluffs / 10 m or less. By having it 15 fluffs / 10 m or less, the pill resistance can be improved. This also reduces the retention of water in the knit loops of the knitted fabric. For example, by forming the sheath-core spun yarn with high-speed air fluid, the number of fluffs can be reduced. The number of fluffs may be 1 fluff / 10 m or more.

[0036] As described above, the sheath-core spun yarn can be formed by a spinning method that utilizes the action of an air flow. A preferred example of a method for producing a sheath-core spun yarn containing a long fiber in the core portion will be described below.

[0037] As shown in Figure 1, in a preferred method for producing sheath-core spun yarn, a sliver L is transferred to a drafting device DR, drawn to a desired fineness, and then spun into a yarn by the swirling air of air spinning nozzles disposed in a spinning section SP. The spun yarn is sent through nip rollers NR to a winding section and wound into a package PW.

[0038] The draft device DR can draft the sliver L, which is supplied through a trumpet T, a guide through which the sliver L passes, to a predetermined fineness. The draft device DR preferably has a back roller BR, a third roller TR, a middle roller MR having an apron belt E, and a front roller FR, which are arranged at a predetermined interval in the sliver feed direction. The back roller BR, the third roller TR, the middle roller MR having an apron belt E, and the front roller FR each preferably have a pair of rollers facing each other. Each roller pair is preferably configured so that the feed speed gradually increases as the position of the roller pair becomes more downstream. In the roller draft section formed by these roller pairs, the sliver L is passed through the roller pairs, drafted to a predetermined fineness, and then sent to the spinning section SP.

[0039] The spinning unit SP is preferably equipped with a two-stage air spinning nozzle that generates a swirling flow and is capable of high-speed spinning. The spinning unit SP may be a spinning unit equipped with a one-stage spinning nozzle that generates a swirling flow and a spinning spindle, or may be a spinning unit equipped with a one-stage air spinning nozzle and a twisting member consisting of a pair of twisting rollers. At this time, it is preferable to introduce the filament corresponding to the core from the upstream side of the front roller FR to approximately the center of the sliver bundle that is being drafted and fed. The core filament is drawn out from the yarn supply package 11 and introduced via the feed roller 12 with a predetermined yarn tension applied. At this time, by introducing it to approximately the center of the sliver bundle that is being drafted and fed, a core-sheath spun yarn can be produced in which the filament core is the center and the periphery of the core is covered by the sheath of short fibers.

[0040] The spinning section SP uses air spinning nozzles to spin the staple fibers, so the filaments fed are not twisted. Therefore, the spun yarn that passes through the spinning section SP is a long-short composite spun yarn with a sheath-core structure in which the staple fibers cover the untwisted filaments.

[0041] The knitted fabric may have only sheath-core spun yarn as the yarn constituting the knitted fabric, but may also include yarn other than the sheath-core spun yarn. The following mainly describes an embodiment in which the knitted fabric includes sheath-core spun yarn and yarn other than the sheath-core spun yarn.

[0042] The knitted fabric preferably further includes a false twisted yarn containing polyester fiber. By interweaving the sheath-core spun yarn and the false twisted yarn, the touch, i.e., the texture, and pilling resistance of the knitted fabric can be improved. The false twisted yarn is preferably a polyester filament. On the other hand, the knitted fabric may be formed by interweaving the sheath-core spun yarn and raw silk of polyester filament.

[0043] The polyester fiber of the false twist textured yarn is preferably a polyester obtained by copolymerizing and / or mixing two or more compounds selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, stereocomplex polylactic acid, polylactic acid, and a third component. The third component is preferably a compound copolymerizable with at least one of the above compounds.

[0044] The crimp elongation rate of the false twisted yarn is preferably 20% or more and 60% or less. This allows the stretchability and kickback properties of the knitted fabric to be improved. The crimp recovery rate is more preferably 15% or more and 30% or less.

[0045] The crimp of false twist textured yarn can be imparted by false twist processing. For example, as a method of heat setting in false twist processing, there is a method of heat setting the false twist by heating only the first heater (single heater false twist) and a method of heat setting the false twist by heating both the first heater and the second heater (two heater false twist), and either method can be used.

[0046] The single fiber fineness of the false twist textured yarn is preferably 0.1 dtex or more and 5 dtex or less, and more preferably 0.5 dtex or more and 3.5 dtex or less. A single fiber fineness of 0.1 dtex or more improves kickback properties and elongation recovery. A single fiber fineness of 5 dtex or less improves hand.

[0047] The total fineness of the false twist textured yarn is preferably 10 dtex or more and 500 dtex or less, and more preferably 30 dtex or more and 220 dtex or less. The total fineness of 10 dtex or more can improve the stretch recovery of the knitted fabric. The total fineness of 500 dtex or less can make the knitted fabric thinner, improving the wearing comfort of the knitted fabric.

[0048] The cross-sectional shape of the fibers of the false twist textured yarn may be a circle, a polygon such as a triangle or a rectangle, a Y-shape, a flat shape, or a combination of these. The polygon may be a polygon with rounded corners. The fibers of the false twist textured yarn are preferably solid fibers, but may also be hollow fibers having a lumen extending in the longitudinal direction. The cross section is a cross section in the radial direction of the fiber.

[0049] The knitted fabric may contain yarns other than the sheath-core spun yarn and the false twist textured yarn. For example, the knitted fabric may contain a sheath-core spun yarn, a false twist textured yarn, and another yarn, or may contain a sheath-core spun yarn and another yarn. Examples of the other yarns include those obtained by subjecting long fibers to normal air processing, such as taslan processing or interlace processing, or twisting processing. The false twist textured yarn and the other yarn may each be a composite yarn independently, or a composite yarn may be formed by the false twist textured yarn and the other yarn. The knitted fabric may also contain fibers other than polyester fibers.

[0050] The knitted fabric may be a circular knitted fabric or a warp knitted fabric. The circular knitted fabric may be a single knitted fabric or a double knitted fabric. A single knitted fabric or a double knitted fabric with a low knitting density has excellent water drainage properties during dehydration. Examples of the circular knitted fabric include a plain knitted fabric, a milling knitted fabric, a smooth knitted fabric, a mesh knitted fabric, a mock roddy knitted fabric, a kanoko knitted fabric, and a half plain knitted fabric, but are not limited to the smooth knitted fabric, the mesh knitted fabric, the mock roddy knitted fabric, the kanoko knitted fabric, and the half plain knitted fabric. The warp knitted fabric may be, for example, a tricot knitted fabric or a raschel knitted fabric.

[0051] In the case of a circular knitted structure, the knitting density is preferably 25 pieces / inch or more and 65 pieces / inch or less for both the course and the wale, and more preferably 30 pieces / inch or more and 60 pieces / inch or less. In the case of a warp knitted structure, the knitting density is preferably 30 pieces / inch or more and 70 pieces / inch or less for both the course and the wale, and more preferably 40 pieces / inch or more and 65 pieces / inch or less. By having a knitting density equal to or more than the lower limit, the see-through of the knitted fabric can be reduced, and the loops are less likely to get caught, making it easier to prevent sink marks and snare, making the knitted fabric suitable for innerwear applications. On the other hand, by having a knitting density equal to or less than the upper limit, the moisture content after centrifugal dehydration can be reduced.

[0052] The knit fabric has a weight of 50g / m 2 More than 250g / m 2 It is preferable that the thickness is less than 70 g / m 2 More than 230g / m 2 More preferably, it is 75 g / m or less. 2 More than 220g / m 2 It is more preferable that the weight per unit area is 50 g / m or less. 2 By setting the yarn density to 250 g / m or more, the yarn fineness and density can be increased, and the shape retention of the knitted fabric can be improved. 2 By satisfying the above condition, the water drainage property is improved, and the water content after centrifugal dehydration can be reduced.

[0053] The knitted fabric may be subjected to a water-absorption treatment (hydrophilic treatment). Examples of water-absorption treatments include alkali weight reduction treatment for polyester, and treatments using hydrophilic finishing agents such as polyester-polyalkylene glycol copolymer resin (so-called water-absorbent polyester resin), cellulose, and hydrophilic silicone. Use of a polyester-based hydrophilic finishing agent can improve the durability of polyester fibers, so it is preferable to use a polyester-based hydrophilic finishing agent. Examples of the treatment method in the water-absorption treatment include a pad method, a spray method, and an exhaust method, and among these, the exhaust method is the most preferable because it is easy to penetrate the finishing agent into the inside of the knitted fabric.

[0054] The moisture content of the knitted fabric after dehydration is preferably 5% or more and 25% or less. By having a moisture content of 25% or less after dehydration, it is possible to reduce the sticky feeling and sticking to the skin when worn immediately after dehydration. Therefore, the moisture content after dehydration is more preferably 22% or less, and even more preferably 20% or less. On the other hand, by having a moisture content of 5% or more after dehydration, the knitted fabric can exhibit a certain degree of water absorption, improving the comfort when worn after drying. The moisture content after dehydration can be obtained by calculating the moisture content of the knitted fabric after centrifugal dehydration using a domestic electric washing machine equipped with a centrifugal dehydrator specified in JIS C9606 as in the examples described below, using the operating method described in JIS L0217, Method 103.

[0055] The drying time of the knitted fabric after dehydration is preferably 10 minutes or more and 35 minutes or less. By having a drying time of 35 minutes or less, the effort and cost required for drying can be reduced. Therefore, the drying time after dehydration is more preferably 30 minutes or less, and even more preferably 28 minutes or less. On the other hand, by having a drying time of 10 minutes or more, the knitted fabric can exhibit a certain degree of water absorption, improving comfort when worn after drying. The drying time after dehydration can be determined by calculating the time (minutes) from dehydration until the moisture content of the knitted fabric after dehydration reaches 10%, as in the examples described below.

[0056] The knitted fabric preferably has a pilling level of 3 or higher, more preferably 3.5 or higher. This improves the durability of the knitted fabric. On the other hand, the pilling level may be 5 or lower. The pilling level may be measured by the JIS L1076A method.

[0057] The knitted fabric is preferably used as a material for clothing. As described above, the moisture content of the knitted fabric is low after the dehydration process of washing, so that the drying property after dehydration is improved and snagging is unlikely to occur, and therefore clothing including the knitted fabric has a low moisture content after the dehydration process of washing, excellent drying property, and is unlikely to cause snagging. As clothing, T-shirts, gym clothes, and other work clothes used in schools are suitable. Furthermore, the knitted fabric is also suitable for use in sports clothing that causes a lot of sweating, travel clothing that does not have enough time to dry, knitwear, and the like. EXAMPLES

[0058] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the following examples, and can be modified within the scope of the above and below mentioned aims, and all such modifications are included in the technical scope of the present invention.

[0059] The measurement and evaluation of the characteristic values ​​of the knitted fabrics in the examples and comparative examples described later were carried out according to the following methods.

[0060] <Editing density> The course density (pieces / inch) and wale density (pieces / inch) of the knitted fabric were measured based on the provisions of JIS-L1018 (1998).

[0061] <Weight of knitted fabric> The weight of the knitted fabric was measured based on the provisions of JIS-L1096(2020) 8.3.2, Method A.

[0062] <Snug> The snag grade of the outer surface of the knitted fabric was determined based on the D-1 method of JIS L 1058 (2011) 7.3.

[0063] <Pilling> The pilling grade on the outer surface of the knitted fabric was determined based on JIS L1076 (2012) ICI A method (5 hours).

[0064] <Wear resistance> The abrasion resistance of the knitted fabric was determined based on JIS L1096 (2010) E method (Martindale type method).

[0065] <Texture> The texture was evaluated by 10 experts, and rated according to the following criteria using a two-level majority vote: good or bad. Specifically, if 5 out of 10 experts judged the texture to be good, the result was judged to be good. Good: Spun yarn-like texture with a pleasant feel Poor: The texture does not feel like spun yarn.

[0066] <Total size, number of filaments, single fiber size, yarn count> The total fineness of the long fibers was measured according to the JIS L1013 8.3.1, Correct Fineness Method A, and calculated as decitex (dtex). The number of filaments in the long fibers was measured according to the JIS-L1013 8.4. The single fiber fineness (dpf) of the long fibers was calculated by calculating the total fineness / number of filaments. The single fiber fineness of the staple fibers was measured according to JIS L1015 (2010) 8.5.1, Correct Fineness Method A. The count of the spun yarn (core-sheath composite yarn) was measured by measuring the apparent cotton count in English count according to the JIS L 1095 (2010) 9.4.2.

[0067] <Moisture content after dehydration and dryness after dehydration> The moisture content of the knitted fabric after centrifugal spin-drying was determined using a domestic electric washing machine equipped with a centrifugal spin-drying device as specified in JIS C9606, according to the operating method described in JIS L0217, Method 103. In detail, the knitted fabric was first cut into a size of 40 cm vertically and 50 cm horizontally, sewn into a cylindrical shape with polyester thread, and then completely dried to obtain a sample. The sample was left in an environment of 20°C temperature and 65% relative humidity for 24 hours, and its mass (g) was measured thereafter, and this was designated as W0 (g). Next, water with a liquid temperature of 40°C was added up to the water level line indicating the standard water volume in the water tank of the test device, and synthetic laundry detergent was added and dissolved in the standard amount to prepare the washing liquid. The sample and load cloth were placed in this washing liquid so that the liquor ratio was 1:30, and operation was started. As the load cloth, simulated laundry described in JIS C9606, Appendix 1 was used. After five minutes of processing, the operation was stopped, the sample and the load of fabric were dehydrated in the dehydrator, and the washing liquid was replaced with fresh water at 30°C or less and rinsed for two minutes. Next, the sample and the load of fabric were dehydrated, rinsed again for two minutes, and the mass (g) of the sample immediately after three minutes of dehydration (power supply time) was measured and this was designated as W1 (g). The values ​​of W0 (g) and W1 (g) of the sample were applied to the following formula to calculate the moisture content after dehydration. Water content after dehydration (%)=(W1-W0) / W0×100 After that, the sample was left in a room under standard conditions (20℃ and 65% RH) and the mass (Wx) was measured at regular intervals, and the time when the moisture content of the test piece reached 10% was measured and used as an index of the dryness after dehydration. The moisture content of the sample was calculated using the following formula. Moisture content (%)=(Wx-W0) / W0×100

[0068] Example 1 As the fiber of the sheath, polyethylene terephthalate staple fibers (single fiber fineness 1.0 dtex, fiber length 38 mm, crimp number 14 pieces / 25 mm) with a Y cross section and an irregularity of 2.4, in which titanium oxide with an average particle diameter of 0.4 μm was kneaded at 2.0 mass %, were used. On the other hand, as the fiber of the core, polyethylene terephthalate filaments (raw silk) with a round cross section of 33 dtex and 6 filaments in which titanium oxide was kneaded at 0.5 mass % were used. The polyethylene terephthalate staple fibers were mixed using a cotton blending machine manufactured by OHARA, and then carded into a sliver using a carding machine manufactured by Ishikawa Seisakusho, and passed through a drafting machine manufactured by Original Weaving Machine twice to obtain a sliver of 180 grains / 6 yd. Next, spinning was performed using a Murata Vortex Spinner (MVS) manufactured by Murata Machinery. At this time, polyethylene terephthalate filaments (core) were introduced from the upstream side of the front roller FR of the MVS to the approximate center of the sliver bundle to obtain a 40-count long-short composite core-sheath spun yarn. The spinning conditions were a nozzle pressure of 0.55 MPa and a spinning speed of 350 m / min.

[0069] The obtained sheath-core spun yarn was used to knit a circular knitting machine with a smooth structure as shown in Figure 2(a) on a 33 inch-22 gauge LEC (manufactured by Fukuhara Seiki Co., Ltd.). In Figure 2(a), reference numeral 1 indicates the yarn feeder in which the sheath-core spun yarn was arranged. The knitting conditions were a yarn length of 300 mm / 100 wales.

[0070] The obtained grey fabric was opened and then scoured and bleached using a Hisaka Seisakusho NS type liquid flow dyeing machine with the following recipe 1 under the conditions of a bath ratio of 1:10, a temperature of 95°C, and a time of 60 minutes, and then neutralized with acetic acid and washed with water. Formulation 1 Caustic soda (Nippon Soda) 0.5g / L Scouring agent (Sunmol WX, manufactured by Nicca Chemical Co., Ltd.) 1g / L Sodium tripolyphosphate (Tada Pharmaceutical Co., Ltd.) 0.5g / L

[0071] Next, using the following recipe 2, dispersion dyeing was carried out at a bath ratio of 1:15 at 130°C for 30 minutes, followed by soaping twice, washing with hot water, neutralization, rinsing with water, and further hydrophilic processing in the dyeing machine. Formulation 2: pH adjuster (acetic acid 0.2g / L pH=4) Leveling agent (Meisei Chemical Industry Co., Ltd. Disper TL) 1g / l Dispersed dye (CIDisprese Blue 165) 1.0%owf Hydrophilic processing agent (Takamatsu Oil SR1801M) 1.5% owf

[0072] Next, after centrifugal dehydration and continuous drying, the fabric was finished by padding with the following recipe 3. The wet pick-up rate was 100% in this treatment. The fabric was then final set at 160°C for 1 minute to adjust the strength. Formulation 3 Sewing improver (Sunmariner 713, manufactured by Nicca Chemical Co., Ltd.) 5g / L Antistatic agent (Datelon N, manufactured by Nicca Chemical Co., Ltd.) 3g / L

[0073] The weight of the knitted fabric thus obtained is 205 g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 43 courses / inch and 36 wales / inch. This knitted fabric was subjected to various evaluations.

[0074] Example 2 Using the same 40 count sheath-core spun yarn as in Example 1 and 110 dtex polyethylene terephthalate false twist textured yarn, a circular knitting machine with a mesh structure as shown in Figure 2(b) was knitted on a 33 inch-22 gauge LEC (manufactured by Fukuhara Seiki Co., Ltd.). In Figure 2(b), reference numeral 1 indicates the yarn feeder in which the sheath-core spun yarn is arranged, and reference numeral 2 indicates the yarn feeder in which the polyethylene terephthalate false twist textured yarn is arranged. The knitting conditions during knitting were yarn lengths of 325 mm / 100 wales and 270 mm / 100 wales. Further processing was carried out in the same manner as in Example 1 to obtain a knitted fabric. The basis weight of this knitted fabric was 183 g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 58 courses / inch and 34 wales / inch. This knitted fabric was subjected to various evaluations.

[0075] Example 3 A long-short composite sheath-core spun yarn of 40 was obtained in the same manner as in Example 1, except that polyethylene terephthalate staple fibers (single fiber fineness 1.3 dtex, fiber length 38 mm, crimp number 11 / 25 mm) with a Y-section and an irregularity of 2.2, in which titanium oxide with an average particle size of 0.4 μm was kneaded at 2.0 mass % were used as the fiber of the sheath part. Next, this sheath-core spun yarn and a polyethylene terephthalate false twist textured yarn of 84 dtex were used to knit a circular knitting machine with a mock rody structure shown in FIG. 2(c) with a 33 inch-22 gauge LEC (manufactured by Fukuhara Seiki Co., Ltd.). In FIG. 2(c), reference numeral 1 indicates a yarn feeder in which the sheath-core spun yarn was arranged, and reference numeral 2 indicates a yarn feeder in which the polyethylene terephthalate false twist textured yarn was arranged. The knitting conditions during knitting were a yarn length of 325 mm / 100 wales and 165 mm / 100 wales. Further, processing was performed in the same manner as in Example 1 to obtain a knitted fabric. The weight of this fabric is 170g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 47 courses / inch and 36 wales / inch. This knitted fabric was subjected to various evaluations.

[0076] Example 4 A long-short composite sheath-core spun yarn of 40 was obtained in the same manner as in Example 1, except that polyethylene terephthalate staple fibers (single fiber fineness 2.0 dtex, fiber length 38 mm, number of crimps 8 / 25 mm) with a Y-section and an irregularity of 1.8, in which titanium oxide with an average particle size of 0.4 μm was kneaded at 2.0 mass % were used as the fiber of the sheath part. Next, this sheath-core spun yarn and a polyethylene terephthalate false twist textured yarn of 84 dtex were used to knit a circular knitting machine with a Kanoko structure shown in FIG. 2(d) with a 30 inch-36 gauge JS3 (manufactured by Fukuhara Seiki Co., Ltd.). In FIG. 2(d), reference numeral 1 indicates a yarn feeder in which the sheath-core spun yarn was arranged, and reference numeral 2 indicates a yarn feeder in which the polyethylene terephthalate false twist textured yarn was arranged. The knitting conditions during knitting were a yarn length of 150 mm / 100 wales and 175 mm / 100 wales. Further, processing was performed in the same manner as in Example 1 to obtain a knitted fabric. The weight of this fabric is 143g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 82 courses / inch and 48 wales / inch. This knitted fabric was subjected to each evaluation.

[0077] Example 5 The same as in Example 1, except that a 56 dtex, 6 filament polyethylene terephthalate filament (raw silk) with a circular cross section and 0.5% by mass of titanium oxide was used as the core fiber, was used as the fiber for the core. A 26 inch-28 gauge 3FA (manufactured by Fukuhara Seiki) was used to knit a circular knitting machine with a kanoko structure as shown in FIG. 2(e) using a 30-count sheath-core spun yarn and a 167 dtex polyethylene terephthalate false twisted yarn. In FIG. 2(e), reference numeral 1 indicates a yarn feeder in which the sheath-core spun yarn is arranged, and reference numeral 2 indicates a yarn feeder in which the polyethylene terephthalate false twisted yarn is arranged. The knitting conditions during knitting were a yarn length of 265 mm / 100 wales. Further, processing was performed in the same manner as in Example 1 to obtain a knitted fabric. The basis weight of this knitted fabric was 194 g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 44 courses / inch and 29 wales / inch. This knitted fabric was subjected to various evaluations.

[0078] Example 6 A sheath-core spun yarn of 30 was obtained in the same manner as in Example 1, except that a 56 dtex, 6 filament polyethylene terephthalate filament (raw silk) with a circular cross section and 0.5% by mass of titanium oxide was used as the core fiber, and a polyethylene terephthalate staple fiber with a Y cross section and an irregularity of 2.2 and 2.0% by mass of titanium oxide with an average particle size of 0.4 μm (single fiber fineness 1.3 dtex, fiber length 38 mm, crimp number 11 / 25 mm) was used as the sheath fiber. Next, this sheath-core spun yarn and a 167 dtex polyethylene terephthalate false twist textured yarn were used to knit a circular knitting machine with a half plain stitch structure as shown in FIG. 2(f) with a 26 inch-28 gauge 3FA (manufactured by Fukuhara Seiki Co., Ltd.). In FIG. 2(f), reference numeral 1 indicates a yarn feeder in which the sheath-core spun yarn is arranged, and reference numeral 2 indicates a yarn feeder in which the polyethylene terephthalate false twist textured yarn is arranged. The knitting conditions were yarn length 170 mm / 100 wales. The knitted fabric was processed in the same manner as in Example 1. The weight of the knitted fabric was 216 g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 53 courses / inch and 39 wales / inch. This knitted fabric was subjected to various evaluations.

[0079] Example 7 Using the same 40-count sheath-core spun yarn and 40-count cotton spun yarn as in Example 1, a circular knitting machine with a smooth structure as shown in Figure 2(g) was produced in the same manner as in Example 1. In Figure 2(g), reference numeral 1 indicates the yarn feeder in which the sheath-core spun yarn is arranged, and reference numeral 2 indicates the yarn feeder in which the cotton spun yarn is arranged. The knitting conditions during knitting were a yarn length of 300 mm / 100 wales. Furthermore, except that the grey fabric was dyed with a disperse dye and a reactive dye in a single bath, two-stage method, processing was carried out in the same manner as in Example 1 to obtain a knitted fabric. The basis weight of this knitted fabric was 208 g / m 2 The knit density of the surface, when the cylinder surface was the outside, was 41 courses / inch and 35 wales / inch. This knitted fabric was subjected to various evaluations.

[0080] Comparative Example 1 A mock lody knit fabric as shown in Figure 2(c) was obtained in the same manner as in Example 3, except that a 40-count air spun yarn formed from polyethylene terephthalate staple fibers (single fiber fineness 1.0 dtex, fiber length 38 mm, crimp count 14 / 25 mm) with a Y cross section and an irregularity degree of 2.4, into which 2.0 mass% of titanium oxide with an average particle size of 0.4 μm was kneaded, was used instead of the 40-count sheath-core spun yarn used in Example 3. The spinning was performed under the same conditions as in Example 3, except that no filament core yarn was used. The weight of the obtained knit fabric was 172 g / m 2 The knit density of the surface, when the cylinder surface was facing up, was 47 courses / inch and 36 wales / inch.

[0081] Comparative Example 2 A mock lody knit fabric as shown in Figure 2(c) was obtained in the same manner as in Example 3, except that a 40-count ring spun yarn (spinning conditions: twist number 23.4 times / inch) made of polyethylene terephthalate staple fibers (single fiber fineness 1.0 dtex, fiber length 38 mm, crimp number 14 / 25 mm) with a Y cross section and an irregularity degree of 2.4, into which 2.0 mass% of titanium oxide with an average particle size of 0.4 μm was kneaded, was used instead of the 40-count sheath-core spun yarn used in Example 3. The weight of the obtained knit fabric was 169 g / m 2 The knit density of the surface, when the cylinder surface was facing up, was 48 courses / inch and 35 wales / inch.

[0082] Comparative Example 3 A knitted fabric with a smooth texture as shown in Figure 2(g) was obtained in the same manner as in Example 7, except that a ring-spun yarn (spinning conditions: twist number 23.4 times / inch) made of polyethylene terephthalate staple fibers (single fiber fineness 1.0 dtex, fiber length 38 mm, crimp number 14 / 25 mm) with a Y cross section and an irregularity degree of 2.4, into which 2.0 mass% of titanium oxide with an average particle size of 0.4 μm was kneaded, was used instead of the sheath-core spun yarn (40) used in Example 7. The weight of the knitted fabric obtained was 206 g / m 2 The knit density of the surface, when the cylinder surface was facing up, was 40 courses / inch and 34 wales / inch.

[0083] Comparative Example 4 A smooth textured circular knitting machine as shown in Figure 2(a) was produced using 84 dtex polyethylene terephthalate false twist textured yarn and 33 inch-28 gauge 4AL (manufactured by Fukuhara Seiki Co., Ltd.). The knitting conditions during knitting were yarn length 230 mm / 100 wales. The machine was then processed in the same manner as in Example 1 to obtain a knitted fabric. The basis weight of this knitted fabric was 160 g / m 2 The knit density of the surface, when the cylinder surface was facing up, was 60 courses / inch and 44 wales / inch.

[0084] The property values ​​and evaluation results of the knitted fabrics obtained in the Examples and Comparative Examples are shown in Table 1. In the table, E100 indicates that 100% polyethylene terephthalate was used as the fiber material, and C100 indicates that 100% cotton was used as the fiber material.

[0085] [Table 1]

[0086] As shown in Table 1, the knitted fabrics obtained in Examples 1 to 7 had a low moisture content after the dehydration process in washing, excellent drying properties after dehydration, and reduced occurrence of snags. On the other hand, the knitted fabrics of Comparative Examples 1 to 3 had a higher moisture content after the dehydration process in washing and were inferior in drying properties after dehydration compared to the knitted fabrics of Examples 1 to 7, and were more susceptible to occurrence of snags. In particular, the knitted fabric of Comparative Example 4 was more susceptible to occurrence of snags than the knitted fabrics of Examples 1 to 7. [Explanation of symbols]

[0087] 11 Yarn supply package 12 Feed roller E Apron Belt L Sliver T Trumpet BR Back Roller DR Draft device FR Front roller MR Middle Roller NR Nip Roller PW Package SP Spinning Department TR Third Roller

Claims

1. The yarn contains substantially untwisted sheath-core spun yarn in an amount of 10% by mass or more and 100% by mass or less, The core-sheath spun yarn is a knitted fabric having a core portion containing polyester fibers having a single fiber fineness of 3.5 dtex or more and 15.0 dtex or less, and a sheath portion containing polyester fibers.

2. The knitted fabric according to claim 1, wherein the polyester fibers contained in the sheath portion are polyester staple fibers, and the polyester fibers contained in the core portion are polyester filaments.

3. The knitted fabric according to claim 2, wherein the polyester short fiber contained in the sheath portion has a monofilament fineness smaller than the monofilament fineness of the polyester long fiber contained in the core portion.

4. The knitted fabric according to claim 2, wherein the polyester staple fiber contained in the sheath portion has a single fiber fineness of 0.8 dtex or more and 3.5 dtex or less.

5. The knitted fabric according to claim 2, wherein the polyester staple fiber in the sheath portion has one end closer to the core portion and the other end farther from the core portion, and extends in the longitudinal direction of the core-sheath spun yarn while rotating around the core portion so as to move away from the core portion as it moves from the one end to the other end.

6. The knitted fabric according to claim 2 , wherein the polyester staple fibers contained in the sheath portion have a modified cross section with a degree of modification of 1.6 or more and 3.6 or less.

7. 10. The fabric of claim 1 further comprising false twist textured yarn comprising polyester fibers.

8. The moisture content after dehydration is 5% or more and 25% or less, and 2. The knitted fabric according to claim 1, which has a drying time after dehydration of 10 minutes or more and 35 minutes or less.

9. A gym suit or T-shirt comprising the knitted fabric according to any one of claims 1 to 8.

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