JP7194854B1 - Knitted fabric made of false twisted yarn - Google Patents

Abstract

[PROBLEMS] To provide a knitted fabric which has a soft feel and is excellent in impermeability, water absorption and quick drying properties, and bursting strength by using false twisted yarn having a flat fiber cross section and high crimp. A knitted fabric containing 40% by weight or more of a synthetic fiber multifilament false twisted yarn having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn, wherein the single yarn of the false twisted yarn, The average flatness is 2.0 to 3.0, the standard deviation of the flatness is less than 1.0, the crimp recovery rate measured according to JIS L 1013 8.12 is 30 to 50%, The knitted fabric has a permeation resistance index of 90% or more measured according to JIS L 1923 B method, and a bursting strength of 600 kPa or more measured according to JIS L 1096 8.18 A method. . [Selection figure] None

Description

The present invention relates to a knitted fabric made of false twisted yarn. More specifically, the present invention relates to a knitted fabric comprising a synthetic fiber multifilament false twisted yarn having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn and having a high crimp, It relates to a knitted fabric that is excellent in flexibility, water absorption and quick drying properties, and bursting strength.

Knitted fabrics with excellent stretchability and breathability are suitably used for all types of clothing, regardless of usage such as casual clothing, sportswear, innerwear, and uniforms. Although there are a wide variety of fibers used in knitted fabrics, polyester fibers are widely used because of their easy care properties, chemical resistance, and color resistance to light, and are indispensable for use in clothing. Polyester fibers have been developed in terms of both raw yarn and false twist processing in order to impart properties, water absorption and quick drying properties, and desirable texture.

As a method for imparting anti-permeability to polyester fibers, for example, as described in Patent Document 1 below, titanium oxide is contained in a polymer at a relatively high concentration of 1.7 to 2.5% by weight, A flat polyester fiber having good texture, excellent water absorption and quick drying properties, and anti-permeability is produced by making the spinneret into a specific shape in the spinning stage. However, in this method, the fiber has an irregular shape at the spinning stage, so it is difficult to uniformly apply force to the outer circumference and center of the filament during spinning and false twisting, resulting in unevenness in the irregularity of the single yarn and the orientation of the polymer. As a result, the strength of the fiber tends to decrease, which causes the burst strength of the knitted fabric to decrease.

Further, in Patent Document 2 below, a raw material containing 1.70 to 2.40% by weight of terephthalic acid obtained by depolymerizing polyalkylene terephthalate and diethylene glycol is used to make the cross section of false twisted textured yarn uneven. Polyester made from recycled raw materials that has a regular polygonal shape and has good transparency, water absorption, and deep color properties, and high raw yarn strength, so that the strength and crimp recovery rate are within the specified ranges. A method of making false twisted yarn is disclosed. However, with this method, the flat shape varies, and in order to suppress single yarn breakage and a decrease in raw yarn strength, the crimp recovery rate (CR) must be suppressed to a low range of 15 to 25%. However, it is not possible to achieve both burst strength, water absorption and quick drying properties, and soft texture.

Further, in Patent Document 3 below, 50 to 100% by mass of single fibers of the multifilament constituting the crimped yarn have a hollow portion, and the crimped yarn has a flat cross-sectional shape. , a method for producing a woven or knitted fabric with excellent cooling sensation is disclosed. However, in this method, the crimp recovery rate (CR) is too high, so the crimps accumulate water and hinder its diffusion, lacking in sweat absorption and quick drying, and having a hollow part makes the knitted fabric burst strength. decreases.

Patent Document 4 below describes the manufacture of a sheath-core type polyester flat cross-section fiber having a flat cross section of a fiber, containing a large amount of titanium oxide fine particles in the core, and containing a small amount of titanium oxide fine particles in the sheath. A method is disclosed. However, in this method, the yarn cannot be highly crimped to avoid a decrease in strength due to the high flatness, and the burst strength, water absorption and quick drying properties, and bulky and soft texture of the knitted fabric cannot be achieved at the same time.

In addition, in Patent Document 5 below, at least two false twisted textured yarns are mixed, and the unevenness of the surface of the knitted fabric is adjusted to a predetermined level by using a composite textured yarn in which the number of interlaces remains 100 to 170 / m after dyeing. Disclosed is a method for producing a knitted fabric having a soft texture, stretchability, anti-transparency, and excellent anti-snag properties by controlling the amount within the range. However, in this method, it is necessary to converge highly crimped SZ yarns with a large number of interlaces, so there is a problem of poor perspiration diffusibility.

Patent Document 6 below describes a knitted fabric in which false twisted yarn having a predetermined torque is present at a yarn blend ratio of 30% by weight or more, and the loop density is 50 courses/inch or more and 15 courses/inch or less. , 35 wells / inch or more and 90 wells / inch or less, and the average value of kurtosis (Rku) obtained by measuring the line roughness between 10 mm in the loop knitting direction at a magnification of 25 using a 3D shape measuring machine is 1.0 or more and less than 3.0. The patent describes false twisted yarn by a method in the dyeing process of knitted fabric, such as controlling the presence or absence of heat setting, the temperature, and the temperature increase speed until the temperature in the dyeing bath reaches a peak within a certain range. It is a method that develops crimps and densifies the knitted fabric structure to exhibit anti-snag properties, stretchability and anti-permeability, and does not solve the problem by improving the false twisted yarn itself.

Japanese Patent No. 4128398 JP 2019-99988 A Japanese Patent No. 6409977 Japanese Patent No. 5735377 JP 2017-218698 A Japanese Patent No. 6529622

In view of the current state of the prior art described above, the problem to be solved by the present invention is to use a false twisted yarn having a flat fiber cross section of a single yarn and a high crimp, so that it has a soft texture and is resistant to wear. To provide a knitted fabric excellent in permeability, water absorption and quick drying properties, and bursting strength.

As a result of intensive studies and repeated experiments in order to solve the above problems, the inventors have found that the polyester multifilament raw yarn with a round cross section is false twisted at a predetermined false twist coefficient to form a highly crimped and uniform flat shape. After obtaining a false twisted textured yarn having a single yarn cross section, for example, by adjusting the loop of the knitted fabric structure, for example, the knit:welt ratio, to satisfy the impermeability, water absorption quick drying, and bursting strength. The inventors have unexpectedly found that a knitted fabric can be obtained, and have completed the present invention.

That is, the present invention is as follows.
[1] A knitted fabric containing 40% by weight or more of a synthetic fiber multifilament false twisted yarn having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn, wherein the average of the single yarns of the false twisted yarn The flatness is 2.0 to 3.0, the flatness standard deviation is less than 1.0, the crimp recovery rate measured according to JIS L 1013 8.12 is 30 to 50%, and A knitted fabric having a permeation resistance index of 90% or more measured according to JIS L 1923 B method and a bursting strength of 600 kPa or more measured according to JIS L 1096 8.18 A method.
[2] The knitted fabric according to [1] above, wherein the synthetic fiber multifilament false twisted yarn has a false twist coefficient of 35,000 to 45,000.
[3] The knitting according to [1] or [2] above, wherein the synthetic fiber multifilament false twisted textured yarn has a total fineness of 56 to 176 dtex and a single yarn fineness of 0.3 to 5.0 dtex. ground.
[4] The knitted fabric according to any one of [1] to [3], wherein the knitted fabric has a basis weight of 120 to 220 g/m ² .
[5] The knitted fabric according to any one of [1] to [4], wherein the drying time is within 60 minutes when the 0.6 ml diffusible residual moisture content is less than 10%. Knitted fabric.
[6] The above-mentioned [1]-, wherein the knitted fabric is a circular knitted fabric, and the ratio of (knit): (welt + tuck) of the knitting structure constituting the circular knitted fabric is 1:1 to 10:1 The knitted fabric according to any one of [5].
[7] The knitted fabric is a warp knitted fabric, and the knitting structure constituting the warp knitted fabric is a 2-bar structure combining a Denbi structure and a cord structure, or 3 in which an insertion structure is added to the 2-bar structure. The knitted fabric according to any one of [1] to [5], which is a bar weave.
[8] the following steps:
A synthetic fiber multifilament having a substantially circular cross-sectional shape perpendicular to the fiber axis direction of the single yarn is twisted at a false twist speed of 100 to 300 m / min using a pin false twister at a melting point temperature of -100 ° C. to -100 ° C. False twisting is performed at a false twisting temperature of −60° C. and a draw ratio of 1.50 to 1.65 times. a step of obtaining a synthetic fiber multifilament false twisted yarn having a false twist coefficient of 35000 to 45000, which is less than 0 and has a crimp recovery rate of 30 to 50% measured according to JIS L 1013 8.12; The method for producing a knitted fabric according to any one of the above [2] to [7], comprising a step of knitting using 40% by weight or more of the synthetic fiber multifilament false twisted textured yarn thus obtained to obtain a knitted fabric.

The knitted fabric according to the present invention is a knitted fabric that has a soft texture and is excellent in impermeability, water absorption and quick drying, and bursting strength, so it can be uniforms such as soccer and basketball, athletic shirts for soccer and basketball, outdoor sports shirts for mountaineering, outerwear such as shirts and pants for daily wear, and innerwear such as camisoles and shorts.

FIG. 2 is a knitting structure diagram of the mock rody circular knitted fabric of Example 1. FIG. 2 is a knitting structure diagram of a single hook circular knitted fabric of Example 2. FIG. FIG. 11 is a knitting weave diagram of a flat weave of Example 3; 2 is a knitting structure diagram of a smooth structure of Comparative Example 1. FIG. 11 is a knitting structure diagram of a Kanoko-like circular knitted fabric shown in Comparative Example 3. FIG. FIG. 10 is a knitting structure diagram of back half warp knitted fabrics of Example 6 and Comparative Example 5. FIG.

Hereinafter, embodiments of the present invention will be described in detail.
One embodiment of the present invention is a knitted fabric containing 40% by weight or more of a synthetic fiber multifilament false twisted yarn having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn, the false twisted yarn. The single yarn has an average flatness of 2.0 to 3.0, a standard deviation of flatness of less than 1.0, and a crimp recovery rate measured according to JIS L 1013 8.12 method of 30 to 50%, and the permeation resistance index of the knitted fabric measured according to JIS L 1923 B method is 90% or more, and the bursting strength measured according to JIS L 1096 8.18 A method is 600 kPa or more. It is a characteristic knitted fabric.

The yarn used for the knitted fabric of this embodiment is a synthetic multifilament false twisted yarn, and the cross-sectional shape of the single yarn perpendicular to the fiber axis direction is flat. Synthetic fibers are not particularly limited, but polyester fibers are preferred from the viewpoint of water absorption and quick drying properties and burst strength of the knitted fabric.

The false twisted yarn contained in the knitted fabric of the present embodiment has a flat cross-sectional shape of the cross section perpendicular to the fiber axis direction of the single yarn, and the average flatness of the false twisted yarn is 2.0 to 3. .0, and the standard deviation value (variation) of flatness is less than 1.0. If the average flatness of the cross-sectional shape of the single yarn is in the range of 2.0 to 3.0, diffuse reflection of light occurs due to the flat cross-sectional surface of the single yarn, light diffusion and absorption occur, and the knitted fabric feels transparent. can be reduced, and by having an appropriate gap between the single yarns, a water absorbing and diffusing effect can be exhibited. The standard deviation value (variation) of flatness is less than 1.0, more preferably 0.5 to 0.8. If the standard deviation value (variation) of the flatness is small, it is possible to suppress the decrease in bursting strength caused by uneven single yarn deformation.

The single yarn cross-sectional shape of the raw yarn used for manufacturing the false twisted yarn is preferably a circular cross-section having a flatness of 1.0 to 1.5. By using a multifilament yarn with a round cross-section as a single yarn, it is easy to adjust the average flatness in the range of 2.0 to 3.0 by false twisting, and the twist of the false twisting can reduce the unevenness of flatness. This can prevent large discrepancies. In order to increase the flatness to 3.0 or more, for example, in the false twisting process, it is necessary to significantly deform the cross section of the single yarn from the round cross section, so the false twist temperature and the draw ratio must be set high. It is not preferable because it causes single yarn breakage and a decrease in the strength of the knitted fabric. If the single yarn cross section of the raw yarn is irregular or hollow, there will be a difference in the way the yarn is crushed between the yarn outer circumference, which is susceptible to the stretching force during false twisting, and the yarn center, which is less susceptible to the stretching force, and the standard deviation of the flatness. The value tends to be 1.0 or more, which causes unevenness in the strength of the single yarn and lowers the burst strength of the knitted fabric, which is not preferable.

The crimp recovery rate (CR value) measured according to JIS L 1013 8.12 of the false twisted yarn used for the knitted fabric of this embodiment is 30 to 50%. By setting the crimp recovery rate to 30% or more, the yarn is crimped densely, promoting diffuse reflection of light, improving the anti-transparency of the knitted fabric, and giving the knitted fabric a soft and smooth texture. can be given. If the CR value is less than 30%, crimping of the yarn is poor, diffused reflection of light is not promoted, and the knitted fabric loses its opacity, resulting in a lack of soft touch. In addition, in order to increase the CR value to more than 50%, it is necessary to increase the false twisting temperature and the drawing ratio, which causes single yarn breakage, resulting in a decrease in yarn strength and quality deterioration. If it exceeds 50%, the crimp is too high, and when the fabric is formed into a knitted fabric, the crimp will accumulate sweat, resulting in a decrease in diffusibility, which is not preferable. A crimp recovery rate of 35 to 45% is particularly preferred.

As the polyester fiber, at least one selected from the group consisting of terephthalic acid as the main acid component and alkylene glycol having 2 to 6 carbon atoms, that is, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, and hexamethylene glycol. A polyester containing one as the main glycol component is preferred. Among them, polyethylene terephthalate containing ethylene glycol as a main component and polytrimethylene terephthalate containing trimethylene glycol as a main component are preferable. In addition, if necessary, it may contain a small amount (usually 30 mol % or less) of a copolymerization component. -Hydroxyethoxybenzoic acid, p-oxybenzoic acid, adipic acid, sebacic acid 1,4-cyclohexanedicarboxylic acid, and other aromatic, aliphatic and cycloaliphatic bifunctional carboxylic acids can be mentioned. Examples of diol compounds other than the above glycols include aliphatic, alicyclic and aromatic diol compounds such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycol. can be mentioned.

The polyester may be synthesized by any method. For example, in the case of polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or lower alkyl of terephthalic acid such as dimethyl terephthalate is used. a first stage reaction of transesterifying an ester with ethylene glycol or reacting terephthalic acid with ethylene oxide to form a glycol ester of terephthalic acid and/or a low polymer thereof; It can be prepared by the second step of the reaction by heating the reaction product of the step under reduced pressure to polycondensate until the desired degree of polymerization is achieved.

The polyester preferably contains 1.0 to 2.5% by weight of a matting agent (titanium oxide compound). If the amount of titanium oxide is less than 1.0%, sufficient hiding power cannot be obtained. , It wears knitting needles, etc., and causes a decrease in strength such as fluff and thread breakage.

Inorganic compound particles and organic compounds other than titanium oxide may be used in combination with the polyester, if necessary. For example, ultraviolet absorbers, micropore-forming agents (organic sulfonic acid metal salts), anti-coloring agents, heat stabilizers, flame retardants (antimony trioxide), fluorescent brighteners, coloring pigments, antistatic agents (sulfonic acid metal salts ), a hygroscopic agent (polyoxyalkylene glycol), and a zinc oxide antibacterial agent may be contained in an amount of 0.1% by weight or more.

In the knitted fabric of this embodiment, the false twisted yarn must be contained in the knitted fabric in an amount of 40% by weight or more. 50% by weight or more is preferable, and 70% by weight or more is more preferable. If the mixing ratio of the false twisted yarn is 40% by weight or less, the number of fibers having an irregularity, which will be described later, is small, and the combination of impermeability, water absorption and diffusion, and bursting strength becomes insufficient.

The knitted fabric of this embodiment can be a circular knitted fabric, in which case the circular knitted fabric has a (knit): (welt + tuck) weave ratio (hereinafter referred to as a knit ratio) of 1:1 to 10:1. is preferred, and 1:1 to 5:1 is more preferred. If there are many knit loops, the knitted fabric is dense and has excellent impermeability. cause it to fall apart. Conversely, when the ratio of the welt or tuck structure increases, the bulkiness of the structure and the density of the fibers become too low, which causes a decrease in the impermeability. By using a knitting structure that uses welts and tucks and providing appropriate intervals between knit loops, it is possible to prevent perspiration from accumulating even when highly crimped textured yarn is used, and to exhibit diffusibility.

The knitted fabric of this embodiment can be a warp knitted fabric, and in this case, the warp knitted fabric is a 2-bar (reed) weave consisting of a combination of a Denbi weave and a cord weave, or an insert weave in the two-bar weave. It preferably consists of an added 3-bar structure. The Denbi weave is a weave of a warp-knitted weave whose guide swing is a closed stitch represented by 10/12 or 12/10, or an open stitch represented by 01/21 or 21/01. The cord weave is a closed weave represented by 10/23 or 23/10, or an open weave represented by 01/32 or 32/01. Examples of the combination of these structures include a back half structure in which the front reed is 12/10// and the back reed is 10/23//, and the front reed is 10/12// and the back reed is 12//. 10, such as a double Denbi structure. If the swing of the reed is greater than that of the cord structure, the sinker loop, which is a rod-shaped structure, becomes longer and the fibers overlap more, so sweat tends to accumulate between crimps and loops, resulting in quick drying. cause it to decline. In addition to the above 2-bar design, an insertion design that does not form a loop may be added to form a 3-bar design. For example, a knitted fabric that suppresses static electricity can be knitted by inserting and adding fibers containing conductive carbon with a middle reed.

The knitted fabric of this embodiment has the following formula in an anti-see-through test according to the JIS L 1923 B method:
Anti-transparency index (%) = (Brightness when using black backing/Brightness when using white backing) x 100
is 90% or more, preferably 93% or more, and more preferably 95% or more. If the anti-see-through index is less than 90%, it is not preferable because the wearer will feel uncomfortable when wearing the garment using the knitted fabric because the color of the clothing or undergarments worn underneath will show through.

The knitted fabric of the present embodiment has a bursting strength of 600 kPa or more, preferably 700 kPa or more, and more preferably 1000 kPa or more, as measured according to the JIS L 1096 A method Mullen type bursting strength test. If the bursting strength is 600 kPa or more, the strength suitable for a knitted fabric for clothing can be maintained. If the burst strength is less than 600 kPa, the strength of the knitted fabric is not sufficient, which is not preferable for clothing.

The total fineness of the false twisted yarn contained in the knitted fabric of the present embodiment is preferably 56 to 176 dtex (decitex), more preferably 56 to 110 dtex. The number of filaments in the false twisted yarn is preferably 36-144. The single filament fineness of the false twisted yarn of the present embodiment is preferably 0.3 to 5.0 decitex, more preferably 0.5 to 2.5 decitex. If the single filament fineness of the false twisted yarn is less than 0.3 decitex, the fiber strength is lowered, single filament breakage occurs, and the anti-pilling and anti-snag physical properties deteriorate. On the other hand, if the single filament fineness of the false twisted yarn exceeds 5.0 decitex, the flexural rigidity of the fiber increases, and a soft feel cannot be obtained.

The false twisted yarn contained in the knitted fabric of the present embodiment is preferably a false twisted yarn having a false twist coefficient of 35,000 to 45,000. The false twist coefficient is expressed by the number of twists (unit: T/m) multiplied by the square root of the total fineness after false twisting (unit: dtex).

Another embodiment of the invention comprises the steps of:
A synthetic fiber multifilament having a substantially round cross-sectional shape perpendicular to the fiber axis direction of the single yarn is twisted at a false twisting speed of 100 to 300 m / min using a pin false twister at a melting point temperature of -100 ° C. to -100 ° C. False twisting is performed at a false twisting temperature of −60° C. and a draw ratio of 1.50 to 1.65 times. a step of obtaining a synthetic fiber multifilament false twisted yarn having a false twist coefficient of 35000 to 45000, which is less than 0 and has a crimp recovery rate of 30 to 50% measured according to JIS L 1013 8.12; a step of obtaining a knitted fabric by knitting using 40% by weight or more of the synthetic fiber multifilament false twisted textured yarn thus obtained.

The draw ratio is preferably 1.50 to 1.65 when false twisting so that the resulting false twisted textured yarn has a false twist coefficient of 35000 or more. Usually, when processing with a high false twist coefficient, a high false twist torque is generated in the yarn, and the single yarn existing near the center of the yarn is subjected to a compressive force toward the center, so the flatness tends to be low. On the other hand, the flatness tends to be relatively larger than that in the central portion because the single yarns present in the outer peripheral portion of the yarn are subjected to a circumferential stretching force. At this time, by setting the draw ratio as low as 1.50 to 1.65 times and false twisting, the compressive force toward the central portion is suppressed, and the standard deviation value ( variation) can be suppressed. In other words, false twisted yarn is twisted by contacting rotating bodies (pins, discs, belts, etc.) while pulling the yarn vertically, so if it is a multifilament, the single yarn (filament) on the outer circumference is easily twisted. On the other hand, the filament in the central part is hard to be twisted, so it is hard to deform. In this embodiment, the drawing force that pulls the yarn longitudinally is weakened (the draw ratio is set low), and false twisting is performed at a low speed, thereby suppressing variations in irregularity.

As the false twister, any model such as a pin, belt, or friction disk can be used depending on the type of twisting body. A pin false twister is preferred in order to obtain a highly crimped false twisted yarn while suppressing the crimp to less than 0. The false twist speed is 100-300 m/min, preferably 100-250 m/min, more preferably 100-200 m/min.

The false twist temperature is preferably in the range of -100°C to -60°C, more preferably in the range of -80°C to -50°C, which is the melting point of the synthetic resin constituting the yarn to be processed. If the false twisting temperature is lower than the melting point temperature -100°C, the yarn will not be softened and it will be difficult to sufficiently crimp the yarn, making it impossible to obtain a soft feel. On the other hand, when the melting point temperature exceeds −60° C., the yarn is partially fused and hardened, which is not preferable because it causes bulkiness of the fabric and deterioration of stretchability.

The knitted fabric of the present embodiment needs to contain 40% by weight or more of synthetic fiber multifilament false twisted yarn having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn in order to exhibit sufficient impermeability. be. If semi-stretched polyester (POY) is false twisted at a high draw ratio, it is possible to obtain sufficient strength for knitting a knitted fabric, but it becomes difficult to twist the yarn, and as a result, the crimp of the false twisted yarn is small and anti-transparency. cause a decline in sexuality. Since the false twisting of the present embodiment is performed at a draw ratio as low as 1.50 to 1.65 times, the crystallization and orientation of the fibers are difficult to progress, and it is difficult to develop a high breaking strength as a textured polyester yarn. However, by keeping the standard deviation value (variation) of the flatness to less than 1.0 and suppressing the unevenness of the single filament fineness, the decrease in strength is suppressed, and by increasing the mixing ratio to 40% by weight or more, the transparency and bursting strength are improved. It can hold 600 kPa, which is sufficient strength for clothing. The strength of the false twisted yarn is preferably 3.0 cN/dtex or more, more preferably 3.5 cN/dtex. If it is less than 3.0 cN/dtex, the strength is unstable, and the possibility of yarn breakage during knitting of the knitted fabric increases.

The basis weight of the knitted fabric of this embodiment is preferably 120 to 220 g/m ² , more preferably 150 to 200 g/m ² . If the basis weight is lower than 120 g/m ² , the absolute weight of the flat false twisted yarn is reduced, which is undesirable because the impermeability, water absorption and quick drying properties, and bursting strength are lowered. Conversely, if the basis weight is higher than 220 g/m ² , the clothes become heavy and the fabric tends to be thick, which lowers the water absorption and quick-drying properties, which is not preferable.

In the knitted fabric of the present embodiment, the moisture content falls below 10% within 60 minutes in the 0.6 ml diffusible residual moisture content measurement. If the moisture content falls below 10% within 60 minutes, it indicates that the water absorption and diffusion is good. You can move on and be comfortable. If it takes longer than 60 minutes for the moisture content to reach 10%, the clothes dry slowly when wet with perspiration, giving discomfort to the wearer.

The knitted fabric of this embodiment can be produced using a normal knitting machine. As for the dyeing process of the knitted fabric, a normal dyeing finishing process can be used. For example, a jet dyeing machine, a wince dyeing machine, or the like can be arbitrarily selected. The heat setting by the pin tenter should also be moderately stretched so as not to wrinkle the knitted fabric. In addition, as ancillary processing, weight reduction processing, antibacterial and deodorant processing, antifouling processing, etc. can be appropriately imparted according to the final required properties so as not to impair the water absorbency. As a water-absorbing treatment, it is preferable to apply hydrophilizing agents such as polyethylene glycol diacrylate, derivatives thereof, polyethylene terephthalate-polyethylene glycol copolymer, etc. to the knitted fabric in the same bath during dyeing, or to apply it to the knitted fabric in the final setting process. . Also, the amount of the hydrophilizing agent attached can be 0.25 to 0.5% by weight based on the weight of the knitted fabric.

Hereinafter, a method for producing a knitted fabric knitted using the composite textured yarn of the present invention and its physical properties will be described in detail with reference to examples. However, the present invention is not limited to these examples. First, methods for measuring various physical properties and the like used in the examples will be described.

(1) Flatness The yarn is unwound from the knitted fabric and one yarn of appropriate length is collected. The collected filament was embedded in paraffin, a cross-sectional section of the filament was cut out with a microtome, and a filament cross-sectional photograph of the section was taken with an optical microscope. At this time, the image was taken so that all the single filaments could fit into one image. The length was measured with A being the long side and B being the short side from end to end measured so as to pass through the center of the cross section of the single filament. Formula (1) below:
Flatness = A/B (1)
The flatness was calculated by
The flatness of all the single filaments was calculated and used as the flatness of the first filament. The unraveling of the same knitted fabric is further advanced, and the flatness of the second yarn collected from another portion (preferably 10 or more yarns collected from the first collected portion) is calculated by the same operation, The flatness of the target yarn was obtained by averaging it with the flatness of the first yarn. Further, the flatness was measured for both the multifilament false twisted yarn taken out from the knitted fabric and the raw yarn to be subjected to false twisting.

(2) Standard deviation value of flatness The average flatness calculated from the flatness of all single filaments was determined by the standard deviation formula. That is, the positive square root value of the value obtained by dividing the sum of the squares of the difference between the flatness of each single filament and the average flatness by the total number of filaments was obtained.

(3) Crimp recovery rate (CR)
Based on the JIS L 1013 8.12 method, the elastic modulus measured and calculated by the following method was defined as the crimp recovery rate. A load of 0.176 mN×indicated number of tex was applied to make a skein of 40 cm length and 10 turns. This skein was pretreated by boiling in boiling water for 20 minutes. The pretreated skein was immersed in water at a temperature of 20±2°C for 2 minutes with a load of 0.176 mN x 20 x indicated tex number and a further load of 8.82 mN x 20 x indicated tex number, and then the skein The length was measured, the load of 8.82 mN×20×display tex number was immediately removed, and the skein was allowed to stand for 2 minutes.
The test was performed 5 times, and the average value was taken as the crimp recovery rate CR.
Stretch recovery rate (%) = a - b / a x 100 (2)
a: Skein length (mm) when a load of 0.176 mN × 20 × indicated tex number is further applied with a load of 8.82 mN × 20 × indicated tex number
b: Skein length (mm) when a load of 0.176 mN x 20 x indicated number of tex is applied

(4) Total fineness of false twisted yarn (dtex)
The false twisted yarn was allowed to stand for one day in a standard environment (20° C.×65% RH) for humidity conditioning. After that, a skein was produced by winding it for 100 m using a measuring machine, and the weight was measured. The value was multiplied by 100 to obtain the total fineness. Measurement was performed twice, and the average value was taken as the total fineness of the target yarn.

(5) False twist coefficient The false twist coefficient is the following formula:
False twist coefficient = number of twists (T/m) x D ^1/2
It was calculated from {In the formula, D: total fineness of false-twisted textured yarn}. The number of twists was measured based on the JIS L 1013 8.13 method.

(6) Knit: Welt + Tuck Ratio (Knit Ratio)]
The numbers of knit loops, welts, and tucks were counted based on the complete organization chart of the knitted structure. After that, the number of knit loops was divided by the number of welts + tucks to obtain a ratio to the number of knit loops when the ratio of welts + tucks was 1.

(7) Anti-transparency index Based on the JIS L 1923 B method, measure the brightness when there is a white backing under the fabric and when there is a black backing, and use the following formula:
Anti-transparency index (%) = (Brightness when using black backing/Brightness when using white backing) x 100
The anti-see-through index was calculated by

(8) Bursting Strength JIS L 1096 8.18 Method A Bursting strength was measured according to the Mullen method.

(9) Fabric weight A 10 cm × 10 cm sample is cut out from a knitted fabric that has been conditioned at 20 ° C. × 65% RH for one day, and the weight is measured in g with a precision balance and multiplied by 100 to convert to g / m ² . I asked for the texture of the ground.

(10) 0.6 ml diffusible residual moisture content (quick drying)
A 15 cm x 15 cm sample was cut from the knitted fabric that had been conditioned at 20°C x 65% RH for one day, and the initial weight (W ₀ ) was determined. Weigh 0.6 ml of water droplets with a precision balance, absorb the water into the sample, and measure the weight (W _t ) every 5 minutes, using the following formula:
0.6 ml diffusible residual moisture content (%)={(W _t −W ₀ )/0.6}×100 The time at which the moisture content fell below 10% was defined as the drying time (minute).

[Example 1]
A semi-stretched polyester 144 dtex/36 f having a titanium oxide content of 1.0% by weight and a flatness of 1.0 is subjected to a false twisting speed of 100 m/min, a draw ratio of 1.50, and a twist number of 4,200 using a pin false twister. False twisting was performed in the same manner as above to obtain a false twisted yarn having a single filament fineness of 2.41 dtex and a filament fineness of 87 dtex/36 f. The resulting false twisted yarn had a flatness of 2.0, a standard deviation of flatness of 0.75, a crimp recovery rate of 39.7%, a breaking strength of 3.3 cN/dtex, and a false twist coefficient of 39,174. there were. This yarn is fed to the yarn feeders F1 to F6 of the organization chart shown in FIG. A greige of mock rody tissue was produced. Then, the fabric was expanded and refined at 80°C, preset at 190°C, added with a water absorbing agent, and dyed at 130°C for 60 minutes. Thereafter, the fabric was moderately stretched to remove wrinkles and subjected to final setting at 170°C to obtain a white fabric. The fabric thus obtained had a basis weight of 156 g/m ² , an impermeability index of 93.9, a bursting strength of 1150 kPa, and a drying time of 55 minutes as measured by diffusible residual moisture content.

[Example 2]
A semi-stretched polyester 144 dtex/36 f having a titanium oxide content of 2.5% by weight and a flatness of 1.0 is subjected to a false twisting speed of 100 m/min, a draw ratio of 1.50, and a twist number of 4,200 using a pin false twister. False twisting was performed in the same manner as above to obtain a false twisted yarn having a single filament fineness of 2.41 dtex and a filament fineness of 87 dtex/36 f. The resulting false twisted yarn had a flatness of 2.0, a standard deviation of flatness of 0.75, a crimp recovery rate of 39.7%, a breaking strength of 3.1 cN/dtex, and a false twist coefficient of 39,174. there were. This yarn is fed to the yarn feeders F1 to F6 of the organization chart shown in FIG. A greige of mock rody tissue was produced. Then, the fabric was expanded and refined at 80°C, preset at 190°C, added with a water absorbing agent, and dyed at 130°C for 60 minutes. Thereafter, the fabric was moderately stretched to remove wrinkles and subjected to final setting at 170°C to obtain a white fabric. The fabric thus obtained had a basis weight of 160 g/m ² , an impermeability index of 95.1, a bursting strength of 1115 kPa, and a drying time of 55 minutes as measured by diffusible residual moisture content.

[Example 3]
A semi-stretched polyester of 140 dtex/72 f having a titanium oxide content of 2.5% by weight and a flatness of 1.0 is subjected to a false twisting speed of 150 m/min, a draw ratio of 1.50, and a twist number of 4,100 using a pin false twister. False twisting was carried out in the same manner as above to obtain a false twisted yarn of 91 dtex/72 f and a single yarn fineness of 1.26 dtex. The resulting false twisted yarn had a flatness of 2.1, a standard deviation of flatness of 0.60, a breaking strength of 3.4 cN/dtex, a crimp recovery rate of 35.6%, and a false twist coefficient of 39,111. there were. This yarn is fed to yarn feeders F1 and F3 of the organization chart shown in FIG. A greek machine with a single hook structure having a mixing ratio of 51.9% and a knit ratio of 1:1 was produced. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 120 g/m ² , a permeation resistance index of 93.4, a bursting strength of 755 kPa, and a drying time of 50 minutes as measured by diffusible residual moisture content.

[Example 4]
Using the same 91dtex/72f textured yarn as in Example 3, a 32-gauge double circular knitting machine manufactured by Fukuhara Seiki Co., Ltd. is used to feed the yarn feeders F1 to F4 of the organization chart shown in FIG. A flat weave greige with a 100% knit ratio and a knit ratio of 3:1 was produced. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 195 g/m ² , an impermeability index of 97.1, a bursting strength of 1142 kPa, and a drying time of 60 minutes as measured by diffusible residual moisture content.

[Example 5]
A semi-stretched polyester of 128 dtex/72 f having a titanium oxide content of 2.5% by weight and a flatness of 1.0 is subjected to a false twisting speed of 150 m/min, a draw ratio of 1.60, and a twist number of 4500 using a pin false twister. False twisting was carried out as in the above manner to obtain a false twisted yarn of 80 dtex/72 f and a single yarn fineness of 1.1 dtex. The resulting false twisted yarn had a flatness of 2.5, a standard deviation of flatness of 0.92, a breaking strength of 3.1 cN/dtex, a crimp recovery rate of 41.3%, and a false twist coefficient of 40249. Met. This yarn is fed to the yarn feeders F1 to F6 of the organization chart shown in FIG. I made a gray machine. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 155 g/m ² , an impermeability index of 93.8, a bursting strength of 612 kPa, and a drying time of 60 minutes as measured by diffusible residual moisture content.

[Example 6]
Semi-stretched polyester 135 dtex/36 f having a titanium oxide content of 2.5% by weight and a flatness of 1.5 is subjected to a false twisting speed of 150 m/min, a draw ratio of 1.53, and a twist number of 4,200 using a pin false twister. A false-twisted yarn having a single filament fineness of 2.44 dtex was obtained by performing false-twisting as described above. The resulting false twisted yarn had a flatness of 3.0, a standard deviation of flatness of 0.8, a breaking strength of 3.6 cN/dtex, a crimp recovery rate of 36.8%, and a false twist coefficient of 38493. Met. This yarn is fed to the yarn feeders F1 to F6 of the organization chart shown in FIG. A greige of mock rody tissue was produced. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 170 g/m ² , an impermeability index of 96.6, a burst strength of 675 kPa, and a drying time of 50 minutes as measured by diffusible residual moisture content.

[Example 7]
Using a 28-gauge tricot warp knitting machine manufactured by Karl Mayer, normal polyester textured yarn 56 decitex 24 filament was used for the front reed, and 91 dtex / 72f textured yarn similar to Example 3 was used for the back reed. A gray fabric with a back half structure having a front reed of 12/10// and a back reed of 10/23// was produced. Then, dyeing treatment was performed in the same manner as in Example 2. The fabric thus obtained had a basis weight of 164 g/m ² , an impermeability index of 95.2, a bursting strength of 962 kPa, and a drying time of 45 minutes as measured by diffusible residual moisture content.

[Comparative Example 1]
A core-sheath type semi-stretched polyester 135dtex/36f having a flatness of 1.0 and containing 7.0% by weight of titanium oxide in the core portion and 0.5% by weight of titanium oxide in the sheath portion was subjected to a belt friction false twister. , false twisting was performed at a false twist speed of 350 m/min, a draw ratio of 1.50, and a twist number of 3000 T/m to obtain a false twisted yarn of 88 dtex/36 f and a single yarn fineness of 2.44. The resulting false twisted yarn had a flatness of 1.4, a flatness variation of 0.28, a breaking strength of 3.3 cN/dtex, a crimp recovery rate of 26.8%, and a false twist coefficient of 28,142. This yarn is fed to the yarn feeders F1 and F2 of the organization chart shown in FIG. I made a greige machine. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 151 g/m ² , an impermeability index of 95.3, a bursting strength of 1150 kPa, and a drying time of 75 minutes as measured by diffusible residual moisture content.
This comparative example is a comparative example in which the sheath-core type anti-see-through yarn is simply strongly crimped. Although the permeability and bursting strength are satisfactory, the loop ratio of the knitted structure is poor and the flatness is insufficient, resulting in poor water absorption and quick drying properties.

[Comparative Example 2]
Semi-stretched polyester 56 dtex/36 f having a titanium oxide content of 0.5% by weight and a flatness of 1.0 was subjected to a false twisting speed of 400 m/min using an IVF-910 disk friction type false twister manufactured by Ishikawa Seisakusho Co., Ltd. False twisted yarns in the false twist direction Z and the false twist direction S were prepared at a draw ratio of 1.60, respectively, and the two yarns were entangled at 110 pieces/m with an interlace nozzle to obtain a 72 dtex/72 f composite textured yarn. . The resulting textured yarn had a flatness of 1.9, a flatness variation of 0.75, a breaking strength of 4.1 cN/dtex, a crimp recovery rate of 35.6%, and a false twist coefficient of 33,516. This composite yarn is supplied to the first, third, fourth, and sixth yarn feeders (F1, F3, F4, F6) in the knitting structure shown in FIG. 1 by a 32-gauge double circular knitting machine manufactured by Fukuhara Seiki Co., Ltd. At the same time, ordinary polyester 84dtex/72f textured yarn was supplied to the second and fifth yarn feeders (F2, F5) to obtain a mock lody circular knitted fabric with a mixture ratio of 72dtex/72f composite textured yarn of 70%.
Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 175 g/m ² , an impermeability index of 96.7, a bursting strength of 1200 kPa, and a drying time of 65 minutes as measured by diffusible residual moisture content.
This comparative example is a comparative example in which a highly crimped yarn having a torque of 0, which is produced by combining SZ textured yarns, is used, and which has an anti-see-through property. Although the crimp recovery rate and the knit ratio were satisfied, the flatness was low, so the quick-drying property was low.

[Comparative Example 3]
A semi-stretched polyester of 135 dtex/72 f having a titanium oxide content of 2.5% by weight and a flatness of 2.0 was subjected to a false twisting speed of 300 m/min, a draw ratio of 1.61, and a twist number of 4200 using a pin false twister. False twisting was performed to obtain a false twisted yarn of 84 dtex/72 f and a single yarn fineness of 1.16 dtex. The resulting false twisted yarn had a flatness of 2.4, a standard deviation of flatness of 1.2, a breaking strength of 2.5 cN/dtex, a crimp recovery rate of 42.0%, and a false twist coefficient of 38493. there were. This yarn is fed to the yarn feeders F1 to F6 of the organization chart shown in FIG. A greige of mock rody tissue was produced. Then, the fabric was expanded and refined at 80°C, preset at 190°C, added with a water absorbing agent, and dyed at 130°C for 60 minutes. Thereafter, the fabric was moderately stretched to remove wrinkles and subjected to final setting at 170°C to obtain a white fabric. The fabric thus obtained had a basis weight of 160 g/m ² , an impermeability index of 95.2, a bursting strength of 482 kPa, and a drying time of 60 minutes as measured by diffusible residual moisture content.
This comparative example is a comparative example in which the flatness is within the range and the variation in flatness is high and is out of the range. Bursting strength was not reached.

[Comparative Example 4]
Semi-stretched polyester 117 dtex/30 f with a W-shaped cross section having a titanium oxide content of 2.5% by weight and a flatness of 3.0 was subjected to a false twisting speed of 600 m/min with a disc friction false twister at a draw ratio of 1.40. False twisting was performed at a twist number of 3011 to obtain a textured yarn having a single yarn fineness of 2.80 and 84 dtex/30f. The resulting textured yarn had a flatness of 3.3, a flatness variation of 1.18, a breaking strength of 2.9 cN/dtex, a crimp recovery rate of 34.1%, and a false twist coefficient of 27,660. This textured yarn is supplied to the yarn feeder F1 with the knitting structure shown in FIG. A shrinkable polyester of 33 dtex/12 f was supplied to F3 to obtain a Kanoko-like circular knitted fabric with a W-shaped cross section of 84 dtex/30 f processed yarn at a blend ratio of 25.5% and a knit ratio of 4:1. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 167 g/m ² , an impermeability index of 92.4, a bursting strength of 476 kPa, and a drying time of 45 minutes as measured by diffusible residual moisture content.
This comparative example is a comparative example in which an anti-see-through yarn, which is a modified cross-section yarn, is used instead of the original yarn. The irregularity was high and the knit ratio was satisfactory, so it was excellent in water absorption and quick drying, but the bursting strength was low due to the large variation in irregularity.

[Comparative Example 5]
Using a Karl Mayer 28-gauge tricot warp knitting machine, normal polyester textured yarn 56 decitex 24 filament was used for the front reed, and 84 dtex/30f textured yarn similar to Comparative Example 4 was used for the back reed. A greige fabric with a back half structure having a reed of 12/10// and a back reed of 10/23// was produced. Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 165 g/m ² , an impermeability index of 94.4, a bursting strength of 571 kPa, and a drying time of 60 minutes as measured by diffusible residual moisture content. This comparative example is a comparative example of a tricot fabric using the yarn of Comparative Example 4 (an example of high flatness and high variation). Bursting strength deteriorated.

[Comparative Example 6]
A semi-stretched polyester of 140 dtex/72 f having a titanium oxide content of 2.5% by weight and a flatness of 1.0 was subjected to a false twisting speed of 500 m/min, a draw ratio of 1.70 times, and a twist number of 2900 using a disc friction false twister. to obtain a 86dtex/72f textured yarn. The resulting textured yarn had a flatness of 1.5, a flatness variation of 0.45, a breaking strength of 3.6 cN/dtex, a crimp recovery rate of 28.0%, and a false twist coefficient of 26,893. Using this composite yarn, a greige fabric having a smooth texture consisting only of knit loops was produced using a 28-gauge double circular knitting machine manufactured by Fukuhara Seiki Co., Ltd.
Then, dyeing treatment was performed in the same manner as in Example 1. The fabric thus obtained had a basis weight of 145 g/m ² , an impermeability index of 89.0, a burst strength of 970 kPa, and a drying time of 70 minutes as measured by diffusible residual moisture content.
This comparative example is a comparative example of a knitted fabric using textured yarn experimentally produced at a high speed and a high draw ratio, and having an anti-see-through property. Although the bursting strength was high, the crimp was low and the degree of flatness was low.
The results of Examples 1 to 7 and Comparative Examples 1 to 6 are shown in Tables 1 and 2 below.

The knitted fabric according to the present invention is a knitted fabric that has excellent texture while satisfying impermeability, water absorption and quick drying, and bursting strength, so uniform clothing such as gym clothes and uniform shirts for students, nursing care, hospitals, and factory white coats , athletic shirts such as soccer and basketball, outdoor sports shirts such as mountain climbing, outerwear such as shirts and pants for daily wear, and innerwear such as camisoles and shorts.

Claims (8)

Knitting containing 40% by weight or more of multifilament false-twisted textured yarn of polyester fiber having a flat cross-sectional shape perpendicular to the fiber axis direction of the single yarn and having a titanium oxide content of 1.0 to 2.5% by weight. The ground, the average flatness of the single yarn of the false twisted textured yarn is 2.0 to 3.0, the standard deviation of the flatness is less than 1.0, JIS L 1013 8.12 method The crimp recovery rate of the false twisted yarn measured according to JIS L 1923 B method is 30 to 50%, and the anti-transparency index of the knitted fabric measured according to JIS L 1923 B method is 90% or more, and JIS L 1096 8 .18 A knitted fabric characterized by having a bursting strength of 600 kPa or more as measured according to A method. The knitted fabric according to claim 1, wherein the polyester fiber multifilament false twisted yarn has a false twist coefficient of 35,000 to 45,000. The knitted fabric according to claim 1 or 2, wherein the polyester fiber multifilament false twisted yarn has a total fineness of 56 to 176 dtex and a single yarn fineness of 0.3 to 5.0 dtex. The knitted fabric according to claim 1 or 2, wherein said knitted fabric has a basis weight of 120 to 220 g/m ² . The knitted fabric according to claim 1 or 2, wherein the knitted fabric has a drying time of less than 60 minutes when the 0.6 ml diffusible residual moisture content is less than 10%. The knitted fabric according to claim 1 or 2, wherein the knitted fabric is a circular knitted fabric, and the ratio of (knit): (welt + tuck) of the knitted structure constituting the circular knitted fabric is 1:1 to 10:1. Knitted fabric. The knitted fabric is a warp knitted fabric, and the knitting structure constituting the warp knitted fabric is a 2-bar structure in which a denim structure and a cord structure are combined, or a 3-bar structure in which an insertion structure is added to the 2-bar structure. The knitted fabric according to claim 1 or 2, wherein The following steps:
A polyester fiber multifilament having a substantially round cross-sectional shape perpendicular to the fiber axis direction of the single yarn and a titanium oxide content of 1.0 to 2.5% by weight is processed using a pin false twister. False twisting is performed at a false twisting speed of 100 to 300 m/min, a melting point of the polyester fiber of −100° C. to −60° C., and a draw ratio of 1.50 to 1.65 times, and the average flatness of the single yarn is 2.0 to 3.0, the standard deviation of the flatness is less than 1.0, and the crimp recovery rate of the false twisted yarn measured according to JIS L 1013 8.12 is 30 to 50%. A step of obtaining a polyester fiber multifilament false twisted yarn having a false twist coefficient of 35000 to 45000; and a step of knitting using 40% by weight or more of the obtained polyester fiber multifilament false twisted yarn to obtain a knitted fabric. The method for producing the knitted fabric according to claim 1 or 2, comprising;

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