Snag-resistant knitted fabric

Abstract

To provide a knitted fabric having anti-snagging property and stretchability required for uniform and others.SOLUTION: A knitted fabric is formed of a single knitted fabric and has a knit-tack unit structure at least on one surface thereof. At least a portion of the knit-tack unit structure is constituted from a false-twisted yarn having 40 to 95% of stretch elongation rate. Ratio of the knit-tack unit structure constituted of the false-twisted yarn having 40 to 95% of stretch elongation rate to a whole texture constituting the one surface is 25 to 100%. The false-twisted yarn is preferably a conjugate composite fiber. It is preferable that course density is 50 (piece / 2.54 cm) or more and 95 (piece / 2.54 cm) or less and wale density is 45 (piece / 2.54 cm) or more and 80 (piece / 2.54 cm) or less on the one surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a knitted fabric having stretchability and snag resistance, suitable for use in clothing such as working uniforms. [Background technology]

[0002] Knitted fabrics have superior characteristics compared to woven fabrics, such as a softer feel and better stretchability, and are therefore widely used in innerwear, sportswear, etc. However, compared to woven fabrics, knitted fabrics tend to have lower pilling, snag resistance, and abrasion resistance, making them difficult to use as uniform materials for workwear, etc.

[0003] For this reason, various studies have been conducted to improve the snag resistance of knitted fabrics. For example, a method of twisting the yarns that make up the knitted fabric has been proposed to increase the binding force of the yarns that appear on the surface of the knitted fabric (see Patent Document 1). However, the knitted fabric obtained by this method has the problem of losing the soft texture and stretchability that are inherent characteristics of knitted fabrics.

[0004] Also, a snag-resistant knitted fabric has been proposed that uses a low-torque composite yarn obtained by entangling a doubled yarn of a false-twisted yarn having a torque in the S direction and a false-twisted yarn having a torque in the Z direction (see Patent Document 2). While this method can produce a knitted fabric with sufficient snag resistance, it requires producing separate false-twisted yarns in the S direction and Z direction and then entangling the doubled yarn, which makes the manufacturing process complicated and involves cumbersome work, making it economically disadvantageous.

[0005] Furthermore, a knitted fabric that has stretchability and snag resistance, as well as excellent firmness and a soft feel, has been proposed, which includes a composite false-twisted yarn consisting of a yarn containing a conjugate false-twisted yarn A and a non-conjugate false-twisted yarn B, and in which the number of entanglements of the composite false-twisted yarn is 100 or more / m, the torque twist number is 30 T / m or less, and the difference in crimp expression rate is 5 to 30% (see Patent Document 3). However, this method requires a step of using both conjugate false-twisted yarn and non-conjugate false-twisted yarn and entangling them strongly, which makes the manufacturing process complicated and cumbersome, and is therefore economically disadvantageous. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-247149 [Patent Document 2] WO2008 / 001920 publication [Patent Document 3] Japanese Patent Publication No. 2022-166393 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention was devised to solve the above-mentioned problems of the prior art, and its object is to provide a knitted fabric that combines snag resistance and stretchability required for use in uniforms, etc. Another object of the present invention is to provide a knitted fabric that is optimal for use in uniforms, in which even if colored antistatic yarns are blended, the antistatic yarns are not easily visible through the surface. [Means for solving the problem]

[0008] It has been thought that in knitted fabrics consisting of knits, tucks, and welts, the use of many tucks significantly changes the size of the knit loops within the knitted fabric, resulting in greater unevenness on the knitted fabric surface, making the knitted fabric more susceptible to snagging and more likely to occur snagging. However, as a result of extensive research, the present inventors have discovered that by using a specific false-twisted yarn with a high stretch elongation rate to impart a knit-tuck basic unit structure to the knitted fabric surface, it is possible to achieve high anti-snag properties that were previously unthinkable while still maintaining stretchability, leading to the completion of the present invention.

[0009] That is, the present invention has the following features (1) to (4). (1) A knitted fabric consisting of a single knit having a knit-tuck unit structure on at least one side thereof, wherein at least a part of the knit-tuck unit structure is made of a false twisted yarn having a stretch elongation rate of 40 to 95%, and the ratio of the knit-tuck unit structure made of a false twisted yarn having a stretch elongation rate of 40 to 95% to the entire structure constituting the one side is 25 % or more and 100% less than and wherein at least one surface includes both knit-tuck and all-knit unit structures. (2) The knitted fabric according to (1), wherein the false twisted yarn having a stretch elongation rate of 40 to 95% is made of conjugate composite fibers. (3) A knitted fabric as described in (1), characterized in that the course density on one side is 50 (pieces / 2.54 cm) or more and 95 (pieces / 2.54 cm) or less, and the wale density is 45 (pieces / 2.54 cm) or more and 80 (pieces / 2.54 cm) or less. (4) The knitted fabric according to (2), characterized in that the conjugate composite fiber is made of polybutylene terephthalate and polyethylene terephthalate, and the knit-tuck unit structure composed of the twisted yarn of the conjugate composite fiber constitutes 40 to 100% of the structure constituting one side. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a knitted fabric that has both stretchability and snag resistance and is suitable for clothing such as a working uniform. Furthermore, even when a colored antistatic yarn is used in the knitted fabric of the present invention, the antistatic yarn can be made less visible through the surface. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a stitch configuration diagram consisting of only knit-tuck unit structures. [Figure 2] 2(a) and (b) are knitting structure diagrams for explaining the knit-tuck unit structure and how to count the number of knit loops, tuck loops, and welts. [Figure 3] FIG. 3 is a knitting structure diagram of the knitted fabric of Example 1. [Figure 4] FIG. 4 is a knitting structure diagram of the knitted fabric of Example 3. [Figure 5] FIG. 5 is a knitting structure diagram of the knitted fabric of Example 5. [Figure 6] FIG. 6 is a knitting structure diagram of the knitted fabric of Comparative Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0012] The knitted fabric of the present invention is knitted on a knitting machine with a single or double needle bed. Since either the front or back side of a double knit knitted on a double knitting machine can be used as the front side of the product, for convenience in this invention, these will be referred to as one side and the other side, and the side that is expected to be used as the front side of the final product will be referred to as one side.

[0013] The knitted fabric of the present invention is characterized by having a knit-tuck unit structure (hereinafter also referred to as a "knit-tuck basic structure" or "knit-tuck repeat structure") on at least one side of the knitted fabric, which is composed of a false-twisted yarn with a stretch elongation rate of 40 to 95% (hereinafter also referred to as a high-stretch false-twisted yarn). An example of a knit-tuck unit structure is shown in FIG. 1. FIG. 1 is a stitch configuration diagram consisting only of knit-tuck unit structures. When one side of the knitted fabric comes into contact with something, the upper side of the knit loop becomes a convex part on the knitted fabric surface, making it prone to getting caught there. However, in the knit-tuck unit structure, the area where the tuck yarn of the previous course and the apex of the knit loop meet (the area indicated by the arrow in FIG. 1 ) becomes a convex part on the knitted fabric surface, where the tuck of the previous course, the apex of the knit loop, and the sinker loop of the next course overlap. If the knit loops are sufficiently small, the yarns will constrain each other, making it difficult for the fibers to be pulled out. Specifically, in the present invention, the knit-tuck unit structure formed on one side is made of a highly stretchable and extensible false-twisted yarn. This highly stretchable and extensible false-twisted yarn shrinks significantly during processing, developing crimps, reducing the size of the knit loops and making them very tight, making it difficult for the fibers to be pulled out. This is believed to enhance snag resistance in the present invention. That is, false-twisted yarns with a high stretch and extensibility develop very high crimps, but the apparent upper yarn shrinks significantly due to the development of crimps, causing the knitted fabric to shrink and the knit loops to become smaller. Furthermore, the yarn becomes bulky during dyeing, increasing the apparent thickness of the yarn and reducing the gaps within the knit loops. It is believed that the smaller knit loops tighten the knitted fabric, improving snag resistance and also improving see-through resistance.

[0014] When the knitted fabric is single knit, there is a single layer of knit loops, but there is a front and back, called the sinker loop surface and the knit loop surface, and on either side, the overlapping parts become the convex parts of the uneven knitted surface. Incidentally, when the knitted fabric is double knit, both the back and front sides are knit loop surfaces.

[0015] The stretch extension percentage of the highly stretchable false-twisted yarn used in the present invention is 40 to 95%, preferably 50 to 95%, and more preferably 60 to 95%. If the stretch extension percentage is below this range, it becomes difficult to achieve both stretchability and snag resistance in the knitted fabric. If it exceeds this range, although the stretchability will be sufficient, the quality and physical properties of the false-twisted yarn tend to become unstable, which in turn leads to greater variations in the density and basis weight of the knitted fabric and makes it difficult to stabilize the quality of the appearance, etc. By controlling the stretch extension percentage within the above range, it is possible to impart to the knitted fabric appropriate stretchability, snag resistance, and even anti-see-through properties.

[0016] In the present invention, the hot water dimensional change rate of the highly stretchable false-twisted yarn is preferably -15.0% to -4.5%, more preferably -12.0% to -5.0%. If the hot water dimensional change rate is lower than the above range, it is difficult to shorten the loop length of the knitted fabric by hot water treatment during processing, and it is difficult to form a dense structure on one side. As a result, it becomes difficult to obtain sufficient snag resistance. If the hot water dimensional change rate exceeds the above range, the knitted fabric properties and appearance tend to vary greatly, making it difficult to obtain stable quality. Note that the - (minus) in the hot water dimensional change rate indicates the shrinkage of the sample, and the larger the - (minus) number, the higher the shrinkage rate.

[0017] In the present invention, the highly stretchable false-twisted yarn is preferably a conjugate composite fiber. A conjugate composite fiber is a single fiber formed by bonding two or more types of resins together. Examples of the composite fiber include composite fibers with a side-by-side structure or a core-sheath structure containing both polybutylene terephthalate and polyethylene terephthalate, or polytriethylene terephthalate and polyethylene terephthalate. The composite fiber preferably contains a total of 90% by mass or more of polybutylene terephthalate (or polytriethylene terephthalate) and polyethylene terephthalate, more preferably 95% by mass or more, and even more preferably 99% by mass or more. Furthermore, the composite fiber preferably contains 40 parts by mass or more and 200 parts by mass or less of polybutylene terephthalate (or polytriethylene terephthalate) per 100 parts by mass of polyethylene terephthalate, more preferably 70 parts by mass or more and 150 parts by mass or less, and even more preferably 90 parts by mass or more and 110 parts by mass or less. In the case of a core-sheath structure, it is desirable for the core to be eccentrically positioned within the sheath in order to produce crimp. The cross-sectional shape of the fiber can be round, elliptical, triangular, square, or other polygonal cross-section, or hollow cross-section. Of these, round and elliptical cross-sections are preferred, with round being more preferred. The composite fiber may contain various additives within a range that can utilize the above-mentioned crimp properties.

[0018] In the present invention, the total fineness of the highly stretchable, extended false-twisted yarn is preferably 30 dtex to 250 dtex, more preferably 50 dtex to 180 dtex. If the total fineness is less than this range, the knitted fabric will be too thin and difficult to use, while if it exceeds this range, the knitted fabric will be too heavy and thick and difficult to use. The single yarn fineness of the highly stretchable, extended false-twisted yarn is preferably in the range of 0.3 dtex to 3.0 dtex. If the single yarn fineness is less than this range, the knitted fabric will be more susceptible to snagging and its anti-snag properties will be reduced, while if it exceeds this range, the texture will be stiff. The highly stretchable, extended false-twisted yarn may also contain additives such as inorganic particles such as titanium particles, ultraviolet absorbers, conductive agents, heat storage agents, heat stabilizers, antibacterial agents, lubricants, pigments, and dyes.

[0019] The false twisting device used to produce the highly stretchable, extendable false-twisted yarn of the present invention is not particularly limited, and any conventionally known device may be used, such as a multi-axis circumscribing type, an inscribing type, a pin type, or a belt type. The pin type is particularly preferred because it is more likely to achieve high stretchability and extensibility. Furthermore, a draw false-twisting machine generally has two heating zones: a first heater installed in the twisting zone, and a second heater installed downstream of the false-twisting device. Both heaters use a heat medium or an electric heating system. The second heater is not necessarily required to produce the highly stretchable, extendable false-twisted yarn of the present invention, but if a second heater is used, it is desirable to set the second heater temperature to a low temperature between room temperature and the glass transition temperature. Since the yarn is generally heat-treated by overfeeding, a non-contact hollow pipe heater is preferably used as the second heater.

[0020] In the first heater, the yarn is twisted and heat-set while being drawn, so the yarn temperature is set within a range from the glass transition temperature to the melting point, specifically within a range of 80 to 220°C, more preferably within a range of 160 to 210°C, and even more preferably within a range of 180 to 210°C. The first heater may be either a non-contact type or a contact type, but a non-contact type is preferably used from the viewpoint of machine maintenance. Needless to say, the values ​​given above as the appropriate temperature range are the yarn temperature and are different from the heater set temperature.

[0021] The false twisting device is not particularly limited as described above, and the false twisting operation speed also varies depending on the device. For example, for pin-type devices, the speed is generally about 80 to 150 m / min, for belt-type devices about 350 to 800 m / min, and for friction disk-type devices about 400 to 1000 m / min, and can be selected appropriately depending on the type of draw false twisting machine. The false-twisted yarn is wound onto a paper tube by a winder, and either a straight wind or a biconical wind package shape can be used. When winding onto the paper tube, it is preferable to attach a tail (tail yarn) in order to carry out continuous operation from the next process onwards.

[0022] The blending ratio of the highly stretchable false-twisted yarn in the design constituting one side of the knitted fabric of the present invention is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 70% by mass or more, and particularly preferably 100% by mass. When the highly stretchable false-twisted yarn is present at a blending ratio above the above range, the knit loops appear smaller and the gaps become smaller, which tends to improve snag resistance. On the other hand, when the blending ratio is below the above range, the tightness of the knit loops and tucks weakens, which tends to reduce snag resistance. In a double knit where the highly stretchable false-twisted yarn is knitted to form the design on both sides, for convenience, the weight of the highly stretchable false-twisted yarn constituting one side is calculated by multiplying the weight of the continuous highly stretchable false-twisted yarn sufficient to constitute 100W on one side by the ratio of the number of knit loops on one side to the number of knit loops constituting the other side.

[0023] The knitted fabric of the present invention may contain other yarns in addition to the highly stretchable false-twisted yarn described above, as long as the objective is achieved. The other yarns may include synthetic fibers such as polyester fibers, polyamide fibers such as nylon 6 and nylon 66, acrylic fibers, acrylate fibers, and olefin fibers such as polypropylene, biodegradable fibers such as polylactic acid fibers, regenerated fibers such as rayon and lyocell, and known natural fibers such as cotton, linen, and wool. Examples of the other yarn form include filament yarn and spun yarn, with filament yarn being preferred and multifilament yarn being more preferred. Examples of filament yarn include processed yarns such as flat yarn (raw silk), false-twisted yarn, and air-entangled yarn, but false-twisted yarn is preferred in order to prevent a decrease in the snag resistance of the knitted fabric of the present invention.

[0024] The knitted fabric of the present invention is suitable for use in uniforms for working purposes, etc., and can contain antistatic yarn to meet the antistatic function often required for working purposes. Since antistatic yarns are often colored, such as gray, and therefore conspicuous, it is preferable to design the fabric so that they are not visible from the surface. In the case of single knitting, antistatic yarns may be used as the core yarn of a core-sheath composite yarn, or the antistatic yarn may be placed on the back side of the knitted fabric by plating knitting. In the case of double knitting, antistatic yarns may be used in the weave that constitutes the other side of the knitted fabric. Specifically, the antistatic yarn may be aligned and inserted into a portion of the weave when knitting the back side weave, or a weave that is previously combined with the yarn that constitutes the weave may be knitted. Incidentally, placing antistatic yarn in a portion of the back weave and in a portion of the connection with the front weave is preferable because it enhances the antistatic properties of the surface. In the present invention, it is preferable to connect the knit tuck portion on the surface to the front weave by tucks using a connecting yarn containing antistatic yarn. In the knit tuck structure portion of the present invention, the tuck yarns constituting the face structure are combined with the knit loops to give the fabric a thick appearance, which has the advantage that the antistatic yarns can be easily hidden even when connecting tucks are added.

[0025] Furthermore, in order to impart sufficient antistatic performance to the knitted fabric of the present invention, it is preferable that the yarns containing antistatic yarns are arranged at a spacing of at least one yarn per inch in the wale direction. That is, it is preferable that the antistatic yarns are knitted at intervals of 1 inch or less in the warp direction. It is preferable that the antistatic yarns are those in which conductive fine particles are kneaded into the fibers. Specifically, they may be conductive fibers (single-component system) formed from a fiber-forming resin such as polyester resin or polyamide resin (conductive resin) in which a conductive material is kneaded into the fiber-forming resin, or conductive fibers (composite-component system) formed from a conductive resin and a non-conductive resin. Examples of conductive materials include conductive carbon black; simple metals such as silver, nickel, copper, iron, and tin; and metal compounds such as copper sulfide, zinc sulfide, and copper iodide. To achieve excellent antistatic performance both initially and after washing, the electrical resistance of the antistatic yarn should be 10 2 ~10 9Examples of antistatic yarns include "Clacarbo" manufactured by Kuraray Trading Co., Ltd., "Belltron" manufactured by KB Seiren Co., Ltd., "Luana" manufactured by Toray Industries, Inc., and "Emina White" manufactured by Toyobo Co., Ltd.

[0026] Next, the structure of the knitted fabric of the present invention will be described in detail, including an explanation of the knit tuck unit structure. First, with reference to Figure 2(a), a method for calculating the ratio of knit tuck unit structures to the total structure of the entire knitted fabric structure will be explained. The structure of Figure 2(a) is a structure in which the knitting yarn forms loops on both the front and back sides, with (1), (2), (3), (5), and (6) being knit loops, (4) being a welt, and (7) being a tuck. In other words, the structure of Figure 2(a) has five knit loops, one welt, and one tuck, for a total of seven loops, welts, and tucks.

[0027] Note that needles in the process of moving from the cylinder needle to the dial needle of the knitting machine, or from the dial needle to the cylinder needle, are not counted as welts. For example, (8) in Figure 2(a) is the yarn moving from the cylinder to the dial, and (9) is the yarn moving from the dial to the cylinder, so they are not counted as welts. Also, referring to Figure 5, there are tucks in the structure of yarn feeders F1 and F4, but these tucks connect the structure of one surface with the structure of the other surface, and do not constitute the structure of the surface, so such tucks are not counted as part of the structure that makes up the surface.

[0028] In the present invention, the ratio of knit tuck unit structures on one side of a knitted fabric can be calculated as a percentage by dividing the number of knit tuck unit structures present in the structure on one side of the knitted fabric by the total number of knit loops, welts, and tucks present in the structure on that side. In this calculation, each knit tuck unit structure is counted as two (one knit and one tuck). For example, the knit structure shown in FIG. 2(a) includes a pair of knit tuck structures (6) and (7), so the number is counted as two. Therefore, if the cylinder side of the structure shown in FIG. 2(a) is considered to be one side, the ratio of knit tuck unit structures on the cylinder surface is 2 / 3 when considering only yarn feeder b, resulting in a composition ratio of approximately 66.7%. Furthermore, the knit structure shown in FIG. 2(b) has two pairs of knit tuck basic structures, which are calculated as four in total, consisting of two knit loops and two tucks. Therefore, the ratio of knit tuck unit structures is 4 / 4, resulting in a composition ratio of 100%.

[0029] The knitted fabric of the present invention has knit-tuck unit structures made of highly stretchable false-twisted yarn on at least one surface, and the ratio of knit-tuck unit structures made of highly stretchable false-twisted yarn to the entire structure making up that one surface must be 25 to 100%. As described above, a knit-tuck unit structure is a knitting structure in which knit loops and tucks are connected, and a knit and a tuck are overlapped between adjacent yarns in the course direction. The presence of many such structures at uniform intervals on the knitted surface enhances the snag resistance of the present invention. The ratio of knit-tuck unit structures made of highly stretchable false-twisted yarn on one surface is preferably 30% or more, more preferably 40% or more, even more preferably 50% or more, even more preferably 60% or more, and particularly preferably 100%. If the ratio of knit-tuck unit structures made of highly stretchable false-twisted yarn on one surface is less than the above range, the number of tight knit portions that form convex portions on the knitted surface will be reduced, making the knitted surface more susceptible to snagging and reducing snag resistance.

[0030] As mentioned above, it is preferable that the knit-tuck unit structure exists on one side as a repeat of knit and tuck in the course direction corresponding to the longitudinal direction of the knitted fabric. In this structure, all knit loops are tucked, which increases the number of tight knit loops. In the structure constituting one side, the knit-tuck unit structure preferably accounts for a constituent ratio of 40% or more, more preferably 45 to 100%. If the constituent ratio is less than the above range, the repeating knit-tuck structure becomes less, which tends to reduce the effect of improving snag resistance.

[0031] The knit-tuck unit structures in the design constituting one side of the knitted fabric of the present invention may include those composed of yarns other than the highly stretchable, elongated false-twisted yarn. However, the proportion of knit-tuck unit structures composed of the highly stretchable, elongated false-twisted yarn in the aggregate of knit-tuck unit structures is preferably 40% or more. More preferably, it is 50% or more, even more preferably 60% or more, even more preferably 70% or more, and particularly preferably 100%. As described above, the highly stretchable, elongated false-twisted yarn shrinks significantly during processing and develops crimp. This reduces the apparent size of the knit loops, reducing gaps and improving snag resistance. Note that when the content of the highly stretchable, elongated false-twisted yarn in one side is high, sufficient snag resistance is likely to be obtained even if the proportion of knit-tuck unit structures composed of the highly stretchable, elongated false-twisted yarn is 60% or less.

[0032] The course density on one side of the knitted fabric of the present invention is preferably 50 (units / 2.54 cm) or more and 95 (units / 2.54 cm) or less. It is more preferably 55 (units / 2.54 cm) or more, and even more preferably 60 (units / 2.54 cm) or more. It is more preferably 90 (units / 2.54 cm) or less, and even more preferably 85 (units / 2.54 cm) or less. If the course density is below the above range, it may be difficult to improve snag resistance. On the other hand, if the course density exceeds the above range, it may be difficult to improve the feel and stretchability may not be maintained.

[0033] The wale density on one side of the knitted fabric of the present invention is preferably 45 (units / 2.54 cm) or more and 80 (units / 2.54 cm) or less. It is more preferably 48 (units / 2.54 cm) or more, and even more preferably 50 (units / 2.54 cm) or more. It is more preferably 75 (units / 2.54 cm) or less, and even more preferably 70 (units / 2.54 cm) or less. If the wale density is below the above range, it may be difficult to improve snag resistance. On the other hand, if the wale density exceeds the above range, it may be difficult to improve the feel and stretchability may not be maintained.

[0034] The knitting machine used to manufacture the knitted fabric of the present invention is preferably a single or double knit knitting machine with a needle density (gauge) on the needle bed of 30 or more per inch (2.54 cm). The knitting machine gauge is preferably 30 to 50 needles / 2.54 cm. If the knitting machine gauge exceeds 50 needles / 2.54 cm, the stretchability tends to decrease, making it necessary to use thinner yarns, and the strength of the knitted fabric also tends to decrease. On the other hand, if the knitting machine gauge is less than 30 needles / 2.54 cm, the density is too low and the snag resistance tends to decrease.

[0035] The yarn length of the yarn forming the knit-tuck of the knitted fabric of the present invention is preferably 80 mm / 100W or more and 300 mm / 100W or less. If the yarn length is less than 80 mm / 100W, stable production may be difficult and knitting defects may not be reduced. On the other hand, if it exceeds 300 mm / 100W, it may not be possible to control the size of the knit loop and prevent a decrease in snag resistance. When multiple types of yarn are used to form the knit-tuck, the arithmetic average of the yarn lengths of the multiple structures and yarn types is considered to be the yarn length.

[0036] In the present invention, it is also a preferred embodiment that the yarn used to knit the front and / or back courses of the yarn used to knit the knit tuck is structured as an all-knit unit. Combining knit-tuck and all-knit in the wale direction before and after the knitting order facilitates a denser knitted fabric. As the knitted fabric becomes denser, stretchability tends to decrease, but it contributes to improved snag resistance. The yarn length of the yarn forming the all-knit is preferably 120 mm / 100 W or more and 350 mm / 100 W or less. If the yarn length is less than 120 mm / 100 W, stable production is difficult and knitting defects may not be reduced. On the other hand, if the yarn length exceeds 350 mm / 100 W, it becomes difficult to prevent a decrease in the snag resistance of the knitted fabric. When multiple types or strands of other yarns are used, the arithmetic average value of the other yarns is used as the yarn length of the other yarns. In addition, when multiple types of highly stretchable, elongated, false-twisted yarns or other yarns are used, the yarn length is measured for each feeder, and the arithmetic average of the yarn lengths of yarns having the same unit structure is used.

[0037] The yarns constituting the above knit-tuck structure and all-knit structure are preferably composed solely of highly stretchable elongated false-twisted yarns, but they do not necessarily have to be composed solely of highly stretchable elongated false-twisted yarns, and other yarns may be used as part of the yarns constituting the knit-tuck structure or all-knit structure.

[0038] The knitted fabric of the present invention has a basis weight of 100 g / m 2 More than 250g / m 2 It is preferably 120 g / m or less. 2 More preferably, it is 220 g / m 2 If the basis weight is less than the above range, it may not be possible to improve the density of the knitted fabric, and it may not be possible to improve the firmness and stiffness and reduce the occurrence of runs. On the other hand, if the basis weight exceeds the above range, it may not be possible to improve productivity. The basis weight can be measured by the method described in the Examples below.

[0039] The elongation percentage in the weft direction of the knitted fabric of the present invention is preferably 25% or more and 100% or less, more preferably 85% or less, and even more preferably 70% or less. If the elongation percentage in the weft direction exceeds the above range, run-out may occur more easily, making it difficult to prevent a decrease in snag resistance. On the other hand, if the elongation percentage in the weft direction is less than the above range, it is difficult to say that the knitted fabric has high stretchability.

[0040] The sewn product tends to have a better core quality when the elongation rate in the warp direction is kept slightly lower than that in the weft direction. Therefore, the elongation rate in the warp direction of the knitted fabric of the present invention is preferably 20% or more and 80% or less, more preferably 70% or less, and even more preferably 50% or less. If the elongation rate in the warp direction exceeds the above range, sewing may become difficult. On the other hand, if the elongation rate in the warp direction is less than the above range, the comfort of the product may decrease. The elongation rates in the warp and weft directions can be measured by the method described in the examples below.

[0041] To keep the elongation of the knitted fabric low as described above, it is preferable to fully express the crimp of the false-twisted yarn during dyeing and processing, entangle the knitted loops made of the bulky yarn, and then heat-set the knitted fabric using a stronger heat treatment. This heat-set is preferably carried out at 180°C or higher in dry heat or 120°C or higher in wet heat, and more preferably at 190-210°C in dry heat or 125-135°C in wet heat. Specifically, the grey fabric is subjected to a continuous relaxation process using a relaxer or the like to increase the crimp, and then the stronger heat-set is carried out. Furthermore, in order to reduce the elongation of the knitted fabric in the weft direction and adjust the balance of the elongation in the warp and weft directions, it is also preferable to finish the knitted fabric by slightly stretching the weft direction compared to the warp direction, resulting in a longer weft length of the knitted loops.

[0042] The knitted fabric of the present invention can satisfy the snag resistance performance of grade 4 or higher, and even grade 4.5 or higher, according to the D-1 method (damage bar method) of JIS-L1058.

[0043] In the case of double knitting, the knitted fabric of the present invention has the above-mentioned structure, so that the connecting yarn is easily hidden from one side, and even if a colored antistatic yarn is used as the connecting yarn, the presence of the antistatic yarn on the surface (one side) can be made inconspicuous. Therefore, the knitted fabric of the present invention can be suitably used for antistatic work clothes such as working uniforms.

[0044] The knitted fabric of the present invention has both stretchability and snag resistance, and is therefore suitable for outerwear such as work shirts, pants, jackets, etc. In particular, it is ideal as a knitted fabric for uniforms for working, etc., which allow comfortable movement. [Example]

[0045] The effects of the present invention will be specifically demonstrated below using examples, but the present invention is not limited to the following examples and can be practiced by making appropriate modifications within the scope that conforms to the spirit of the present invention.

[0046] <Total yarn size, number of filaments, single yarn size> The total fineness of the yarn was measured and converted to decitex (dtex) based on the Fineness (Total Fineness) Method A of JIS-L1013:2010 8.3. The number of filaments was measured based on JIS-L1013:2010 8.4, and the single yarn fineness was calculated by dividing the total fineness by the number of filaments.

[0047] <Stretchability of thread (%)> Measured based on JIS-L1013:2010 8.11 Elasticity Method C. As a pretreatment, the skein was wrapped in gauze and treated with hot water at 90°C for 20 minutes.

[0048] <Dimensional change rate of thread in hot water> Measurement was performed based on JIS-L1013:2010 8.18.1 Hot water dimensional change rate (method A). The treatment conditions were 100°C x 30 minutes.

[0049] <Average yarn length for knitting> The stitch length was measured based on JIS-L1096:2010 8.8 Stitch Length. Specifically, for each type of yarn constituting the knitted structure, the measurement section was set to 100 stitches (100 wales), and the average yarn length of each yarn was calculated by dividing the length of the yarn when the initial load was applied after unraveling the yarn in the measurement section by 100. However, in the case of filament yarn, the initial load specified in JIS-L1013 5.1 (Initial Load) was used, and in the case of spun yarn, the initial load specified in JIS-L1095:6.1 (Initial Load) was used.

[0050] <Elongation rate of knitted fabric (%)> Measurement was performed based on JIS-L1096:2010 8.16 B method (constant load), with a load of 490cN.

[0051] <Count of knitted fabric> The weight of the knitted fabric was measured based on the mass per unit area under standard conditions according to JIS-L1096:2010 8.3.2 Method A.

[0052] <Knit density> Based on JIS-L1096:2010 8.6.2 knitting density, the number of courses (number / 2.54cm) and the number of wales (number / 2.54cm) on one side of the knitting fabric were measured. The number of wales and the number of courses refer to the number of wales per inch in the horizontal direction and the number of courses per inch in the vertical direction of the knitting fabric.

[0053] <Snag resistance> The snag rating of the outer surface of the knitted fabric was determined based on the D-1 method of JIS-L1058:2011 7.3.

[0054] <Antistatic yarn is less noticeable> The finished knitted product (sax color) with antistatic yarn on the back was cut into a 15cm square and attached to the center of a white mount, and the mount was then propped up against the observation plate of an observation device for determining wrinkles after washing in JIS-L1096 8.24, and the inconspicuousness of the antistatic yarn was judged at a distance of 122cm from the observation plate. A four-level evaluation was made: ◎ (almost invisible), ○ (faintly visible), △ (visible), and × (not noticeable).

[0055] <Frictional electrification voltage> The fabric was washed 10 times according to the JIS-L1096-C4M method and then dried, and the frictional electrification voltage was measured according to JIS-L1094:2014 7.2B method (frictional electrification voltage measurement method). However, the friction surface was the technical back (front reed side).

[0056] Example 1 A 30-inch, 36-gauge single-use circular knitting machine (JS type, manufactured by Fukuhara Seiki Seisakusho) was used to knit a greige knit consisting of a repeat of the complete structures F1 and F2 shown in Figure 3. A pin-twisted circular cross-section fiber of 84 dtex (T), 48 filaments (f) consisting of a side-by-side cross-section conjugate fiber of polybutylene terephthalate (50% by mass) and polyethylene terephthalate (50% by mass) was used as a highly stretchable, elongated false-twisted yarn for all yarn feeders. The stretch elongation of this highly stretchable, elongated false-twisted yarn was 91.6%, the dimensional change in hot water was -7.8%, and the yarn length at each yarn feeder was 175 mm / 100 wales (W).

[0057] The finished grey fabric was opened and continuously scoured according to the following recipe 1, and then dyed according to the following recipe 2, followed by finishing. Formulation 1 (scouring formulation): An open soaper type continuous scouring machine was used, along with 1 g / l of Nonisole N manufactured by Satoda Kako Co., Ltd., 0.5 g / l of Neocrystal CG1000 manufactured by Nicca Chemical Co., Ltd., and 0.5 g / l of soda ash, and the bath temperature in the cleaning tank was changed from 60°C to 80°C to 80°C.

[0058] Formulation 2 (dyeing formulation): Using a Hisaka Seisakusho NS-type liquid jet dyeing machine, the fabric was dyed in a saxophone color at high pressure at 130°C using a bath ratio of 1:15, 130°C x 45 minutes, 0.2 g / L acetic acid, pH = 4, 0.5 g / L Disper N700 manufactured by Meisei Chemical Industry Co., Ltd., 0.5 g / L Neocrystal GC1000 manufactured by Nicca Chemical Co., Ltd., 1.5% owf SR1800 manufactured by Takamatsu Oil Co., Ltd., and 0.3% owf disperse dye (CI Disperse Blue 56), followed by washing, centrifugal dehydration, and drying at 120°C in the usual manner.

[0059] Next, 1% ows (on the weight of solution) of Sunstat ES-11, an antistatic agent manufactured by Sanyo Chemical Industries, Ltd., was applied as a finishing agent. The pick-up of the finishing agent was 70%. The final setting was then performed using a pin tenter at 170°C for 120 seconds to adjust the strength and obtain a final knitted fabric. The finishing was performed without widening the fabric as much as possible to remove wrinkles, and without pulling it in the warp direction. The structure of the knitted fabric in Example 1 and the evaluation results are shown in Table 1.

[0060] Example 2 The same knitting structure as in Example 1 was performed using the same single circular knitting machine as in Example 1, with the same knitting pattern as in Figure 3. At this time, yarn feeder F1 was knitted at a yarn length of 175 mm / 100 W using the same high-stretch, elongated false-twisted yarn as in Example 1, and yarn feeder F2 was knitted at a yarn length of 175 mm / 100 W using a false-twisted yarn (31.3% stretch elongation, -4.1% hot water dimensional change rate) (hereinafter referred to as "friction false-twisted yarn") that had been false-twisted using a friction false-twisting machine with a semi-dull circular cross section. The finished greige knit was dyed and finished in the same manner as in Example 1. The blend ratio of the high-stretch, elongated false-twisted yarn in the knitted fabric was 50% by mass, and the blend ratio of the friction false-twisted yarn was 50% by mass. The structure of the knitted fabric in Example 2 and the evaluation results are shown in Table 1.

[0061] Example 3 A grey knitting machine with a knitting structure consisting of complete structures F1 to F4 shown in Figure 4 was produced using the same single circular knitting machine (JS type manufactured by Fukuhara Seiki Seisakusho) as in Example 1. The same highly stretchable false-twisted yarn as in Example 1 was used for all yarn feeders F1 to F4. The yarn length for yarn feeders F1 and F3 was 170 mm / 100W. The yarn length for yarn feeders F2 and F4 was 230 mm / 100W. The completed grey knitting machine was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Example 3 and the evaluation results are shown in Table 1.

[0062] Example 4 The same knitting structure as in Example 3 was produced using the same single circular knitting machine as in Example 1. The same highly stretchable, elongated false-twisted yarn as in Example 1 was used in yarn feeders F1 and F3, and knitting was performed at a yarn length of 170 mm / 100 W. Next, the same polyethylene terephthalate friction false-twisted yarn as in Example 2 was used in yarn feeders F2 and F4, and knitting was performed at a yarn length of 230 mm / 100 W. The blend ratio of the highly stretchable, elongated false-twisted yarn in the knitted fabric was 40% by mass, and the blend ratio of the friction false-twisted yarn was 60% by mass. The finished grey fabric was dyed and finished in the same manner as in Example 3. The structure of the knitted fabric of Example 4 and the evaluation results are shown in Table 1.

[0063] Example 5 A 33-inch, 32-gauge double circular knitting machine (LPJ model, manufactured by Fukuhara Seiki Seisakusho) was used to knit a greige fabric consisting of complete designs F1 to F6 shown in Figure 5 using interlock gauging. A semi-dull, round cross-section, 56T24f polyethylene terephthalate friction false-twist yarn (stretching elongation: 28.9%, hot water dimensional change: -3.5%) was used as the yarn forming the design on the other side of yarn feeders F1 and F4 and connecting the front and back sides with tucks. Next, the same 84T48f highly stretchable, elongated false-twisted yarn used in Example 1 was used as the yarn forming the design on one side of yarn feeders F2 and F5. Furthermore, another highly stretchable, elongated false-twisted yarn, a 56T36f pin-twisted round cross-section fiber consisting of a side-by-side cross-section conjugate fiber of polybutylene terephthalate (50% by mass) and polyethylene terephthalate (50% by mass), was used as the yarn forming the design on one side of yarn feeders F3 and F6. The stretch elongation rate of this highly stretchable false-twisted yarn was 87.5%, and the hot water dimensional change rate was -9.9%. The yarn lengths of F1 and F4 were 200 mm / 100W, those of F2 and F5 were 210 mm / 100W, and those of F3 and F6 were 155 mm / 100W. The blend ratio of 84T48f highly stretchable false-twisted yarn in the knitted fabric was 47% by mass, that of 56T36f highly stretchable false-twisted yarn was 23% by mass, and that of 56T24f friction false-twisted yarn was 30% by mass. The finished grey fabric was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Example 5 and the evaluation results are shown in Table 1.

[0064] Example 6 A grey fabric was knitted by interlacing an antistatic yarn at 15 mm intervals in the warp direction of the back fabric of Example 5. Specifically, the complete fabric shown in Figure 5 was knitted once per 12 repeats by aligning a 22T1f antistatic yarn (White Belltron B68 manufactured by KB Seiren) with the F1 yarn at the yarn feeder F1. The completed grey fabric was dyed and finished in the same manner as in Example 5. The structure of the knitted fabric of Example 6 and the evaluation results are shown in Table 1.

[0065] Example 7 As in Example 1, a 30-inch, 36-gauge single circular knitting machine was used to knit a greige fabric consisting of the complete structures F1 and F2 shown in Figure 3. The yarn used was a highly stretchable false-twisted yarn, a semi-dull circular cross section 84T24f pin-twisted yarn of polybutylene terephthalate (stretching elongation 55.6%, hot water dimensional change rate -5.4%), knitted at a yarn length of 175 mm / 100 W. The finished greige fabric was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Example 7 and the evaluation results are shown in Table 1.

[0066] (Comparative Example 1) As in Example 1, a 30-inch, 36-gauge single circular knitting machine was used to knit a greige fabric consisting of the complete designs F1 and F2 shown in Figure 3. Instead of the highly stretchable false-twisted yarn, the yarn used was the 84T36f friction false-twisted yarn with a semi-dull circular cross section that was interknitted in Example 2 (stretch elongation rate 31.3%, hot water dimensional change rate -4.1%), knitted at a yarn length of 175 mm / 100 W. The completed greige fabric was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Comparative Example 1 and the evaluation results are shown in Table 1.

[0067] (Comparative Example 2) As in Example 6, a 30-inch, 32-gauge double circular knitting machine was used to knit a greige knitting machine consisting of complete designs F1 to F6 shown in Figure 5. In this knitting, no highly stretchable false-twisted yarn was used in yarn feeders F2, F3, F5, and F6. Instead, the same friction false-twisted yarn as used in yarn feeder F2 in Example 2 was used in F2 and F5. The same 56T24f friction false-twisted yarn as used in yarn feeder F1 and F4 was used in F3 and F6. As in Example 6, a 22T1f antistatic yarn (White Belltron B68, manufactured by KB Seiren) was knitted into yarn feeder F1 once per 12 repeats of the complete design. The completed greige knitting machine was dyed and finished in the same manner as in Example 6. The structure of the knitted fabric of Comparative Example 2 and the evaluation results are shown in Table 1.

[0068] (Comparative Example 3) Using the same 30-inch, 36-gauge single circular knitting machine as in Example 1, a greige machine with an all-knit complete design as shown in Figure 6 was knitted. The same 84T48f highly stretchable, elongated false-twisted yarn as in Example 1 was used for all yarn feeders. The yarn length at each yarn feeder was 260 mm / 100 wales (W). The completed greige machine was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Comparative Example 3 and the evaluation results are shown in Table 1.

[0069] Comparative Example 4 Using the same 30-inch, 36-gauge single circular knitting machine as in Example 1, a greige machine with an all-knit complete design as shown in Figure 6 was knitted in the same manner as in Comparative Example 3. Instead of the highly stretchable false-twisted yarn, the same 84T36f friction false-twisted yarn as the yarn used in yarn feeder F2 in Example 2 was used. The finished greige machine was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric of Comparative Example 4 and the evaluation results are shown in Table 1.

[0070] [Table 1]

[0071] As can be seen from Table 1, the knitted fabrics of Examples 1 to 7 exhibited excellent stretchability and anti-snag properties because the ratio of knit-tuck unit structures composed of highly stretchable, elongated false-twisted yarns on one side was within the range of the present invention. On the other hand, Comparative Examples 1 and 2 had knit-tuck unit structures but were not composed of highly stretchable, elongated false-twisted yarns, and Comparative Examples 3 and 4 did not have knit-tuck unit structures at all, so although they had stretchability, they had poor anti-snag properties on one side. Furthermore, when an antistatic yarn was included, the presence of the antistatic yarn was less noticeable in the knitted fabric of Example 6 than in Comparative Example 2. [Industrial Applicability]

[0072] According to the present invention, it is possible to provide a knitted fabric that is suitable for clothing such as working uniforms, which has both stretchability and snag resistance. Furthermore, it is possible to provide a knitted fabric that is difficult to see through even when colored antistatic yarn is used. Therefore, the present invention is extremely useful in industries that manufacture and sell such clothing.

Claims

1. The knitted fabric is a single knit having knit-tuck unit structures on at least one surface thereof, at least a part of which is made of false-twisted yarn having a stretch elongation rate of 40 to 95%, and the ratio of knit-tuck unit structures made of false-twisted yarn having a stretch elongation rate of 40 to 95% to the entire structure constituting said one surface is 25% or more and less than 100%, and at least one surface contains both knit-tuck unit structures and all-knit unit structures.

2. 2. The knitted fabric according to claim 1, wherein the false twist yarn having a stretch elongation rate of 40 to 95% is made of conjugate composite fiber.

3. 2. The knitted fabric according to claim 1, characterized in that the course density on said one surface is 50 (pieces / 2.54 cm) or more and 95 (pieces / 2.54 cm) or less, and the wale density is 45 (pieces / 2.54 cm) or more and 80 (pieces / 2.54 cm) or less.

4. The knitted fabric according to claim 2, characterized in that the conjugate composite fiber is made of polybutylene terephthalate and polyethylene terephthalate, and knit-tuck unit structures made up of false-twisted yarns of the conjugate composite fiber constitute 40 to 100% of the structure that constitutes one side.

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