Snag-resistant knitted fabric

Abstract

To provide a knitted fabric having anti-snagging properties and elasticity required for uniform and others.SOLUTION: A knitted fabric is formed of a single knitted fabric or a double 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 the stretch elongation rate. A ratio of the knit-tack unit structure constituted of the false-twisted yarn having 40 to 95% of the 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, which is suitable for use in clothing such as working uniforms. [Background technology]

[0002] Knitted fabrics have superior characteristics such as a soft feel and stretchability compared to woven fabrics, and are therefore widely used for innerwear, sportswear, etc. However, compared to woven fabrics, knitted fabrics tend to have poorer performance in terms of pilling, snagging, and abrasion resistance, making them difficult to use as uniform materials for working, 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 constituting the knitted fabric has been proposed to increase the binding force of the yarns appearing on the surface of the knitted fabric (see Patent Document 1). However, the knitted fabric obtained by this method has a problem in that it loses 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 intertwining a doubling 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). According to this method, a knitted fabric with sufficient snag resistance can be obtained, but it is necessary to produce separate false-twisted yarns in the S direction and the Z direction and then intertwine the doubling, which makes the manufacturing process complicated and involves troublesome work, making it economically disadvantageous.

[0005] Also, as a knitted fabric having stretchability and anti-snag properties, excellent firmness and a soft feel, a knitted fabric containing a composite false-twisted yarn consisting of yarns containing a conjugate false-twisted yarn A and a non-conjugate false-twisted yarn B, 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 process of using both the conjugate false-twisted yarn and the non-conjugate false-twisted yarn and strongly entangling them, which makes the manufacturing process complicated and involves troublesome work, making it economically disadvantageous. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2003-247149 A [Patent Document 2] WO2008 / 001920 publication [Patent Document 3] JP 2022-166393 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been devised to solve the above-mentioned problems of the conventional technology, and its object is to provide a knitted fabric that has both anti-snag properties 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] Conventionally, it was thought that in a knitted fabric consisting of knit, tuck, and welt, the use of many tucks would cause a large change in the size of the knit loops in the knitted fabric, which would increase the unevenness of the knitted fabric surface, making the knitted fabric surface more likely to get caught and more likely to cause snagging. However, as a result of intensive research by the present inventors, it was discovered that by using a specific false-twist yarn with a high stretch elongation rate and giving the knitted fabric surface a structure of knit tuck basic units, it is possible to achieve high anti-snag properties that were not previously thought possible while still maintaining stretchability, and this led to the completion of the present invention.

[0009] That is, the present invention has the following configurations (1) to (6). (1) A knitted fabric consisting of a single knit or double knit having a knit-tuck unit structure on at least one surface thereof, wherein at least a portion of the knit-tuck unit structure is made of a false-twisted yarn having a stretchability of 40 to 95%, and the ratio of knit-tuck unit structures made of false-twisted yarn having a stretchability of 40 to 95% to the entire structure constituting said one surface is 25 to 100%. (2) The knitted fabric according to (1), wherein the false twist yarn having a stretch elongation rate of 40 to 95% is made of a conjugate composite fiber. (3) The knitted fabric 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 described in (1), characterized in that at least one surface includes both knit-tuck unit structures and all-knit unit structures. (5) The knitted fabric according to (2), characterized in that the conjugate composite fiber is made of polybutylene terephthalate and polyethylene terephthalate, and a knit-tuck unit structure composed of a false twist yarn of the conjugate composite fiber constitutes 40 to 100% of the structure constituting one side. (6) The knitted fabric is a double knit, and the structure constituting the other surface has an electrical resistance value of 10 2 ~10 9The knitted fabric according to any one of (1) to (5), comprising an antistatic yarn having a resistance of Ω / cm, and the knitted fabric has a frictional electrification voltage of 900 V or less. Effect 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 description of the drawings]

[0011] [Figure 1] FIG. 1 is a stitch configuration diagram consisting of only knit-tuck unit structures. [Diagram 2] 2(a) and (b) are knitting structure diagrams for explaining the knit-tuck unit structure and how to count the numbers of knit loops, tuck loops, and welts. [Diagram 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. [Diagram 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 PREFERRED EMBODIMENTS

[0012] The knitted fabric of the present invention is knitted on a knitting machine having 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 the sake of convenience, in this invention, they are referred to as one side and the other side, and the side assumed to be used as the front side of the final product is referred to as one side.

[0013] The knitted fabric of the present invention is characterized in that at least one surface of the knitted fabric has a knit-tuck unit structure (hereinafter also referred to as "knit-tuck basic structure" or "knit-tuck repeat structure") composed of a false twist yarn with an elastic stretch rate of 40 to 95% (hereinafter also referred to as a highly elastic false twist yarn). An example of the knit-tuck unit structure is shown in FIG. 1. FIG. 1 is a stitch configuration diagram consisting of only knit-tuck unit structures. When the surface of one side of the knitted fabric comes into contact with something, the upper side of the knit loop becomes a convex part of the knitted fabric surface, so that it is likely to get caught there. However, in the knit-tuck unit structure, the part where the tuck yarn of the previous course and the apex of the knit loop meet (the part indicated by the arrow in FIG. 1), the tuck of the previous course and the apex of the knit loop, and the sinker loop of the next course meet, become a convex part of the knitted fabric surface. At this time, if the knit loop is sufficiently small, the yarns of each other will restrain each other, making it difficult to pull out the fibers. 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, which shrinks significantly during processing and develops crimp, making the size of the knit loop smaller and tighter, making it difficult for the fibers to be pulled out. This is thought to improve the snag resistance in the present invention. In other words, a false-twisted yarn with a high stretch and elongation rate develops very high crimp, but the apparent yarn shrinks significantly due to the development of crimp, so the knitted fabric shrinks and the knit loops become smaller. In addition, the yarn becomes bulky during dyeing processing, making the apparent thickness of the yarn larger, thereby reducing the gaps in the knit loops. It is thought that the smaller knit loops make the knitted fabric tighter, improving the snag resistance and also improving the anti-see-through properties.

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

[0015] The stretching extension rate 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 stretching extension rate is less than the above range, it becomes difficult to achieve both stretchability and snag resistance in the knitted fabric, and if it exceeds the above range, the stretchability is sufficient, but the quality and physical properties of the false-twisted yarn tend to become unstable, which leads to large 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 stretching extension rate within the above range, it is possible to impart appropriate stretchability, snag resistance, and even anti-see-through properties to the knitted fabric.

[0016] In the present invention, the hot water dimensional change rate of the highly stretchable false twist 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, the loop length of the knitted fabric is unlikely to be shortened by hot water treatment during processing, and one side is likely to be unlikely to have a dense structure. Therefore, it is 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. 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 twist yarn is preferably a conjugate composite fiber. A conjugate composite fiber is a fiber in which two or more types of resins are bonded together to form a single fiber. Examples of the composite fiber include composite fibers having a side-by-side structure, a core-sheath structure, and the like, which contain 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. In addition, 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 to have an eccentric arrangement of the core within the sheath in order to produce crimp. The cross-sectional shape of the fiber may be a circular cross section, an elliptical cross section, a polygonal cross section such as a triangular cross section or a rectangular cross section, or a hollow cross section. Of these, a circular cross section or an elliptical cross section is preferred, and a circular cross section is 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 and 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 the above range, the knitted fabric becomes too thin and difficult to use, and if it exceeds the above range, the knitted fabric becomes too heavy and thick and difficult to use. The single yarn fineness of the highly stretchable and 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 the above range, the yarn is easily caught and the anti-snag properties are easily reduced, and if it exceeds the above range, the texture is easily hard. The highly stretchable and 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 tool used in the production of the highly stretchable and extendable false-twisted yarn of the present invention is not particularly limited, and any of the conventionally known types such as a multi-axis circumscribing type, an inscribing type, a pin type, and a belt type may be used. In particular, the pin type is preferred because it is easy to obtain high stretchability and elongation. In addition, the stretch 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 tool. Both heaters are heat-transfer type or electric type, and it is not necessarily required to use the second heater to produce the highly stretchable and extendable false-twisted yarn of the present invention, but if the 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. The second heater is generally heat-treated by overfeeding the yarn, so it is preferable to adopt a non-contact hollow pipe heater.

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

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

[0022] The blending ratio of the highly elastic and elongated false-twisted yarn in the structure constituting one side of the knitted fabric of the present invention is preferably 40% by mass or more. More preferably, it is 50% by mass or more, even more preferably, 70% by mass or more, and particularly preferably, it is 100% by mass. When the highly elastic and elongated false-twisted yarn is present at a blending ratio of the above or more, the knit loops appear smaller and the gaps become smaller, which tends to improve the snag resistance. On the other hand, when the blending ratio is less than the above, the tightness of the knit loops and tucks becomes weak, which tends to reduce the snag resistance. In addition, when the highly elastic and elongated false-twisted yarn is knitted to form the structure of both one side and the other side in a double knit, the weight of the continuous highly elastic and elongated false-twisted yarn that constitutes 100W of one side is multiplied by the ratio of the number of knit loops on one side to the number of knit loops constituting the other side, and the weight of the highly elastic and elongated false-twisted yarn constituting one side is calculated for convenience.

[0023] The knitted fabric of the present invention may contain other yarns in addition to the highly stretchable and extendable false-twisted yarn described above, as long as the purpose 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, hemp, and wool. Examples of the form of the other yarn include filament yarns and spun yarns, with filament yarns being preferred, and multifilament yarns being more preferred. Examples of the filament yarns include yarn-processed yarns such as flat yarns (raw silk), false-twisted yarns, and air-entangled yarns, but false-twisted yarns are preferred in order to prevent the snag resistance of the knitted fabric of the present invention from decreasing.

[0024] The knitted fabric of the present invention is suitable for use in uniforms for working purposes, etc., and an antistatic yarn can be used to satisfy the antistatic function often required for working purposes. The antistatic yarn is colored gray or the like and is conspicuous, so it is preferable to devise a method to make it invisible from the surface of the knitted fabric. In the case of a single knit, an antistatic yarn may be used for the core yarn of a core-sheath composite yarn, or an antistatic yarn may be arranged on the back side of the knitted fabric by plating knitting. In the case of a double knit, an antistatic yarn may be used in the structure constituting the other side of the knitted fabric. Specifically, when knitting the structure on the back side, an antistatic yarn may be aligned and inserted in a part of the structure, or a yarn that is previously combined with the structure may be knitted. It is preferable to place an antistatic yarn in a part of the back structure and in a part of the connection with the front structure, because this enhances the antistatic properties of the surface. In the present invention, it is preferable to connect the knit tuck part on the surface to the front structure by tucks using a connecting yarn containing an antistatic yarn. In the knit tuck structure of the present invention, the tuck yarn constituting the front structure is combined with the knit loops to give the fabric a thick appearance, which has the advantage that the antistatic yarn can be easily hidden even when connecting tucks are added.

[0025] In addition, 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 1 / inch or more in the wale direction. In other words, it is preferable that the antistatic yarns are woven at intervals of 1 inch or less in the warp direction. It is preferable that the antistatic yarns are made by kneading conductive fine particles into the fibers, and specifically, they may be conductive fibers (single component system) formed of a conductive material kneaded into a fiber-forming resin such as polyester resin or polyamide resin (conductive resin), or conductive fibers (composite component system) formed of 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. In order to achieve excellent antistatic performance both initially and after washing, the electrical resistance value of the antistatic yarns is 10 2 ~10 9Examples of the antistatic yarn include "Curacarbo" manufactured by Kuraray Trading Co., Ltd., "Beltron" 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 together with an explanation of the knit tuck unit structure. First, with reference to Fig. 2(a), a method for calculating the ratio of the knit tuck unit structure to the entire structure of the entire knitted fabric will be explained. The structure of Fig. 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. That is, the structure of Fig. 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 not counted as a welt because the yarn is moving from the cylinder to the dial, and (9) is not counted as a welt because the yarn is moving from the dial to the cylinder. 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 side to the structure of the other side, and do not constitute the structure of the surface, so such tucks are not counted as part of the structure that constitutes 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 of the number of knit tuck unit structures present in the structure on one side of the knitted fabric divided by the total number of knit loops, welts, and tucks present in the structure on the other side. In this case, each knit tuck unit structure is counted as two (one knit and one tuck). For example, the knitted structure shown in FIG. 2(a) includes a pair of knit tuck structures (6) and (7), so the number is set to two. Therefore, if the cylinder side is assumed to be one side in the structure of FIG. 2(a), the ratio of knit tuck unit structures on the cylinder surface is 2 / 3 when only the yarn feeder b is considered, and the composition ratio is approximately 66.7%. In addition, in the knitted structure shown in FIG. 2(b), there are two pairs of knit tuck basic structures, and they are calculated as a total of four, consisting of two knit loops and two tucks, so the ratio of knit tuck unit structures is 4 / 4, and the composition ratio is 100%.

[0029] The knitted fabric of the present invention has a knit-tuck unit structure composed of a highly stretchable and elongated false-twisted yarn on at least one side, and the ratio of the knit-tuck unit structure composed of the highly stretchable and elongated false-twisted yarn to the entire structure constituting the one side must be 25 to 100%. The knit-tuck unit structure is a knitted structure in which knit loops and tucks are connected as described above, and is a structure in which knits and tucks are overlapped between adjacent yarns in the course direction. The presence of many such structures at uniform intervals on the knitted surface can improve the snag resistance of the present invention. The ratio of the knit-tuck unit structure composed of the highly stretchable and elongated false-twisted yarn on one side 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 the knit-tuck unit structure composed of the highly stretchable and elongated false-twisted yarn on one side is less than the above range, the number of tight knit parts that become convex parts on the knitted surface will be reduced, and snagging will occur more easily, resulting in a decrease in snag resistance.

[0030] As described above, it is preferable that the knit-tuck unit structure exists in a repeating knit and tuck pattern in the course direction corresponding to the longitudinal direction of the knitted fabric on one side. In this structure, all knit loops are tucked, so that the number of tight knit loops can be increased. In the structure constituting one side, the knit-tuck unit structure preferably constitutes 40% or more of the structure. More preferably, it is 45 to 100%. If the constituent ratio is less than the above range, the number of repeating knit-tuck structures is reduced, and the effect of improving snag resistance is likely to decrease.

[0031] The knit-tuck unit structure in the structure constituting one side of the knitted fabric of the present invention may include those composed of yarns other than the highly stretchable and elongated false-twisted yarn, but in the assembly of knit-tuck unit structures, the ratio of knit-tuck unit structures composed of highly stretchable and elongated false-twisted yarn 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 and elongated false-twisted yarn shrinks significantly during processing and develops shrinkage. This makes the knit loop appear smaller, reduces the gap, and tends to improve the snag resistance. Note that when the content of the highly stretchable and elongated false-twisted yarn on one side is high, sufficient snag resistance is likely to be obtained even if the ratio of knit-tuck unit structures composed of highly stretchable and 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 (pieces / 2.54 cm) or more and 95 (pieces / 2.54 cm) or less. More preferably, it is 55 (pieces / 2.54 cm) or more, and even more preferably, it is 60 (pieces / 2.54 cm) or more. Also, it is more preferably 90 (pieces / 2.54 cm) or less, and even more preferably, it is 85 (pieces / 2.54 cm) or less. If the course density is less than the above range, it may be difficult to improve the snag resistance. On the other hand, if the course density exceeds the above range, it may be difficult to improve the texture and it may be difficult to maintain the stretchability.

[0033] The wale density on one side of the knitted fabric of the present invention is preferably 45 (pieces / 2.54 cm) or more and 80 (pieces / 2.54 cm) or less. More preferably, it is 48 (pieces / 2.54 cm) or more, and even more preferably, it is 50 (pieces / 2.54 cm) or more. Also, it is more preferably 75 (pieces / 2.54 cm) or less, and even more preferably, it is 70 (pieces / 2.54 cm) or less. If the wale density is below the above range, it may be difficult to improve the snag resistance. On the other hand, if the wale density exceeds the above range, it may be difficult to improve the texture and it may be difficult to maintain the stretchability.

[0034] The knitting machine used for manufacturing 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, the yarn used needs to be made thinner, and the knitted fabric strength 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 suppress a decrease in snag resistance. When there are multiple types of yarns constituting 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 yarns knitted in the front and / or back courses of the yarns knitting the knit tucks are structured as all-knit units. Combining knit-tucks and all-knits in the front and back of the knitting order in the wale direction makes it easier to make the knitted fabric denser. As the fabric becomes denser, the stretchability tends to decrease, but it is easier to contribute to anti-snag properties. The yarn length of the yarn forming the all-knit is preferably 120 mm / 100W or more and 350 mm / 100W or less. If the yarn length is less than 120 mm / 100W, it is difficult to produce stably and knitting defects may not be reduced. On the other hand, if it exceeds 350 mm / 100W, it is difficult to prevent the snag reduction of the knitted fabric. If multiple types or multiple strands of other yarns are used, the arithmetic average value of the other yarns is taken 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-mentioned knit-tuck structure and all-knit structure are preferably composed only of highly stretchable elongated false-twisted yarns, but they do not necessarily have to be composed only 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. More preferably, it is 120 g / m 2 More preferably, it is 220 g / m 2 The weight per unit area is as follows. If the weight per unit area is less than the above range, the density of the knitted fabric cannot be improved, and the stiffness and stiffness of the knitted fabric cannot be improved to reduce the occurrence of runs. On the other hand, if the weight per unit area exceeds the above range, the productivity cannot be improved. The weight per unit area can be measured by the method described in the Examples below.

[0039] The elongation rate in the cross direction of the knitted fabric of the present invention is preferably 25% or more and 100% or less. More preferably, it is 85% or less, and even more preferably, it is 70% or less. If the elongation rate in the cross direction exceeds the above range, run may easily occur, and it may be difficult to suppress the decrease in snag resistance. On the other hand, if the elongation rate in the cross 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 material if the elongation rate in the warp direction is kept slightly lower than that in the weft direction. Therefore, the warp elongation rate of the knitted fabric of the present invention is preferably 20% or more and 80% or less. More preferably, it is 70% or less, and even more preferably, it is 50% or less. If the warp elongation rate exceeds the above range, sewing may become difficult. On the other hand, if the warp elongation rate is less than the above range, the comfort of the product may decrease. The above-mentioned elongation rates in the warp and weft directions can be measured by the method described in the examples below.

[0041] In order to keep the elongation rate of the knitted fabric low as described above, it is preferable to fully express the crimp of the false twist yarn during dyeing processing, and then to entangle the knitted loops made of the bulky yarn, and then to apply a stronger heat treatment to the knitted fabric to heat set it. This heat setting is preferably performed at 180°C or higher in dry heat and 120°C or higher in wet heat, and more preferably at 190 to 210°C in dry heat and 125 to 135°C in wet heat. Specifically, the grey fabric may be subjected to a continuous relaxation process such as a relaxer to increase the crimp, and then a stronger heat setting may be performed. In addition, in order to suppress the elongation rate of the knitted fabric in the weft direction and adjust the balance of the elongation rates in the warp and weft directions, it is also preferable to finish the knitted loops in a weft direction by pulling them slightly more than in the warp direction.

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

[0043] In the case of double knit, 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 a 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 most suitable as a knitted fabric for uniforms, working uniforms, etc., which allow comfortable movement. EXAMPLES

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

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

[0047] <Stretchability of thread (%)> Measured based on JIS-L1013:2010 8.11 Elasticity C. As a pretreatment, the skein was wrapped in gauze and treated with hot water at 90℃ 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℃ 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] <Stretchability of knitted fabric (%)> Measurements were performed based on JIS-L1096:2010 8.16 B method (constant load) at a load of 490cN.

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

[0052] <Knit density> Based on the density of the knitted fabric, the number of courses (pieces / 2.54 cm) and the number of wales (pieces / 2.54 cm) on one side of the knitted fabric were measured. The number of wales and the number of courses are the number of wales per 1 inch in the horizontal direction and the number of courses per 1 inch in the vertical direction of the knitted fabric.

[0053] <Snag resistance> The snag grade 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 (saxe color) with antistatic yarn on the back was cut into a 15cm square, attached to the center of a white mount, and the mount was propped up against the observation plate of an observation device for judging wrinkles after washing in JIS-L1096 8.24, and the conspicuousness 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 conspicuous ×.

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

[0056] Example 1 A 30-inch, 36-gauge single circular knitting machine (JS type manufactured by Fukuhara Seiki Seisakusho) was used to knit a grey fabric consisting of a repetition of the complete structures F1 and F2 shown in Figure 3. For all yarn feeders, a pin-twisted yarn of 84 dtex (T) circular cross-section fiber and 48 filaments (f) made 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 and elongated false-twisted yarn. The stretching and elongation rate of this highly stretchable and elongated false-twisted yarn was 91.6%, the hot water dimensional change rate was -7.8%, and the yarn length of each yarn feeder was 175 mm / 100 wales (W).

[0057] The finished grey fabric was opened and continuously scoured according to recipe 1 below, and then dyed according to recipe 2 below, and finished. Formulation 1 (refining formulation): An open soap type continuous refining machine was used, 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 were used, and the bath temperature of the cleaning tank was changed from 60°C to 80°C to 80°C.

[0058] Recipe 2 (dyeing recipe): Using a Hisaka Seisakusho NS type liquid flow dyeing machine, the fabric was dyed in saxophone color at 130°C under high pressure 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 made by Meisei Chemical Industry Co., Ltd., 0.5 g / l Neo Crystal GC1000 made by Nicca Chemical Co., Ltd., 1.5% owf SR1800 made by Takamatsu Oil Co., Ltd., and 0.3% owf disperse dye (CI Disperse Blue 56). The fabric was then washed, centrifuged, and dried 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%. Then, the final set was performed under the conditions of 170°C x 120 seconds using a pin tenter, the amount of the yarn was adjusted, and the final knitted fabric was obtained. In addition, the finishing was performed without widening the width as much as possible to remove wrinkles, and without pulling 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 FIG. 3 was knitted using the same single circular knitting machine as in Example 1. At that time, the yarn feeder F1 was knitted with the same high elasticity extension false-twisted yarn as in Example 1 at a yarn length of 175 mm / 100 W, and F2 was knitted with a false-twisted yarn (elasticity extension rate 31.3%, hot water dimensional change rate -4.1%) (hereinafter referred to as friction false-twisted yarn) that was false-twisted with a friction false-twisting machine with a semi-dull circular cross section at a yarn length of 175 mm / 100 W. The completed greige machine was dyed and finished in the same manner as in Example 1. The blending ratio of the high elasticity extension false-twisted yarn in the knitted fabric was 50% by mass, and the blending ratio of the friction false-twisted yarn was 50% by mass. The composition of the knitted fabric in Example 2 and the evaluation results are shown in Table 1.

[0061] Example 3 A grey fabric having a knit structure consisting of complete structures F1 to F4 shown in FIG. 4 was knitted using the same single circular knitting machine (JS type manufactured by Fukuhara Seiki Seisakusho) as in Example 1. The same highly stretchable and elongated false-twisted yarn as in Example 1 was used for yarn feeders F1 to F4. The yarn length of yarn feeders F1 and F3 was 170 mm / 100W. The yarn length of yarn feeders F2 and F4 was 230 mm / 100W. The completed grey fabric 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. At that time, the same highly elastic and elongated false-twisted yarn as in Example 1 was used in the yarn feeders F1 and F3, and knitted 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 the yarn feeders F2 and F4, and knitted at a yarn length of 230 mm / 100 W. The blend ratio of the highly elastic and 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 completed grey fabric was dyed and finished in the same manner as in Example 3. The composition 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 type manufactured by Fukuhara Seiki Seisakusho) was used to knit a green fabric consisting of complete structures F1 to F6 shown in FIG. 5 by interlock gauging. At that time, a friction false-twist yarn of 56T24f polyethylene terephthalate with a semi-dull round cross section (stretching extension rate 28.9%, hot water dimensional change rate -3.5%) was used as the yarn forming the structure on the other side of the yarn feeders F1 and F4 and connecting the front and back with tucks. Next, a highly stretchable and elongated false-twisted yarn of 84T48f, the same as the yarn used in Example 1, was used as the yarn forming the structure on one side of the yarn feeders F2 and F5. Furthermore, a pin-twisted yarn of 56T36f round cross section fiber consisting of a conjugate fiber of a side-by-side cross section of polybutylene terephthalate (50% by mass) and polyethylene terephthalate (50% by mass), which is another highly stretchable and elongated false-twisted yarn, was used as the yarn forming the structure on one side of the yarn feeders F3 and F6. The stretching extension rate of this highly stretchable and elongated false-twisted yarn was 87.5%, and the hot water dimensional change rate was -9.9%. The yarn length of F1 and F4 was 200 mm / 100W, the yarn length of F2 and F5 was 210 mm / 100W, and the yarn length of F3 and F6 was 155 mm / 100W. The blending rate of the highly stretchable and elongated false-twisted yarn of 84T48f in the knitted fabric was 47% by mass, the blending rate of the highly stretchable and elongated false-twisted yarn of 56T36f was 23% by mass, and the blending rate of the friction false-twisted yarn of 56T24f was 30% by mass. The completed grey fabric was dyed and finished in the same manner as in Example 1. The composition 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 antistatic yarns at intervals of 15 mm in the warp direction of the back structure of Example 5. Specifically, the complete structure shown in FIG. F1 22T1f antistatic thread (KB Seiren White Beltron B68) F1 The yarns were then pulled together and knitted. The resulting greige fabric was dyed and finished in the same manner as in Example 5. The structure of the knitted fabric in 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 grey fabric consisting of complete structures F1 and F2 as shown in FIG. 3. The yarn used was a highly stretchable false-twisted yarn, a semi-dull circular cross section 84T24f pin-twisted yarn (stretching elongation rate 55.6%, hot water dimensional change rate -5.4%) of polybutylene terephthalate, knitted at a yarn length of 175 mm / 100 W. The completed grey 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 grey fabric consisting of complete structures F1 and F2 as shown in FIG. 3. The yarn used was the 84T36f friction false-twisted yarn with a semi-dull circular cross section (stretching elongation rate 31.3%, hot water dimensional change rate -4.1%) interwoven in Example 2, knitted at a yarn length of 175 mm / 100 W, instead of the highly stretchable false-twisted yarn. The completed grey fabric was dyed and finished in the same manner as in Example 1. The structure of the knitted fabric in 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 grey fabric consisting of complete structures F1 to F6 as shown in Figure 5. At that time, no highly stretchable false-twisted yarn was used for yarn feeders F2, F3, F5, and F6, and instead, the same friction false-twisted yarn as that used for yarn feeder F2 in Example 2 was used for F2 and F5. Also, the same 56T24f friction false-twisted yarn as that used for F1 and F4 was used for F3 and F6. Also, as in Example 6, once for every 12 repeats of the complete structure, a false-twisted yarn was used for the yarn feedersF1 22T1f antistatic thread (KB Seiren White Beltron B68) F1 The yarns were then pulled together and knitted. The resulting greige fabric 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 A grey fabric having an all-knit complete structure as shown in FIG. 6 was knitted using the same 30-inch, 36-gauge single circular knitting machine as in Example 1. The same 84T48f highly stretchable, elongated false-twisted yarn as in Example 1 was used for all yarn feeders. The yarn length of each yarn feeder was 260 mm / 100 wales (W). The completed grey fabric 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 structure as shown in FIG. 6 was knitted in the same manner as in Comparative Example 3. The yarn used was the same 84T36f friction false-twist yarn as the yarn used at yarn feeder F2 in Example 2, instead of the highly stretchable false-twist yarn. 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 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 the knitted tuck unit structure composed of the highly stretchable and elongated false-twisted yarn on one side was within the range of the present invention. On the other hand, Comparative Examples 1 and 2 have a knitted tuck unit structure, but are not composed of the highly stretchable and elongated false-twisted yarn, and Comparative Examples 3 and 4 do not have a knitted tuck unit structure in the first place, so they have stretchability but inferior anti-snag properties on one side. In addition, 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 a working uniform, which has both stretchability and anti-snag properties. Furthermore, it is possible to provide a knitted fabric in which colored antistatic yarn is not easily visible through the surface, even if colored antistatic yarn is used. Therefore, the present invention is extremely useful in the industry that manufactures and sells such clothing.

Claims

1. The knitted fabric is a double knit having knit-tuck unit structures on at least one surface thereof, at least a part of the knit-tuck unit structures being made of false twist yarn having a stretchability of 60 to 95%, and the ratio of knit-tuck unit structures made of false twist yarn having a stretchability of 60 to 95% to the entire structure constituting the one surface is 25 to 100%.

2. 2. The knitted fabric according to claim 1, wherein the false twist yarn having a stretch elongation rate of 60 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. 2. The knit of claim 1, wherein at least one face includes both knit-tuck and all-knit unit constructions.

5. The knitted fabric according to claim 2, characterized in that the conjugate composite fiber is made of polybutylene terephthalate and polyethylene terephthalate, and a knit-tuck unit structure composed of a false twist yarn of the conjugate composite fiber constitutes 40 to 100% of the structure constituting one surface.

6. The other surface of the knitted fabric has an electrical resistance of 10 ２ ~10 ９ 6. The knitted fabric according to claim 1, further comprising an antistatic yarn having a resistance of Ω / cm, and a frictional electrification voltage of the knitted fabric being 900 V or less.

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