Knitting warp knitting, weft knitting two major categories, mainly used in cotton yarn weft knitting machine. Weft knitting is a woven knitted fabric in the weft direction. The yarn is fed to the knitting area of ​​the knitting machine with a certain tension, and the yarn is knitted in a series of loops and knits. From the weaving point of view, the yarns are required to be soft, smooth, uniform and uniform, with a certain degree of strength and elongation at break, uniform evenness, and less detail. Because the knitted fabric is loose, the gap between the yarn and the yarn is more, and the unevenness of the original sliver directly affects the appearance of the fabric, and the detail is more harmful. Flying flowers are less. 1, the main problems in the current knitting yarn The quality and performance of the knitted fabric depends on the properties of the knitted raw material, the structure and specifications of the knitted fabric, the dyeing and finishing and other factors. Among them, the performance of knitted raw materials is the main factor affecting the properties of knitted fabrics. The use of knitted fabrics varies and the choice of raw materials varies. Most knitted fabrics for underwear use cotton yarn; raw materials for socks include cotton yarn, wool and chemical fiber; wool sweater, acrylic fiber and acrylic blend yarn are mainly used for knitted sweaters; polyester, nylon, acrylic and blended fabrics are the main raw materials for knitted garments. Yarn and new textile materials (such as tencel fiber, differentiated fiber, etc.); special industrial raw materials are mainly glass fiber, metal wire, aramid fiber and so on. The composition of the raw material may be a pure spinning yarn containing only one kind of fiber or a mixed spinning yarn above two kinds of fibers; (e.g., a decorative yarn, a slub yarn, a knot yarn, a core yarn, etc.). In addition, the emergence of new types of raw materials such as chemical fiber shaped fibers and composite fibers, especially ultra-fine fibers, has opened up new ways for knitting yarns. The testing of the yarns in the laboratory can basically reach the first-class product level. Only the impurities of the carded yarns are exceeded, and the very few twist factors exceed 360. The second is that the lines are not even, and the blackboard cannot be reflected. The blackboard of 0.9.1.0 will appear cloudy on the object. No matter whether it is carding or combing, even the long-staple cotton yarn has appeared. The third is foreign fiber, which has been combed and combed. The foreign fiber yarn can only be covered by dyeing products. Fourth, the white spots of the neps and the uneven coloration are prominent on the carded yarn. The fabric of the blended yarn is unevenly colored. Fifth, hairiness, cotton yarn hairiness, weaving more than when the flower, weaving into the flower coat is woven, bad needle, light finished fabric, cloth surface hair, not smooth. 2. Quality Requirements of Yarn Support for Knitting Enterprises Weft-knitting large garden machine, more than 100 root yarns are fed together and woven, with slight deviation, they will be exposed on the surface of knitted fabrics, especially single-knit fabrics, ribbed, double rib fabrics, due to different organizational structure, reflecting not obvious. Physical testing of first-class products is the basic condition, mainly for weaving services. Not only does the rough cloth meet the requirements, but the physical quality of the light blank cloth after dyeing and finishing is no problem. Single strength, twist factor can meet the following requirements: (1) The twist factor should not exceed 340; (2) Yarn sticks should be uniform; (3) There is no foreign fiber as much as possible; (4) The number of negligible particles in the neps must be small, there should be no white spots with low coloring rate, and the dyeing uniformity is good, and it is better to reach 4 to 5 grades; (5) Less hairiness can reduce fly-out during weaving and improve the cloth surface finish of finished light products. In the process of forming a knitted fabric on a knitting machine, the yarn is subjected to complicated mechanical actions such as stretching, bending, twisting, and friction. In order to ensure the normal production and the quality of the product, the yarn for knitting should meet the following requirements: 1, the yarn should have a certain strength and extensibility The strength of the yarn is an important quality index of the yarn for knitting. Because the yarn undergoes certain tension and repeated loads during the preparation and weaving process, the yarn for knitting must have a certain strength. In addition, the yarn is subjected to bending and torsional deformation during the knitting and knitting process. Therefore, the knitting yarn is also required to have a certain degree of extensibility so as to be bent into a loop during knitting and to reduce yarn breakage. 2, the yarn should have good flexibility Knitting yarns are more flexible than weaving yarns. Because the soft yarns are easy to bend and twist, the structure of the loops in the knitted fabric is uniform, the appearance is clear and beautiful, and at the same time, the yarn breakage and the damage to the looped parts during the weaving process can be reduced. 3, the line should have a certain degree of twist In general, the twist of a knitting yarn is lower than that of a weaving yarn. If the twist is too large, the softness of the yarn is poor, and it is not easy to be bent or twisted during weaving, and it is also easy to cause kinks, resulting in weaving blemishes and damage to the knitting needles; in addition, excessively large yarns may affect the elasticity of the knitted fabrics. And skew the coil. However, the twist of the knitting yarn should not be too low, otherwise it will affect its strength, increase the breakage during weaving, and the yarn is bulky, so that the fabric can be easily pilled and pilling, and the wearing performance of the knitted fabric can be reduced. Therefore, the correct choice of twist is an important way to use yarns rationally. The use of knitted fabrics is different, and there are differences in the degree of twist. Han cloth requires smoothness, tightness, smooth surface, clear lines, and large twist of yarn, which can approach the standard of weaving warp yarns with the same linear density. The twist of the yarn used in the outer garment should be larger to enhance the stiffness and improve pilling. Cotton wool and elastic cloths are required to have a soft and elastic feel. The twist of the yarn should be slightly lower. Generally, the same linear density is used to weave the lower deviation of the weft yarns. Yarn for fleece knitwear, in order to facilitate brushing, and to make the thickness of the pile uniform, less stringent requirements. In addition, the size of the twist varies with the thread density. 4, the yarn's linear density should be uniform, less yarn defects The evenness of the yarn linear density, that is, the uniformity of the yarn, is an important quality index of the yarn for knitting. The even and uniform yarns are beneficial to the knitting process and ensure the quality of the fabric, so that the coil structure is uniform and the fabric surface is clear. If there is a thick knot on the yarn, the weaving will not be able to pass smoothly, causing the yarn to break or damage the parts. Moreover, the “horizontal bar†and “cloud spot†will be easily formed on the surface of the fabric to reduce the quality of the knitted fabric; The details, then, are not strong enough at this point to break the head easily, affecting the quality of the fabric and reducing the machine's productivity. Because the knitting machine has a multi-looping system and yarn feeding at the same time, not only the thickness of each yarn is required to be uniform, but also the difference in the thickness of the yarn between the various paths must be strictly controlled, otherwise horizontal stripes will be formed on the cloth surface. Shadows and other rickets reduce fabric quality. 5, yarn should have good hygroscopicity The ability of yarns to absorb moisture in the air is called hygroscopicity. The absorption capacity of various fibers varies greatly, and the amount of moisture absorption varies with the temperature and humidity of the air. The yarn used for knitting should have a certain hygroscopicity. Under the same relative humidity condition, the yarn with good hygroscopicity, besides its good electrical conductivity, is also beneficial to the stability of the yarn twist and the extensibility improvement, so that the yarn has a good weaving performance. 6, the yarn has a good finish and a small coefficient of friction Knitting yarns should be free of impurities and grease, and should be as smooth as possible. Non-smooth yarns have great wear on the parts, which can easily damage the parts and fly in the workshop. This not only affects the health of the workers, but also affects the productivity of the knitting machine and the quality of the fabric. In addition, during the knitting process, the yarns are in frictional contact with a variety of mechanical components for relative sliding, so that the yarns are subjected to a certain resistance, thereby generating yarn tension. Therefore, a yarn with a rough surface or a yarn with a large coefficient of friction will have a higher yarn tension when it passes through a looping machine, which affects the evenness of the yarn tension, resulting in unevenness of the coil structure. In order to reduce the coefficient of friction of the yarn, the surface of the yarn may be awakened by antistatic agents and lubricating oils or waxes.
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