What Conditions Need To Be Met For Polyester Silk Yarn Production?

　　For better normal production and product quality, knitting yarn should meet the following requirements:

　　1. Yarn sold with polyester silk yarn should have certain strength and extensibility

　　Yarn strength is an important quality index of knitting yarn. Since the yarn is subjected to a certain tension and repeated loads during preparation and weaving, the yarn for knitting must have a certain strength. In addition, the yarn is also subject to bending and torsional deformation during the knitting process, so the knitting yarn is also required to have a certain degree of extensibility, to facilitate bending during the knitting process and reduce yarn breakage.

　　2. The yarn should have good softness

　　The softness of knitting yarn is higher than that of weaving yarn. Because the soft yarn is easy to bend and twist and makes the loop structure in the knitted fabric uniform, the appearance is clear and beautiful, and it can also reduce the breakage of the yarn and the damage to the loop-forming parts during the weaving process.

　　3. The yarn should have a certain twist

　　In general, knitting yarns have a lower twist than weaving yarns. If the twist is too large, the softness of the yarn will be poor, and it is not easy to be bent and twisted during weaving, and it is also prone to kinks, causing weaving defects, and damage to the knitting needles; in addition, yarns with too much twist will affect the elasticity of 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 number of broken ends during weaving, and the yarn will be bulky, making the fabric easy to pilling and reducing the wearability of the knitted fabric. Therefore, choosing the twist correctly is an important way to choose the yarn reasonably. The use of knitted fabrics is different, and the twist requirements are also different.

　　The jersey requires smoothness, tightness, a smooth surface, and clear texture, and the twist of the yarn should be larger, which can be close to the warp yarn standard for weaving with the same linear density. The twist of the yarn used for outerwear should be larger to enhance the crispness and improve the pilling phenomenon. Cotton wool cloth and elastic cloth require a soft hand feel and high elasticity, and the twist of the yarn should be slightly lower. Generally, the lower deviation of the twist of the weft yarn for weaving with the same linear density is used. The yarn used for pile-knitted fabrics requires a smaller twist to facilitate brushing and make the pile thickness uniform.

　　In addition, the size of the twist also varies with the linear density of the yarn.

　　4. The linear density of the yarn should be uniform and the yarn defects should be less

　　Yarn linear density uniformity, that is, the uniformity of yarn dryness, is an important quality index of knitting yarn. The even and dry yarn is beneficial to knitting processing and fabric quality, making the loop structure uniform and the cloth surface clear. If there are thick spots on the yarn, the knitting cannot go through smoothly, causing yarn breakage or damage to the machine parts, and it is easy to form "horizontal stripes" and "cloud spots" on the cloth surface, which will reduce the quality of knitted fabrics; For details, the strength is insufficient here, and it is easy to break, which affects the quality of the fabric and reduces the productivity of the machine. Because there are multiple knitting systems on the knitting machine, the yarns are fed into loops at the same time, so not only the thickness of each yarn is required to be uniform, but also the thickness difference between the yarns must be strictly controlled, otherwise horizontal stripes will be formed on the cloth surface. Defects such as shadows reduce fabric quality.

　　5. The yarn should have good hygroscopicity

　　The ability of a yarn to absorb moisture in the air is called hygroscopicity. The moisture absorption capacity of various fibers is very different, and the moisture absorption capacity varies with the temperature and humidity of the air. The yarn used for knitting production should have a certain hygroscopicity. Under the same relative humidity conditions, the yarn with good hygroscopicity, in addition to its better electrical conductivity, is also conducive to the stability of yarn twist and the improvement of extensibility, so that the yarn has good weaving performance.

　　6. Polyester yarn should have a good finish and a small coefficient of friction

　　Yarn for knitting should be as free of impurities and oil stains as possible and should be very smooth. Unsmooth yarns have severe wear and tear on the machine parts and are easy to damage the machine parts. Moreover, there are many flying flowers in the workshop, which not only affects the health of workers but also affects the productivity of knitting machines and the quality of fabrics.