- The yarn should have a certain twist.
Generally speaking, the twist of knitted yarn is lower than that of woven yarn. If the twist is too large, the softness of the yarn will be poor. It is not easy to bend and twist during weaving. It is also prone to twist, which causes knitting defects and damages the knitting needle. In addition, the yarn with too large twist will affect the elasticity of the knitted fabric and make the coil skew. But the twist of knitting yarn can not be too low, otherwise it will affect its strength, increase the breakage of knitting, and the yarn is bulky, making the fabric easy to fuzz and pill, and reducing the wearability of knitted fabric. Therefore, the correct selection of twist is an important way to select yarns reasonably. Knitted fabrics have different uses and twist requirements.
- Yarn density should be uniform and yarn defects should be less.
Yarn density uniformity, that is, yarn evenness, is an important quality index of knitting yarn. Uniform yarn is beneficial to knitting process and fabric quality, making the coil structure uniform and the cloth surface clear. Because there are multiple looping systems on the knitting machine, it is not only required that the yarn thickness is uniform, but also that the yarn thickness difference between different routes should be strictly controlled. Otherwise, cross stripes, shadows and other defects will be formed on the cloth surface to reduce the fabric quality.