1. Raw material properties, such as length, fineness, breaking length, maturity, short fiber content, etc. The fiber length is long, the uniformity is good, and the fiber fineness is fine. The more the number of fibers per unit section, the higher the twisting efficiency, the stronger the yarn. The higher the strength, the smaller the unevenness; the larger the fineness unevenness, the lower the yarn strength.
2. The effect of spinning process on fiber performance. The effect of spinning process on yarn strength. The clearing and carding process should reasonably select the opening and impurity removal process parameters. Under the premise of full opening and carding, excessive fiber damage should be avoided. It is possible to eliminate the short lint and impurities; and the drafting process and drafting form should be reasonably configured to ensure the control of the fiber during the drafting process, improve the straightness and parallelism of the fiber, appropriately increase the temperature and humidity of the roving, and increase the moisture regain of the roving. It is easy for the fiber stress to disappear and ensure the straightening, and the shortening of the drafting distance can stabilize the fiber movement, and make a roving with a uniform even structure. At the same time, it controls the difference in the ration of the cooked sliver, reduces the spindle difference of winding elongation, strengthens the maintenance and basic management of the equipment, and reduces the generation of weak rings. Reduce the rate of difference in the properties of the raw materials, enhance the uniform mixing of the raw materials by the pre-spinning, increase the combing effect, increase the mixing between single fibers, increase the number of combing and drawing processes, etc., each raw material composition is evenly distributed in the yarn, so that the yarn The strength of each fiber is reasonably and fully utilized during the stretching process of the thread.

3. The structure of the yarn, such as the straightness and parallelism of the fibers and the arrangement and distribution of the yarn, the twist of the yarn, etc. The tension, width, tightness, fiber arrangement and straightening of the strands before twisting, etc. Line strength has a certain influence. Compact spinning is a good way to improve the structure of the beard before twisting, reduce the hairiness of the yarn, and increase the strength of the yarn.
4. Yarn uniformity, such as weight unevenness, unevenness and twist unevenness, affect the evenness of spun yarn, which mainly lies in the reasonable distribution of the front zone process and friction boundary, the front drafting zone gauge, Ganoderma lucidum Broken spore powder, Ganoderma lucidum spore powder, Ganoderma lucidum price, Gastrodia price, the length of the floating area of ​​Dendrobium Huoshan, the size of the apron jaws, etc., control the uneven weight of the yarn within 2% of 100 meters, and the uneven rate of the cotton roll at 1% Within 8%, the combed short pile rate can increase the unevenness of the yarn weight.