1. Raw material performance
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 fibers per unit section, the higher the twisting efficiency, the higher the yarn strength, and the smaller the strength unevenness. ; If the fineness unevenness is large, the strength of the yarn will decrease.
2. The influence of spinning process on fiber properties
The influence of the pre-spinning process on the strength of the yarn. The cleaning and carding process should reasonably select the opening and impurity removal process parameters. Under the premise of sufficient opening and carding, excessive damage to the fibers should be avoided, and short lint and impurities should be eliminated as much as possible; and rough application should be carried out. Properly configure the drafting process and drafting form to ensure the control of the fiber during the drafting process, improve the straightening and parallelism of the fiber, appropriately increase the temperature and humidity of the roving, increase the moisture regain of the roving, and facilitate the disappearance of fiber stress and ensure straightening, Reducing the drafting gap can stabilize fiber movement and produce rovings with even evenness and good structure. At the same time, the quantitative difference of cooked strips is controlled, the spindle difference of winding elongation is reduced, equipment maintenance and basic management work are strengthened, and the occurrence of weak loops is reduced. Reduce the property difference rate of raw materials, enhance the uniform mixing of raw materials in pre-spinning, improve the carding effect to increase the mixing between single fibers, increase the number of combinations in combing and drawing processes, etc., so that each raw material component is evenly distributed in the yarn, making the yarn During the stretching process of the thread, the strength of each fiber is fully utilized.
3. Yarn structure
The straightness and parallelism of the fibers and their arrangement and distribution in the yarn, the twist size of the yarn, the tension, width, tightness, fiber arrangement and straightening of the sliver before twisting, etc., all have a certain impact on the yarn strength. . Compact spinning is a good way to improve the structure of the whiskers before twisting, reduce yarn hairiness, and increase yarn strength.
4. Yarn uniformity
The weight unevenness, evenness and twist unevenness that affect the evenness of spun yarns mainly depend on the technology of the front area and the reasonable distribution of the friction zone, the distance of the front drafting area, the length of the floating area, and the apron jaws. Size, etc., control the yarn weight unevenness within 100 meters within 2%, the cotton roll unevenness within 1%, the combed short staple rate within 8%, etc. can improve the yarn weight unevenness. The speed consistency between spindles is the direct factor affecting the uneven yarn twist. The spindle belt and splicing method, and the spindle belt tension device are the basis for ensuring the stability of the spindle speed. To improve the yarn strength, we should start from the aspects of rational selection of raw materials, reducing mixing differences, improving the quality of pre-spun semi-finished products, improving the structure of semi-finished products and finished yarn, improving the evenness of spun yarn and rationally selecting the twist coefficient.
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