What factors affect the strength of yarn? How to improve the strength of yarn?
1, raw material properties such as length, fineness, breaking length, maturity, short fiber content, etc. The fiber length is long, the uniformity is good, the fiber fineness is fine, the more fibers per unit section, the more twisting efficiency If the fineness unevenness is high, the yarn strength will be higher and the strength unevenness will be small; if the fineness unevenness is large, the yarn strength will decrease.
2. The influence of spinning process on fiber properties. The influence of pre-spinning process on yarn strength. Reasonable selection of opening and impurity removal process parameters in the cleaning and carding process. , on the premise of full opening and carding, avoid excessive damage to the fiber, and eliminate short lint and impurities as much as possible; and the drafting process and drafting form should be reasonably configured to ensure the control of the fiber during the drafting process and improve The straightening and parallelism of the fiber can be appropriately increased by increasing the temperature and humidity of the roving and increasing the moisture regain of the roving, which makes it easy for the fiber stress to disappear and ensure the straightening and straightening. Reducing the drafting distance can stabilize the fiber movement and produce a roving with uniform 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 the raw material components are 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 such as the straightness and parallelism of fibers and their arrangement and distribution in the yarn, the twist size of the yarn, etc. before twisting the sliver The tension, width, tightness, fiber arrangement and straightening 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. The evenness of the yarn, such as weight unevenness, uneven evenness and uneven twist, mainly affects the evenness of the spun yarn in the front area. The reasonable distribution of technology and friction, the distance of the front drafting zone, the length of the floating zone, the size of the apron jaws, etc., control the yarn weight unevenness within 100 meters within 2%, and the cotton lap unevenness within 1% , the combed short staple rate is within 8%, etc., which can reduce uneven yarn weight. 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-spinning 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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