What are the factors that affect yarn strength? How to improve the low 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, 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; the larger the fineness unevenness, the higher the twisting efficiency. The yarn strength decreases.
2. The impact 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 fiber damage can be avoided, and short lint and impurities can be eliminated as much as possible; and rough application 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 ensure the straightening and shrinkage of the fiber due to the disappearance of fiber stress. The drafting gap can stabilize the fiber relaxation and produce a roving with even evenness and good structure. At the same time, the quantitative difference of cooked strips can be controlled to reduce the spindle difference in winding elongation, strengthen the maintenance and basic management of equipment, and reduce the occurrence of weak loops. Reduce the property difference rate of raw materials, enhance the uniform mixing of raw materials in pre-spinning, improve the carding effect, 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 spinning yarn, so that The strength of each fiber is reasonably and fully utilized during the stretching process of the spinning yarn.
3. Yarn structure, such as the straightness and parallelism of fibers and their arrangement and distribution in the yarn, the twist size of the spinning yarn, etc. The tension, width, and tightness of the sliver before twisting , fiber arrangement and straightening have a certain impact on the strength of spinning yarn. Compact spinning is a good way to improve the structure of the whiskers before twisting, reduce the hairiness of the yarn, and increase the strength of the spinning yarn.
4. Yarn uniformity, such as weight unevenness, evenness and twist unevenness, etc., which affect the evenness of spun yarns, mainly lies in the process of the front area and the reasonable distribution of the friction zone. The distance between the front drafting zone, the length of the floating zone, the size of the apron jaws, etc. are controlled to control the yarn weight unevenness within 100 meters within 2%, the cotton roll unevenness within 1%, and the combed short staple rate within 8%. It can increase the uneven weight of spinning yarn. The speed consistency between spindles is the direct factor affecting the uneven twist of the spinning yarn. The spindle belt and splicing method, and the spindle belt tension device are the basis for ensuring the stability of the spindle speed. Improving the strength of finished yarn 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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