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 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 lower the yarn strength.
2. The influence of the spinning process on fiber properties. The influence of the pre-spinning process on the yarn strength. The cleaning and carding process should reasonably select the opening and impurity removal process parameters. On the premise of sufficient opening and carding, , avoid excessive damage to the fiber, and eliminate short lint and impurities as much as possible; the drafting process and drafting form should be reasonably configured to ensure the control of the fiber during the drafting process, improve the straightening and parallelism of the fiber, and appropriately increase the roving Temperature and humidity increase the moisture regain of the roving, which makes it easy for the fiber stress to disappear and ensure the straightening and stretching. The narrowing of the drafting distance can stabilize the fiber relaxation and produce a roving with even dryness 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. The yarn structure such as the straightness and parallelism of the fibers and their arrangement and distribution in the yarn, the twist size of the spinning yarn, etc. The tension, width, tightness, etc. of the strands before twisting, etc. 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. The evenness of the yarn, such as weight unevenness, unevenness and twist unevenness, etc., mainly affect the evenness of the spun yarn, mainly due to the process of the front area and the reasonable distribution of the friction zone. The distance between the 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 lap unevenness within 1%, and the combed short staple rate within 8%. etc. can improve 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.
AAAVBJYTUJGHNH
Disclaimer:
Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.
AA
