In addition to raw materials, how to improve yarn strength?

1. Raw material performance

Length, fineness, breaking length, maturity, short fiber content and other fiber lengths are long, with good uniformity and fine fiber fineness. The more the number of fibers per unit section, the higher the twisting efficiency, the higher the yarn strength and the smaller the unevenness. The larger the fineness unevenness, the lower the yarn strength.

2. Effect of spinning process on fiber properties

The influence of pre-spinning process on yarn strength The process parameters of opening and impurity removal are reasonably selected in the carding process. Under the premise of full opening and carding, excessive damage of fibers is avoided and short pile and impurities are eliminated as much as possible. The drafting process and drafting form should be reasonably configured to ensure the control of fibers in the drafting process, improve the straightening parallelism of fibers, appropriately increase the temperature and humidity of roving, and increase the moisture regain of roving of roving, it is easy to straighten and ensure the elimination of fiber stress, and reduce the stretching distance, which can stabilize the fiber movement and make the roving with uniform and good structure. At the same time, the quantitative difference of cooked strips is controlled, the ingot difference of winding elongation is reduced, the maintenance and basic management of equipment are strengthened, and the generation of weak rings is reduced. Reduce the property difference rate of raw materials, enhance the uniform mixing of raw materials by pre-spinning, improve the carding effect, increase the mixing between single fibers, increase the number of combing and drawing processes, etc., each raw material component is evenly distributed in the yarn, so that the strength of each fiber in the yarn drawing process is reasonably and fully utilized.

3. Yarn forming structure

The straightening parallelism of the fiber and the arrangement and distribution in the yarn, the tension, width, tightness, fiber arrangement and straightening of the yarn before twisting, etc. have a certain influence on the strength of the yarn. Tight spinning is a good way to improve the structure of the pre-twist whisker, reduce yarn hairiness and improve yarn strength.

4. Yarn uniformity

The influence of weight unevenness, strip unevenness and twist unevenness on the yarn evenness mainly lies in the reasonable distribution of the process and friction force boundary in the front area. The distance between the front draft area, the length of the floating area, the size of the rubber ring jaw, etc. can be controlled within 2% of the weight unevenness of the finished yarn 100 meters, the unevenness of cotton rolls within 1%, and the combed lint rate within 8%. The speed consistency between ingots and ingots is a direct factor affecting the unevenness of yarn twist, and the tape and joint method, the tape tension device are the basis for ensuring the stability of the ingot speed. To improve the yarn strength, we should start from the aspects of reasonable selection of raw materials, reduction of mixing differences, improvement of the quality of semi-finished products in front spinning, improvement of semi-finished products and yarn structure, improvement of yarn strand dryness and reasonable selection of twist coefficient.

For many years specializing in nylon research and development, production and operation and consulting services of high-tech enterprises. Located in the famous town of socks-Datang Town, Zhuji City, Zhejiang Province. In the more than 20 years since the "swallow" was opened, we have worked tirelessly and continuously, gradually developing from the initial 2 reloading machines to a factory with 24 nylon filament POY screws, 8 DTY reloading machines and 45 yarn rewinding machines. Daily output, POY: 20 tons, DTY: 20 tons, colored nylon yarn: 6 tons, covered yarn: 3 tons, rubber thread: 3 tons. The company strictly implements ISO9001 international quality system standards and ISO14001 environmental management system standards, and products are strictly in accordance with OEKO-TEX standards.