What are the factors that affect the yarn strength

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 the number of fibers per unit section, the higher the twisting efficiency, the stronger the yarn. The higher the strength, the smaller the unevenness; the larger the fineness unevenness, the lower the yarn strength.

2. The influence of spinning process on fiber properties. Influence of pre-spinning process on yarn strength The cleaning and carding process should reasonably select the parameters of opening and impurity removal. Under the premise of sufficient opening and carding, excessive fiber damage should be avoided, and short piles and impurities should be excluded as much as possible.

The drafting process and drafting form should be reasonably configured to ensure the control of the fibers during the drafting process, improve the straightness and parallelism of the fibers, appropriately increase the temperature and humidity of the roving, increase the moisture regain of the roving, and facilitate the guaranteed stretching due to the disappearance of the fiber stress. Straight, narrow drafting gauge stabilizes fiber movement and produces rovings with good evenness and structure.

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. The raw material components are evenly distributed in the yarn, so that the yarn The strength of each fiber in the thread is fully utilized during the drawing process.

3. Yarning structure, such as the straightness and parallelism of fibers and their arrangement and distribution in the yarn: the degree of tension, width, tightness, fiber arrangement and straightening of the yarn before twisting, etc. Strength has a certain effect. Compact spinning is a good method to improve the structure of the beard before twisting, reduce the hairiness of the finished yarn and improve the strength of the yarn.

4. Yarn uniformity: such as weight unevenness, evenness and twist unevenness, etc. affect the evenness of spun yarn mainly in the process of the front area and the reasonable distribution of the friction field, the spacing and floating in the front drafting area. The length of the area, the size of the apron jaws, etc., the weight unevenness of the finished yarn is controlled within 2 percent per 100 meters, the unevenness rate of the lap is within 1 percent , and the combed short staple rate is within 8 percent , which can improve the yarn weight unevenness. uniform.