Views: 7 Author: Site Editor Publish Time: 2022-01-03 Origin: Site
Textile fiber generally refers to a few microns or tens of microns in diameter, and the length is many times larger than the diameter. It can be used to process and manufacture textile objects and is characterized by being thin and long. Textile fibers must have a certain fineness and length in order to make the fibers cohesive with each other, and rely on the friction between the fibers to spin into yarn. This is also one of the necessary conditions for textile processing and the use of products.
Length is one of the main quality indicators of fiber materials and an important factor that determines the spinning value of fiber materials.
The relationship between fiber length and yarn quality is very close. Mainly manifested in the following aspects.
1. The fiber ball length and yarn strength are in the yarn. If the fiber length is longer, the contact length between the fiber and the fiber is longer. When the yarn is subjected to external force, the fiber is not easy to slip off. At this time, the yarn is stretched The number of slipped fibers is less, so the yarn strength is higher. The change of fiber length has different effects on the rise and fall of yarn strength. When the fiber length of the yarn is relatively short, the influence of the length on the yarn strength is relatively large. Among the commonly used textile fibers, the length of cotton fiber is relatively short, so its length has a greater influence on the strength of the yarn. The uniformity of fiber length also affects the yarn strength. When the short-staple ratio of raw cotton is higher than 15%, the yarn strength will decrease significantly.
2. Fiber length and yarn density There is a limit to the spinning density of fibers of various lengths. On the premise of ensuring that the yarn has a certain strength, the longer the fiber length, the smaller the limit linear density of the spun yarn, that is, the thinner the spun yarn; the shorter the fiber length, the greater the limit linear density of the spun yarn , That is, the thicker the spun yarn. For example, fine-staple cotton with a length of 25mm or less can only be spun medium and coarse special yarns of 30 tex or more; for a fine-staple cotton with a length of about 29 mm, the limit linear density of the spun yarn is 10 tex. For spun yarn, long-staple cotton must be used. The longest fiber of long-staple cotton can be spun to 3tex spun yarn.
3. Fiber length and yarn evenness uniformity The longer the fiber length and the higher the uniformity of the length, the better the yarn evenness. When the fiber length is very short and the length uniformity is poor, the evenness will be poor, and the quality of the finished yarn will decrease.
4. Fiber length and yarn hairiness When the fiber is longer, the fiber ends on the yarn are less exposed, the yarn hairiness is less, and the surface is smooth. On the contrary, the yarn surface has more hairiness.
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