Composite fabric information on the relationship between fiber length and yarn quality

Textile fibers generally refer to objects with a diameter of several microns or tens of microns, and a length many times larger than the diameter. They can be used to process and manufacture textiles and are characterized by their thinness and length. Textile fibers must have a certain fineness and length so that the fibers can cohere with each other and be spun into yarn relying on the friction between the fibers. This is also one of the necessary conditions for textile processing and making products valuable.
1. Length Length is one of the main quality indicators of fiber materials and an important factor in determining the spinning value of fiber materials. (1) The relationship between fiber length and yarn quality The relationship between fiber length and yarn quality is very close. Mainly manifested in the following aspects. 1. Fiber length and yarn strength. In the yarn, if the fiber length is longer, the contact length between fibers will be longer. When the yarn is acted upon by external force, the fibers will not easily slip off. At this time, the yarn will be under tension. The number of slipped fibers is smaller, so the yarn strength is higher. Changes in fiber length have different effects on the rise and fall of yarn strength. When the length of the fibers that make up the yarn is short, the length has a relatively greater impact on the strength of the yarn. Among the commonly used textile fibers, the length of cotton fiber is shorter. Therefore, its length has a greater impact on the strength of the yarn. Fiber length uniformity also affects 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 value for the yarn density of various fiber lengths. On the premise of ensuring that the finished yarn has a certain strength, the longer the fiber length, the smaller the ultimate linear density of the spun yarn, that is, the thinner the spun yarn; the shorter the fiber length, the greater the ultimate linear density of the spun yarn. , that is, the thicker the yarn being spun. For example, fine velvet cotton with a length of less than 25mm can generally only spin medium and thick special yarns with a length of more than 30tex; for fine velvet cotton with a length of about 29mm, the limit linear density of yarn spun is 10tex. If you want to spin less than 10tex Fine yarn must be made of long-staple cotton. The longest fiber of long-staple cotton can be spun into fine yarn up to 3tex. 3． Fiber length and yarn evenness: The longer the fiber length and the higher the length uniformity, the better the spun yarn evenness. When the fiber length is very short and the length uniformity is poor, the evenness becomes poor and the yarn quality decreases. 4. Fiber length and yarn hairiness: When the fiber is longer, the fiber head end on the yarn is less exposed, the yarn has less hairiness, and the surface is smooth. On the contrary, the yarn surface has more hairiness.
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