The relationship between fiber length and yarn quality
Fabric 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 organize and make fabrics, and are characterized by being thin and long. Fabric 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 fabric finishing 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 spinning yarn, if the fiber length is longer, the contact length between fibers will be longer. When the spinning yarn is acted upon by external force, the fiber will not easily slip off. At this time, the fiber length in the spinning yarn will be longer. The number of fibers that slip due to tension is smaller, so the strength of the yarn 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 spinning yarn is short, the length has a relatively greater impact on the strength of the yarn. Among the commonly used fabric 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 spun yarn density There is a limit value for the spun yarn density of various fiber lengths. Under the premise of ensuring that the 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 smaller the ultimate linear density of the spun yarn. The larger, 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 spinning yarn is 10tex. If you want to spin less than 10tex The fine yarn must be made of long-staple cotton. The long fibers of long-staple cotton can be spun into fine yarns of 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 spinning yarn is less exposed, the yarn has less hairiness, and the surface is clean. On the contrary, the yarn surface has more hairiness.
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