Textile fibers must have a certain linear density and length, so that the fibers can be entangled with each other, and they can be spun into yarn by relying on the friction between the fibers. Therefore, textile fibers have a certain linear density and length, which is one of the necessary conditions for textile processing and the use of products.

The linear density of textile fibers is closely related to the performance of textile processing and the yarns and fabrics made.

The linear density of the fiber refers to the thickness of the fiber

Under normal circumstances, the lower fiber linear density and better uniformity are beneficial to textile processing and product quality. In the influence of fiber thread density on the wearability of fabrics, fabrics made of finer fibers are softer and have a softer luster. Thinner fibers can be used to make lighter fabrics, and they can also produce good air permeability and silk-like effects. Good clothing fabric. However, the fabric made of fine fibers is easy to fuzz and pilling, while the thick fiber fabric can be made into a stiff, rugged and thick fabric.

The length of the fiber refers to the length of the fiber

Similarly, the length of textile fibers is also closely related to the quality of textiles and products. Long fiber length, good length uniformity, and low short fiber content are beneficial to textile processing and product quality. Under the same conditions, if the fiber is longer, the yarn strength will be high, the yarn evenness will be uniform, the yarn surface will be smooth, the finished fabric will have good fastness, smooth appearance, and not easy to fluff and pilling.

In addition, under the premise of ensuring a certain yarn quality, the longer the fiber, the thinner the yarn can be spun, which can be used to make lighter and thinner fabrics. For shorter lengths, length is more important than linear density. For example, in cotton grade and pricing, length is the most important indicator.

In textile fibers, the linear density and length of natural fibers are not uniform, and sometimes the difference is large. It varies with fiber varieties and growth conditions. The chemical fiber is artificially manufactured, and the linear density and length of the fiber can be controlled and determined artificially within a certain range according to the requirements of fiber processing and use.