The density of the fabric refers to the number of warp or weft yarns per unit length of the fabric.

Density is divided into warp density and weft density, referred to as warp density and weft density. The measurement method is generally adopted in my country: the number of yarns within 1 inch (2.54 cm) length.

For example: a certain fabric has a warp density of 128 threads/inch, and a weft thread density of 60 threads/inch. When writing, we use warp density×weft density to express, namely: 128×60

The linear density and length of the fiber The linear density of the fiber refers to the thickness of the fiber. The length of the fiber refers to the length of the fiber.

Textile fibers must have a certain linear density and length in order to make the fibers cohesive with each other, and rely on the friction between the fibers to spin into yarn. Therefore, the textile fiber has a certain linear density and length, which is one of the necessary conditions for textile processing and the product to have use value.

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

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 has good fastness, smooth appearance, and it is 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, which varies with fiber types 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.

Bulk yarn is made by blending two fibers with different shrinkage rates into yarn, and then treating the yarn in steam, hot air or boiling water. At this time, the fiber with high shrinkage rate will shrink and it is located in the center of the yarn. , And the mixed low-shrinkage fiber, due to the small shrinkage, is squeezed on the surface of the yarn to form a loop shape, thereby obtaining a bulky, plump and elastic bulky yarn.

Core-spun yarns are generally made of synthetic fiber filaments with good strength and elasticity as the core yarn, with short fibers such as cotton, wool, and viscose fibers being twisted together. The core-spun yarn has the excellent properties of filament core yarn and short-wrapped fiber. The more common core-spun yarn is polyester-cotton core-spun yarn, which uses polyester filament as the core yarn and wraps cotton fibers. There is also spandex core-spun yarn, which is a yarn made of spandex filament as the core yarn and outsourcing other fibers. The knitted fabric or jeans material made of this core-spun yarn can stretch freely and fit comfortably when wearing.