What is the linear density of polyester warp yarns?
What is the linear density of polyester warp yarns ? The density is divided into warp density and weft density, referred to as warp and weft density. The metering method is generally indicated by the number of yarns in a length of 1 inch (2.54 cm) in China. The thickness of the cotton yarn: 40 British, the metric number is 14.5.
For example, the warp density of a fabric is 128/inch, and the weft density is 60/inch. When writing, we use the density × weft density, namely: 128×60 
The linear density of the fibers and the linear density of the fibers refer to the thickness of the fibers. The length of the fiber refers to the length of the fiber.
Textile fibers must have a certain linear density and length in order for the fibers to entangle each other and to be spun into yarns depending 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 value of the products.
The linear density of textile fibers is closely related to the properties of the textile processing and the finished yarns and fabrics. Under normal circumstances, the fiber density is low and the uniformity is good, which is beneficial to textile processing and product quality. In the influence of the fiber density on the wearing performance of the fabric, the fabric made of the finer fiber is softer and the gloss is softer. The thinner fabric can be used to make the fabric which is lighter and thinner, and the air permeability and the silk-like effect can also be produced. Good clothing fabric. However, the fabric made of fine fibers is easy to fluff and pilling, and the coarse fiber fabric can be used to make a stiff, rough and thick fabric.
Similarly, the length of textile fibers is also closely related to the quality of textiles and products. Longer fiber lengths, good length uniformity, and low staple fiber content are beneficial to textile processing and product quality. Under the same conditions, the fiber is long, the yarn strength is high, the strip is even, and the surface of the yarn is smooth. The fabric has good fastness, smooth appearance, and is not easy to fluff and pilling. In addition, under the premise of ensuring a certain yarn quality, the longer the fiber, the finer the spun yarn can be used to make a relatively thin fabric. 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 type and growth conditions. While chemical fibers are manufactured by hand, the linear density and length of the fibers can be artificially controlled and determined within a certain range according to the requirements of fiber processing and use.
The bulked yarn is firstly blended into two yarns of different shrinkage ratios, and then the yarn is placed in steam or hot air or boiling water. At this time, the fiber with high shrinkage produces a large shrinkage. The center of the yarn, and the low-shrinkage fibers mixed together, are squeezed on the surface of the yarn to form a loop shape due to the small shrinkage, thereby obtaining a bulky, full-bodied, elasticized bulky yarn.
The core-spun yarn is generally made of a synthetic fiber filament having a strong strength and elasticity as a core yarn, and a yarn obtained by twisting a short fiber such as cotton, wool or viscose fiber. The core spun yarn combines the excellent properties of a filament yarn and an outer staple fiber. The more common core-spun yarns are polyester-cotton core-spun yarns, which are made of polyester filament yarn and are wrapped with cotton fibers. There is also a spandex core-spun yarn, which is a yarn made of spandex filaments and is made of other fibers. The knitted fabric or the jeans material made of such a core-spun yarn is stretchable and comfortable when worn, and fits comfortably.
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