The linear density of fiber the linear density of length fiber refer to the thickness of fiber. Fiber length refers to the length of the fiber.
The textile fibers must have a certain linear density length, so that the fibers can hold each other, rely on the friction between the fibers to spin into yarn. Therefore, the textile fiber has a certain linear density length, which is one of the necessary conditions for textile processing making the product have use value.
The linear density of textile fiber is closely related to the properties of yarn fabric. In general, the lower the linear density the better the uniformity of the fiber are, the better the textile processing the product quality. In the influence of fiber density on the wearability of fabrics, the fabrics made of finer fibers are softer have softer luster. The fabrics made of finer fibers can be lighter thinner, also can be made of clothing fabrics with good air permeability silk like effect. But the fine fiber fabric is easy to pilling, while the coarse fiber fabric can be used to make stiff, rough thick fabric.
Similarly, the length of textile fiber is closely related to textile product quality. Long fiber length, good length uniformity less short fiber content are beneficial to textile processing product quality. Under the same conditions, if the fiber is long, the yarn strength is high, the sliver is even, the yarn surface is bright clean, the fabric has good fastness, bright clean appearance, is easy to pilling. In addition, on the premise of ensuring a certain yarn quality, the longer the fiber is, the finer the yarn can be spun, which can be used to make lighter thinner fabrics. For short length, length is more important than linear density, for example, in cotton grade pricing, length is the most important indicator.
In textile fibers, the linear density length of natural fibers are uniform, sometimes the difference is still large, it varies with fiber varieties, growth conditions so on. The chemical fiber is manufactured manually. The linear density length of the fiber can be controlled determined artificially according to the requirements of fiber processing use within a certain range.
bulk yarn Bulky yarn is made up of two kinds of fibers with different shrinkage, then the yarn is put into steam hot air boiling water for treatment. At this time, the fibers with high shrinkage produce larger shrinkage, which is located in the center of the yarn, while the mixed fibers with low shrinkage are squeezed on the surface of the yarn to form a circle due to their small shrinkage, so as to obtain bulky, full elastic bulky yarn Yarn.
The core spun yarn is usually made of synthetic fiber filament with good strength elasticity as the core, short fibers such as cotton, wool viscose fiber are twisted together. The core spun yarn has the excellent properties of both filament core spun yarn wrapped short fiber. The more common core spun yarn is the polyester cotton core spun yarn, which takes the polyester filament as the core yarn wraps the cotton fiber. There are also spandex core spun yarn, which is made of spandex filament as the core yarn other fibers. Knitted fabric jeans made of this core spun yarn can stretch freely fit comfortably when wearing.
Linear density of fibers yarns
Linear density is one of the most important physical geometric characteristics of fiber. It only affects the textile processing product quality, but also is closely related to the wearability of fabric. Similarly, linear density is also the most important index of yarn. The linear density of yarn affects the physical mechanical properties, hand feel style of textiles. It is also one of the important basis for fabric design.
There are many ways to express the linear density of fiber yarn, which are usually expressed by indirect index proportional to the cross-sectional area of yarn. Commonly used indicators include tex (number), metric number, English number, Dan number, etc. Generally speaking, the linear density index of fiber yarn can be divided into fixed length system fixed weight system.
Fixed length fixed length system refers to the weight of a certain length of fiber yarn. The larger its value is, the coarser the fiber yarn is. At present, the commonly used ones are tex, dtex, MTeX, Dan (d), etc. The legal unit of measurement in China is the special number system.
Tex is referred to as "tex", which refers to the weight grams of 1000m long fiber yarn at a constant moisture regain. Tex is commonly known as the number for cotton yarn.
In addition, the linear density of yarn can be expressed by diameter. The diameter of yarn is an important basis for fabric design manufacturing process parameters. It can be measured under a microscope, but in actual production, the diameter of yarn is obtained the conversion of the specific number count of yarn the density of yarn.
In the linear density representation of strand, the special number system is expressed by multiplying the single yarn special number of the strand by the composite number, such as 14 × 2. When the characteristics of single yarn in the strand are different, it is expressed by adding the characteristics of single yarn, such as 16 + 18. The count system is expressed by dividing the number of single yarns that make up the strand by the number of strands, such as 50 / 2. If the number of single yarns that make up the strand is different, the number of single yarns should be juxtaposed slashed with diagonal lines, such as 24 / 48.
The linear density of multifilament of chemical fiber is expressed by the number of monofilament total tex. For example, 16.5 tex / 30 f indicates that the density of multifilament bus is 16.5 tex the number of single wires is 30. The linear density of the multifilament of the chemical fiber silk is the sum of the linear density of the monofilament that makes up the multifilament.