Fiber introduction　　

Viscose fiber is the full name of viscose fiber. It is divided into viscose filament and viscose staple fiber.

　　 viscose fiber-also called rayon, ice silk, viscose filament. In recent years, a new high-end variety of viscose fiber called Tencel and bamboo fiber has appeared. Viscose fiber is a cellulose fiber produced from cotton or other natural fibers. Among the 12 main textile fibers, the moisture content of viscose fiber is the most suitable for the physiological requirements of human skin. It has the characteristics of smoothness, coolness, air permeability, antistatic, and colorful dyeing.

　　 viscose fiber is a regenerated cellulose fiber. It uses natural cellulose as raw material to make soluble cellulose xanthate through alkalization, aging, yellowing and other processes, then dissolve it in dilute lye to make viscose, and make it by wet spinning. Using different raw materials and spinning processes, ordinary viscose fiber, high wet modulus viscose fiber and high-strength viscose fiber can be obtained respectively. Ordinary viscose fiber has general physical and mechanical properties and chemical properties, and is divided into cotton type, wool type and filament type, commonly known as rayon, artificial wool and rayon. High wet modulus viscose fiber has a higher degree of polymerization, strength and wet modulus. This kind of fiber can withstand a load of 22.0cN per unit linear density in the wet state, and the wet elongation under this load does not exceed 15%, and it mainly contains rich and strong fibers. High-strength viscose fiber has high strength and fatigue resistance.

Fiber History　　

Viscose fiber is one of the ancient fiber varieties. In 1891, Cross, Bevan, and Beadle first made a sodium cellulose xanthate solution using cotton as a raw material. Because of the high viscosity of this solution, it was named " Viscose". After the viscose encounters acid, the cellulose re-precipitates. Based on this principle, it was developed in 1893 as a method of manufacturing cellulose fibers, which is called "viscose fibers". By 1905, Muller and others invented a coagulation bath composed of dilute sulfuric acid and sulfate, realizing the industrial production of viscose fiber.

Fiber characteristics　　

The basic composition of viscose fiber is cellulose (C6H10O5)n o Ordinary viscose fiber has a zigzag-shaped skin-core structure in cross section, with straight and horizontal grooves in the longitudinal direction. The fiber-rich structure without skin core has a circular cross-section.

　　 viscose fiber has good hygroscopicity, under normal atmospheric conditions, the moisture regain rate is about 13%. After absorbing moisture, it expands significantly, and the diameter increases by up to 50%, so the fabric feels hard and has a large shrinkage rate after being put into the water.

The breaking strength of ordinary viscose fiber is smaller than that of cotton, about 1.6~2.7cN/dtex; the elongation at break is greater than that of cotton, which is 16%~22%; the wet strength decreases more, about 50% of the dry strength, and the wet stretch The length increases by about 50%. Its modulus is lower than that of cotton, it is easy to deform under a small load, and its elastic recovery performance is poor, so the fabric is easy to stretch and its dimensional stability is poor. The strength of the rich fiber, especially the wet strength, is higher than that of ordinary viscose, the elongation at break is smaller, and the dimensional stability is good. Ordinary viscose has poor abrasion resistance, while rich fiber has improved.

The chemical composition of 　　 viscose fiber is similar to cotton, so it is more alkali-resistant but not acid-resistant, but it is inferior to cotton. Rich fiber has good alkali resistance and acid resistance. Similarly, the dyeability of viscose fiber is similar to cotton, the dyeing chromatogram is complete, and the dyeing performance is good. In addition, the thermal properties of viscose fiber are similar to cotton, and the density is close to that of cotton, which is 1.50~1.52g/cm3.

Application area　　

Viscose fiber is one of the first chemical fibers put into industrial production. Because of its good moisture absorption, comfortable wearing and excellent spinnability, it is often blended or interwoven with cotton, wool or various synthetic fibers, and used in various clothing and decorative textiles. High-strength viscose fiber can also be used for industrial products such as tire cords and conveyor belts. Viscose fiber is a widely used chemical fiber.

Main species　　

1. Ordinary viscose fiber:

　　 (1) Viscose cotton staple fiber cut length 35~40mm, fineness 1.1~2.8dtex (1.0~2.5 denier) blended with cotton can be used for fine cloth, validin, gabardine, etc.

        (2) Viscose wool type staple fiber, cut length 51~76mm, fineness 3.3~6.6dtex (3.0~6.0 denier), can be pure spinning, can also be blended with wool, can be used for tweed, overcoat, etc.

2. Rich and strong fiber:

　　 (1) is an improved variety of viscose fiber.

　　 (2) Pure spinning can be made into muslin, poplin, etc.

　　 (3) Blended with cotton, polyester, etc., to produce various garments.

　　 (4) Good alkali resistance, woven fabrics are stiff, will not shrink or deform after washing, and are more durable and durable.

3. Viscose wire:

　　 (1) Can be used for clothing, quilt, bedding and decorations.

　　 (2) Viscose silk and cotton yarn are interwoven, which can be used as feather yarn and thread quilt.

　　 (3) Viscose silk is interwoven with silk, which can be used as georgette, brocade, etc.

　　 (4) The viscose thread is interwoven with polyester and brocade filaments, which can be used as crystal satin, antique satin, etc.

4. Strong viscose yarn:

　　(1) The strength is twice as high as that of ordinary viscose yarn.

　　 (2) Twisted and woven into cord fabric, which is used in automobile, tractor, and carriage tires.