In recent years, regenerated cellulose fibers (such as viscose, Modal, Tencel, and other fibers) have continued to appear, meeting people's needs in a timely manner, and partially alleviating the current resource shortage and the destruction of the natural environment. Because regenerated cellulose fiber has the dual performance advantages of natural cellulose fiber and synthetic fiber, it is being widely used in textiles on an unprecedented scale.
Today we take a look at the difference between viscose fiber, modal fiber and lyocell fiber.
Viscose is the full name of viscose fiber. It is a cellulose fiber obtained by extracting and reshaping fiber molecules from natural wood cellulose using "wood" as the raw material. The preparation method alkalizes plant cellulose to form alkali cellulose, and then reacts with carbon disulfide to generate cellulose xanthate. The viscous solution obtained by dissolving in dilute alkali solution is called viscose. After a series of treatment processes, viscose fiber is formed.
How to produce viscose?
The unevenness of the complex forming process of Viscose will make the cross-section of conventional viscose fiber be round or irregular, with holes inside and irregular grooves in the longitudinal direction. Viscose has excellent moisture absorption and dyeability, but its modulus and strength are low, especially the wet strength.
Features of Viscose
It has good moisture absorption and meets the physiological requirements of human skin. The fabric is soft, smooth, air-permeable, resistant to static electricity, anti-ultraviolet, comfortable to wear, easy to dye, bright color after dyeing, good color fastness, and good performance. Spinning performance. The wet modulus is low, the shrinkage rate is high, and it is easy to deform. After launching, it feels hard and has poor elasticity and wear resistance.
Use of Viscose
Short fibers can be spun purely or blended with other textile fibers, suitable for making underwear, outerwear and various decorative articles. The filament fabric is light and thin, and it can be used for weaving quilts and decorative fabrics besides being suitable for clothing.
Modal fiber is the trade name of high wet modulus viscose fiber. The difference between it and ordinary viscose fiber is that Modal fiber improves the shortcomings of low strength and low modulus of ordinary viscose fiber in the wet state. It also has higher strength and modulus in the state, so it is often called high wet modulus viscose fiber.
Similar products from different fiber manufacturers have different titles, such as Lenzing ModalTM brand fiber, Polynosic fiber, Fuqiang fiber, Tiger Kapok and Newal from Austrian Lenzing .
How to produce modal?
Preparation method The high wet modulus performance is obtained by the special process of the production process. The difference from the general production process of viscose fiber is: (1) Cellulose should have a higher average degree of polymerization (about 450). (2) The prepared spinning dope has a higher concentration. (3) Adjust the appropriate composition of the coagulation bath (such as increasing the content of zinc sulfate), reduce the temperature of the coagulation bath, and delay the forming speed, which is beneficial to obtain fibers with dense structure and high crystallinity. The inner and outer layer structure of the fiber obtained in this way is relatively uniform. The core layer structure of the fiber cross-section is not as obvious as that of ordinary viscose fiber. The cross-sectional shape tends to be round or waist round, and the longitudinal surface is relatively smooth. The fiber is in the wet state. It has higher strength and modulus, and excellent moisture absorption performance is also suitable for underwear. The fiber inner and outer layer structure is relatively uniform, the fiber cross-section of the skin core layer structure is not as obvious as ordinary viscose fiber, the cross-sectional shape tends to be round or waist round, the longitudinal direction is smoother, and the wet state has higher strength and modulus, and moisture absorption performance Excellent.
Features of Modal
Soft touch, bright and clean, bright color, good color fastness, the fabric feels particularly smooth, the cloth surface is bright, drape is better than the existing cotton, polyester, viscose, it has the strength and toughness of synthetic fiber, and has silk General luster and hand feeling, its fabric has wrinkle resistance and non-ironing property, good water absorption and air permeability, but its fabric has poor stiffness.
Use of Modal
Modal's knitted fabrics are mainly used for making underwear, but also for sportswear, casual wear, shirts, high-end garment fabrics, etc. Blending with other fibers can improve the shortcomings of poor crispness of pure modal products.
Lyocell fiber is a kind of man-made cellulose fiber with natural cellulose polymer as raw material. It was invented by the British Koutauer Company, and later transferred to the Swiss Lenzing Company, under the trade name Tencel. Preparation method Lyocell uses NMMO aqueous solution as the solvent, which can directly dissolve the cellulose pulp to obtain the spinning solution, and then adopt wet spinning or dry-wet spinning method, and use a certain concentration of NMMO-H2O solution as coagulation A new type of cellulose fiber is made by forming the fiber in a bath, and then stretching, washing, oiling, and drying the spun nascent fiber.
Features of Tencel
It has a variety of excellent properties of natural fiber and synthetic fiber, natural luster, smooth hand, high strength, basically no shrinkage, good moisture permeability, good air permeability, soft, comfortable, smooth and cool, good drape, durable and durable.
Use of Tencel
Covering all fields of textiles, whether it is cotton, wool, silk, linen products, or knitting or weaving fields, high-quality and high-end products can be produced.