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, while also partially alleviating today’s problems of resource scarcity and damage to the natural environment.
Because regenerated cellulose fiber has the dual performance advantages of natural cellulose fiber and synthetic fiber, it is being used in unprecedented ways The scale of use is widely used in textiles.
Today we will take a look at the differences between the three most common fibers: viscose fiber, modal fiber, and lyocell fiber.
01 Ordinary viscose fiber
Viscose, the full name of viscose, is a cellulose fiber obtained by extracting and reshaping fiber molecules from natural wood cellulose using “wood” as the raw material.
The preparation method is to alkalize plant cellulose to form alkali cellulose, and then mix it with carbon disulfide The action generates cellulose xanthate, and the viscous solution obtained by dissolving it in dilute alkali solution is called viscose. The viscose is made into viscose fiber after wet spinning and a series of processing procedures.
The unevenness of the complex molding process of ordinary viscose fiber will make the The cross section is waist-round or irregular, with holes inside and irregular grooves longitudinally. Viscose has excellent hygroscopicity and dyeability, but its modulus and strength are low, especially the wet strength.
02 Modal fiber
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 ordinary viscose fiber. It has the disadvantages of low strength and low modulus in the wet state, but it also has high strength and modulus in the wet state, so it is often called high wet modulus viscose fiber.
Similar products from different fiber manufacturers also have different names, such as Austrian Lenzing Company’s ModalTM brand fiber (Lenzing ModalTM), glass Nosik fiber (Polynosic), Fuqiang Fiber, tiger kapok and Newal (Newal) and other product names.
Preparation method The acquisition of high wet modulus performance is endowed by the special process of the production process of. The differences from the general viscose fiber production process are: (1) Cellulose should have a high average degree of polymerization (about 450). (2) The prepared spinning solution has a higher concentration. (3) Prepare appropriate coagulation bath composition (such as increasing the content of zinc sulfate), and lower the coagulation bath temperature to slow down the molding speed, which is beneficial to obtaining fibers with dense structure and high crystallinity. The inner and outer layers of the fiber obtained in this way have a relatively uniform structure. The sheath-core structure of the fiber cross-section is not as obvious as that of ordinary viscose fibers. The cross-sectional shape tends to be round or waist-round, and the longitudinal surface is also smooth. The fiber is in the wet state. It has high strength and modulus, and its excellent hygroscopic properties are also suitable for underwear. The structure of the inner and outer layers of the fiber is relatively uniform. The sheath-core structure of the fiber cross-section is not as obvious as that of ordinary viscose fibers. The cross-sectional shape tends to be round or waist-round, and the longitudinal direction is smoother. It has higher strength and modulus in the wet state, and has hygroscopic properties. Excellent.
03 Lyocell fiber
Lyocell fiber is made of natural cellulose polymer and is a kind of man-made cellulose fiber. It was invented by the British Courtall Company and later produced by the Swiss Lenzing Company. The trade name is Tencel. The trade name in my country adopts its homophonic “Tencel”.
Preparation method Lyocell is based on N-methyl morphine oxide (NMMO) aqueous solution As a solvent, cellulose pulp can be directly dissolved to obtain a spinning solution, and then a wet spinning or dry-wet spinning method can be used to shape the fiber using a certain concentration of NMMO-H2O solution as a coagulation bath, and then the spun fiber can be A new type of cellulose fiber made from virgin fibers by stretching, washing, oiling and drying.
Compared with conventional viscose fiber production methods, this spinning method has the largest The advantage is that NMMO can directly dissolve cellulose pulp, the production process of spinning dope can be greatly simplified, and the recovery rate of NMMO can reach more than 99%, and the production process hardly pollutes the environment. The morphological structure of Lyocell fiber is completely different from that of ordinary viscose.The surface structure is uniform and round, and there is no distinction between skin and core layers. The longitudinal surface is smooth and has no grooves. It has better mechanical properties than viscose fiber and good dimensional stability in water washing (shrinkage is only 2%). Higher hygroscopicity. Beautiful luster, soft hand feel, good drape, and good elegance.
Viscose, modal, The difference between Lyocell
1 Fiber cross section
2 Fiber Characteristics
Viscose fiber
has Good hygroscopicity, in line with the physiological requirements of human skin, the fabric is soft, smooth, good air permeability, not easy to generate static electricity, anti-ultraviolet, comfortable to wear, easy to dye, bright color after dyeing, good color fastness, good spinnability performance. The wet modulus is low, the shrinkage is high and it is easy to deform. It feels hard after being put into water, and has poor elasticity and wear resistance.
Modal fiber
Soft to the touch , smooth, bright color, good color fastness, the fabric feels particularly smooth, the cloth surface is bright, the drape is better than the existing cotton, polyester, and viscose fiber, it has the strength and toughness of synthetic fibers, and has a silk-like texture It has good gloss and feel, its fabric is wrinkle-resistant and non-ironing, and has good water absorption and air permeability, but its fabric has poor stiffness.
Lyocell fiber
It has many excellent properties of natural fibers and synthetic fibers, with natural luster, smooth feel, high strength, basically no shrinkage, good moisture and air permeability, softness, comfort, smoothness and coolness, good drape, and durability.
3 Scope of application
Sticky Viscose fiber
Short fiber can be spun purely or blended with other textile fibers. It is suitable for making underwear, outerwear and various decorative items. The filament fabric is light and thin. In addition to being suitable for clothing, it can also be used to weave quilts and decorative fabrics.
Modal fiber
Modal Knitted fabrics are mainly used to make underwear, but also used in sportswear, casual wear, shirts, high-end ready-to-wear fabrics, etc. Blending with other fibers can improve the shortcomings of poor stiffness of pure Modal products
Saier Fiber
covers all fields of textiles, whether it is cotton, wool, silk, linen products, or knitting or woven products, it can produce high-quality and high-end products. </p
