Can’t tell the difference between viscose, modal and lyocell?

In recent years, regenerated cellulose fibers (such as viscose, Modal, Tencel and other fibers) have continued to appear, timely meeting people’s needs, and at the same time partially alleviating the current shortage of resources and the impact 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 most common viscose fibers, What is the difference between modal fiber and lyocell fiber?

Ordinary viscose fiber

Viscose, the full name of viscose fiber, uses “wood” as the raw material, extracts and reshapes fiber molecules from natural wood cellulose The resulting cellulose fiber.

Preparation method

Plant cellulose It is alkalized to form alkali cellulose, and then reacts with carbon disulfide to form cellulose xanthate. The viscous solution obtained by dissolving in dilute alkali solution is called viscose. The viscose is produced after wet spinning and a series of processing steps. Viscose fiber.

The unevenness of the complex molding process of ordinary viscose fibers will cause the cross-section of conventional viscose fibers to be round or irregular, with holes inside and irregular grooves in the longitudinal direction. . Viscose has excellent hygroscopicity and dyeability, but its modulus and strength are low, especially the wet strength.

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 the wet state of ordinary viscose fiber. It has the disadvantages of low strength and low modulus under wet conditions, 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 have different names, such as Austrian Lenzing The company’s ModalTM brand fiber (Lenzing ModalTM), glass Nosik fiber (Polynosic), Fuqiang fiber, tiger kapok and Newal (Newal) and other product names

Preparation method

High wet modulus performance is obtained by Given by the special craftsmanship of the production process. What is different from the general viscose fiber production process is:

(1) Cellulose should have a high average degree of polymerization (about 450).

(2) Prepared The spinning dope has a higher concentration.

(3) Deploy accordingly Appropriate coagulation bath composition (such as increasing the zinc sulfate content), lowering the coagulation bath temperature, and slowing down the molding speed are beneficial to obtaining fibers with a 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 fiber. The cross-sectional shape tends to be round or waist-round, and the longitudinal direction is smooth. There is High strength and modulus, excellent hygroscopic properties.

Lyocell fiber

lyocell The fiber is made of natural cellulose polymer and is a kind of man-made cellulose fiber. It was invented by the British Cotauer 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 uses N-methylmorphine oxide (NMMO) aqueous solution as the solvent, which can directly convert cellulose pulp into Dissolve to obtain a spinning solution, and then use wet spinning or dry-wet spinning method to add a certain concentration of NMMO-H₂O solution is used as a coagulation bath to shape the fibers, and then the spun fibers are stretched, washed, oiled and dried to obtain a new type of cellulose fiber.

Compared with the conventional viscose fiber production method, this spinning method The biggest advantage is that NMMO can directly dissolve cellulose pulp, and the production process of spinning dope can be greatly simplified. The recovery rate of NMMO can reach more than 99%, and the production process hardly pollutes the environment.

Lyocell fiber morphology and structure are completely different from ordinary viscose. The cross-sectional 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 performance than viscose. The fiber has excellent mechanical properties, good dimensional stability in water washing (shrinkage is only 2%), and high hygroscopicity. Beautiful luster, soft hand feel, good drape, and good elegance.

The difference between viscose, modal and lyocell

1 fiber section

2 Fiber Characteristics

Viscose

has good hygroscopicity and meets the physiological requirements of human skin. The fabric is soft, smooth, breathable and not easy to flake. Static, anti-ultraviolet, comfortable to wear, easy to dye, bright color, good color fastness after dyeing, and good spinnability. 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 touch, smooth, bright color, good color fastness, the fabric feels particularly smooth, the cloth surface is bright, and the drape is better than existing cotton , polyester and viscose are good, with the strength and toughness of synthetic fibers, silk-like luster and feel, the fabric is wrinkle-resistant and non-ironing, has good water absorption and breathability, but the fabric has poor stiffness.

lyocell fiber

Has a variety of excellent properties of natural fibers and synthetic fibers, with natural luster, smooth feel, high strength, basically no shrinkage, good moisture and air permeability, soft, comfortable, smooth and cool, good drape, and durable. .

3 Scope of application

Viscose fiber

Short fibers can be spun purely or blended with other textile fibers, suitable for Make 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

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