In the textile industry, polyester (polyester fiber) and viscose (man-made cellulose fiber) are two common synthetic and regenerated fiber fabrics. They differ significantly in their raw material sources, physical properties, and applications.
Raw Materials and Production Process
Polyester is a downstream product of the petrochemical industry. It is produced by polymerizing terephthalic acid and ethylene glycol to form polyester chips, which are then melt-spun. It is a completely synthetic chemical fiber. Viscose, on the other hand, is made from natural cellulose fibers such as wood and cotton linters. After chemical treatments such as alkalization and sulfonation, it is dissolved and spun into a regenerated cellulose fiber, retaining some of the properties of natural fibers.
Physical Property Comparison
Polyester's outstanding characteristics are high strength, abrasion resistance, and wrinkle resistance. Its dense fiber structure resists deformation, and it offers excellent chemical stability, resistance to acids, alkalis, and sunlight. However, polyester has poor moisture absorption (a moisture regain of only approximately 0.4%), is prone to static electricity, and offers limited comfort. In contrast, viscose has excellent moisture absorption (a moisture regain of 13%-15%), breathability close to that of cotton, and a soft, smooth feel, making it suitable for intimate apparel. However, viscose has low wet strength, easily shrinks and deforms after being used in water, and poor abrasion resistance, making it less durable than polyester.
Functions and Applications
Due to its durability and easy care, polyester is widely used in sportswear, outdoor equipment, home textiles (such as curtains and sofa fabrics), and industrial applications (such as tire cord). Viscose, on the other hand, is commonly used in comfortable apparel such as shirts, dresses, and underwear due to its skin-friendly feel and drapeability. It is also often blended with cotton and linen to improve the fabric's feel. Furthermore, viscose has excellent dyeing properties, resulting in brighter colors than polyester.
Environmental and Cost Differences
From a sustainability perspective, although viscose is derived from natural cellulose, its production requires a large amount of chemicals, which can cause pollution. While polyester is a petrochemical product, it is recyclable, and modern processes are gradually reducing energy consumption. In terms of cost, polyester is generally cheaper than viscose due to its stable raw material source.
In summary, polyester and viscose each have their advantages, and the choice should be made based on specific needs, weighing performance, comfort, and usage scenarios.
