After stretching, the filaments are treated with various finishing chemicals to improve dye absorption, softness, and dimensional stability. The critical step occurs when the aged cellulose is reacted with carbon disulfide, forming cellulose xanthate.
The Viscose Rayon Manufacturing Process: From Cellulose to Finished Filaments
Sulfuric Acid Spinning The viscose solution, now a thick syrup, is carefully extruded through a spinneret into a bath of dilute sulfuric acid. Understanding how is viscose made reveals a complex process that bridges sustainable botany and intensive chemical engineering, making it a cornerstone of the modern textile industry.
While technically a subset of viscose production, Lyocell uses a non-toxic amine oxide solvent in a closed-loop system that recycles nearly all chemicals. Wood pulp, often from fast-growing trees like pine or beech, is the primary feedstock.
Step-by-Step Viscose Rayon Manufacturing Process
The pulp is mechanically or chemically treated to remove lignin and hemicellulose, leaving behind nearly pure cellulose. Viscose, often referred to as rayon, occupies a unique space in the world of textiles.
More About How is viscose made
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